Search

Based on the mixed ligands of 1,4‐bis(2,4,6‐tricarboxylpyrid‐5‐yl)benzene (H6BTPB) and 1,4‐bis(imidazol‐1‐yl)benzene (bib), a new cadmium(II) coordination polymer with the molecular formula of {[Cd(bib)(μ2‐H2O)(H2O)2](H4BTPB)0.5(bib)0.5}n (CdCP) was constructed under solvothermal condition, and displayed a 3D supramolecular structure expanded by the hydrogen bonds between the 1D [Cd(bib)(μ2‐H2O)(H2O)2]n ladder chain and the guests. Profiting from its superior stability and inherent luminescence, the prepared CdCP dispalyed great potential as a highly sensitive and selective luminescent sensor in trace detection of 3‐NT biomarker in both water and real bodily fluids through the luminescence quenching effects, with the Ksv and LODs being 2.408×105 M−1 and 30.3 nM in water, 2.230×105 M−1 and 44.7 nM in diluted urine, 2.249×105 M−1 and 43.9 nM in diluted serum, respectively. Subsequent mechanism studies indicated the synergistic effect of internal filtering effect, photo‐induced electron transfer, and fluorescence resonance energy transfer determining the luminescence quenching response of CdCP towards 3‐NT biomarker. [ABSTRACT FROM AUTHOR]

Two isostructural rare earth metal–organic frameworks, namely [Re2(BBTC)(DMF)5Cl2]·2DMF·H2O [BBTC4– = 1,1'-butadiynebenzene-3,3',5,5'-tetracarboxylate, Re = Y (1) and Ho (2)], have been prepared via solvothermal reaction. Single crystal X − ray analyses reveal that complexes 1 and 2 both crystallize in the P21/m space group. Topological analyses suggest that these frameworks possess the same two–dimensional (2D) (4,4)-connected networks. Notably, the emission spectrum reveals the fluorescence of complex 1 is mainly from the ligands to ligands charge transfer transition. Further investigation indicates that complex 1 can act as a fluorescent sensor for highly sensitive and selective detection of Fe3+ and 2,4,6-trinitrophenol (TNP) in MeCN solution, the quenching constants (Ksv) are 1.45 × 105 M−1 for Fe3+ and 4.08 × 104 M−1 for TNP, with the detection limit (LOD) of 0.12 µM for Fe3+ and 0.52 µM for TNP. Furthermore, the possible sensing mechanisms of complex 1 as bifunctional sensors have been studied based on experiments. Two isostructural rare earth metal–organic frameworks based on 1, 1'−butadiynebenzene−3, 3', 5, 5'−tetracarboxylate ligand were synthesized and structurally characterized in detail, and complex 1 is promising bifunctional luminescent probe for highly sensitive and selective sensing Fe3+ ions and TNP through luminescence quenching effect, complex 1 also exhibits good recyclability for detecting Fe3+ ions and TNP. The quenching mechanisms were studied as well. [ABSTRACT FROM AUTHOR]

A coordination polymer (CP) based on Co(II), {[Co(Ox)(H2O)3] · 2H2O}n (KA@CP2_ARS), has been synthesized using 1,3,5-tris[(1H-imidazol-1-yl)methyl]benzene (Timb) and potassium oxonate (OxK) at room temperature which was examined by single-crystal X-ray diffraction. KA@CP2_ARS contains a one-dimensional (1-D) helical chain that is extended through hydrogen-bonding interactions to form two-dimensional (2-D) and three-dimensional (3-D) supramolecular networks. KA@CP2_ARS demonstrates highly selective luminescent performance for IPA, Co2+, MnO4–, and uric acid with detection limits of 0.214, 0.16, 0.076, and 0.65 ppm, respectively, among the screened analytes. KA@CP2_ARS displays strong photocatalytic activities for degrading 88.6% of methyl violet dye under ultraviolet irradiation. [ABSTRACT FROM AUTHOR]

Two Cd(II) MOFs based on the 1,4-bis[(2-methyl-1H-imidazol-1-yl)-methyl]benzene (1,4-mbix) and succinate (Suc2−) or azelate (Aze2−) ligands have been hydrothermally synthesized, namely, {[Cd2(Suc)2(1,4-mbix)2]·5H2O}n (1) and [Cd(Aze)(1,4-mbix)]n (2). Both MOFs were structurally characterized by single-crystal X-ray diffraction. In MOF 1, the Cd(II) centers are connected by Suc2− and 1,4-mbix to generate a two-dimensional (2D) sql layer with (H2O)5 water cluster. Each 2D layer is further interlocked with two adjacent layers to form a 2D + 2D → 3D parallel polycatenated structure. In MOF 2, when the Suc2− was placed by Aze2−, the Cd(II) centers are connected by Aze2− and 1,4-mbix into a 2D sql layer but without any water molecules. And two 2D sql layers interpenetrate with each other to generate a twofold 2D + 2D → 2D sheet. MOFs 1 and 2 display photoluminescence at 343 nm (λex = 288 nm) and 298 nm (λex = 271 nm), respectively. Luminescent quenching experiments show that 1 and 2 have good ability for detection of Fe3+ in deionized water with low detection limits as 0.58 μM for 1 and 0.54 μM for 2, respectively. Two MOFs also can serve as luminescent sensors for Fe3+ in real tap water and river water. The luminescent quenching of 1 and 2 toward Fe3+ can be attributed to the competition among the absorption of Fe3+ with the excitation and emission of two MOFs. [ABSTRACT FROM AUTHOR]

In this paper, a new three-dimensional network coordination polymer {[Co(TPTC)(HBPDPE)2·2H2O]·3H2O}n [[[(1:1′:4′,1″-terphenyl)-3,3″,5,5″-tetracarboxylic cobalt (II)] dipyridine dihydrate] trihydrate] (Complex 1) was generated under solvothermal synthesis by rigid conjugated ligand H4TPTC ([1:1′:4′,1″-terphengl]-3,3″,5,5″-tetracarboxylic), V-shaped BPDPE (4,4′-bis (pyridyl) diphenyl ether) and Co(II) ion. In complex 1, the neighboring Co(II) ions are linked by deprotonated TPTC4- to achieve a 1D zigzag chain [Co(TPTC)(HBPDPE)2]n, then the adjacent [Co(TPTC)(HBPDPE)2]n chains linked each other by various H-bondings to extend the structure from 1D chain to 3D network. Complex 1 has excellent fluorescence sensing performance and exhibits high sensitivity and selectivity for detecting 2,4,6-trinitrophenol (TNP), the quenching constant Ksv is up to 2.08 × 105 M−1 along with the correlation coefficient R2 of 0.993. Furthermore, the quench mechanisms of this Co-MOF as a sensor to detect nitro- aromatic explosives were studied as well. A new three-dimensional coordination polymer {[Co(TPTC)(HBPDPE)2·2H2O]·3H2O}n (1), constructed by 1D zigzag chains and H-bondings interactions, was synthesized under solvothermal condition by a rigid conjugated ligand H4TPTC ([1:1′:4′,1″-terphengl]-3,3″,5,5″-tetracarboxylic), BPDPE (4,4′-bis (pyridyl) diphenyl) and Co(II) ion. Complex 1 has excellent fluorescence sensing performance for detecting Nitroaromatic explosive (NAE) 2,4,6-trinitrophenol (TNP), the quenching constant Ksv is up to 2.08 × 105 M−1, and the quenching mechanism was studied as well. [ABSTRACT FROM AUTHOR]

Encapsulated fluorescent dyes DMASM and RhB into different In-MOFs frameworks, diverse luminescent dye@MOF platforms were constructed, demonstrating enhanced selectivity and sensitivity for detecting antibiotics. [Display omitted] • Four diverse luminescent dye@MOF platforms (DMASM@1/2 and RhB@1/2) were constructed. • Four dye@MOF materials were utilized for antibiotic detection of different kinds, demonstrating enhanced selectivit/sensitivity. • The exploration of mechanism revealed the effective and adjustable energy transfer and interaction between frameworks and dye molecules. • Four dye@MOF materials demonstrated great potential for practical applications in antibiotic detection. The fabrication of luminescent dye@MOF composites has received extensive attentions in the development of realistic sensing applications. Herein, based on two anionic In-MOFs with different pore structure (1 and 2), the charge and size dependent ion-exchange of cationic dyes was investigated, and consequently four luminescent dye@MOF composites (DMASM@1/2 and RhB@1/2) were successfully fabricated and importantly can be regarded as ideal platforms for better understanding of the factors affecting the construction of dye@MOF composites, which may closely related to a well match between the intrinsic properties and size/charge of the fluorescent molecules and the porosity, structure character of the MOF hosts. Furthermore, these four dye@MOF composites were utilized for sensing of different kinds of antibiotics, demonstrating enhanced selectivity and sensitivity. DMASM@1/2 demonstrated excellent selectivity and sensitivity for NFT and NFZ antibiotics, while RhB@1/2 exhibited excellent selectivity and sensitivity for MDZ and DTZ antibiotics. Systematic analysis of the detection mechanism revealed that different energy transfer efficiency and interaction between MOF frameworks and different types of guest dyes led to different selectivity and detection mechanisms for antibiotics. Moreover, high selectivity and sensitivity, low LOD and extraordinary recycling capacity of four dye@MOF composites in the detection of antibiotics promote their excellent prospect in the further practical application. [ABSTRACT FROM AUTHOR]

The work presented herein reports on the synthesis, structural and physico-chemical characterization, luminescence properties and luminescent sensing activity of a family of isostructural coordination polymers (CPs) with the general formula [Ln2(μ4-5Meip)3(DMF)]n (where Ln(III) = Sm (1Sm), Eu (2Eu), Gd (3Gd), Tb (4Tb) and Yb (5Yb) and 5Meip = 5-methylisophthalate, DMF = N,N-dimethylmethanamide). Crystal structures consist of 3D frameworks tailored by the linkage between infinite lanthanide(III)-carboxylate rods by means of the tetradentate 5Meip ligands. Photoluminescence measurements in solid state at variable temperatures reveal the best-in-class properties based on the capacity of the 5Meip ligand to provide efficient energy transfers to the lanthanide(III) ions, which brings intense emissions in both the visible and near-infrared (NIR) regions. On the one hand, compound 5Yb displays characteristic lanthanide-centered bands in the NIR with sizeable intensity even at room temperature. Among the compounds emitting in the visible region, 4Tb presents a high QY of 63%, which may be explained according to computational calculations. At last, taking advantage of the good performance as well as high chemical and optical stability of 4Tb in water and methanol, its sensing capacity to detect 2,4,6-trinitrophenol (TNP) among other nitroaromatic-like explosives has been explored, obtaining high detection capacity (with Ksv around 105 M−1), low limit of detection (in the 10−6–10−7 M) and selectivity among other molecules (especially in methanol). [ABSTRACT FROM AUTHOR]

A water-stable Zn-MOF was constructed based on H2PBA and 1, 10-phenanthroline under solvothermal conditions. The compound exhibited a 3D (2,3,8)-connected (43)2(46.66.815.12)(8) topology framework. The crystal structure and phase purity of the compound was verified by single crystal X-ray diffraction. Subsequently, some studies on the morphology, structure, and luminescent properties were carried out. The results showed that this compound could be used as a versatile chemosensor for Fe3+/Cu2+, trinitrophenol and colchicine via a luminescence quenching effect in an aqueous medium. [ABSTRACT FROM AUTHOR]

[Display omitted] • Developing a novel sensor to detect flunitrazepam based on luminescence Eu-MOF. • Eu-MOF is used for the first time in the detection of flunitrazepam. • This luminescence sensor is highly sensitive to flunitrazepam, with a LOD of 73 nM. • This sensor exhibits excellent anti-interference ability in real samples. Flunitrazepam, as an emerging new psychoactive substance classified as a third-generation drug that is more harmful and camouflaged, is gradually proliferating globally. Maliciously used as a criminal tool in homicide and rape cases, it has already caused serious harm to public safety and social stability. Owing to its special molecular structure, low concentration level and rapid metabolic process in the human body, accurate detection of flunitrazepam remains a major challenge, especially for real sample and on-site detection. In this paper, a lanthanide MOF (Eu-MOF) based on bi-ligand was constructed as a luminescence probe and used for the first time to detect trace amounts of flunitrazepam. The 'antenna effect' promotes strong luminescence of Eu-MOF, while the lower LUMO orbital energy level of flunitrazepam allows it to accept electrons from the electron donor leading to quenching of Eu-MOF luminescence. The probe has a high sensitivity and can detect flunitrazepam in the range of 0–800 μM with a detection limit as low as 73 nM. Moreover, flunitrazepam was detected in urine from real samples as well as in a variety of beverages to further validate its accuracy and practicality. The reported Eu-MOF represents one of the pioneering luminescence probes for the detection of flunitrazepam, which offers great promise for the on-site or on-line analysis of flunitrazepam. [ABSTRACT FROM AUTHOR]

• Two new Co(II) CPs show as 3D hydrogen-bonded networks with bnn and (3,4,8)-connected topologies. • Both CPs show as remarkable luminescent sensors for turn-on sensing of Al3+ and turn-off sensing of Pb2+ and VB 2. • Both CPs also can effectively detect Al3+ and Pb2+ in real lake water and VB 2 in serum with high sensitivity. Rational design of coordination polymers (CPs) as luminescent sensors, has attracted great interest in recent years. In this work, two new Co(II) CPs with formula as {[Co(5-AIP)(1,2-Mbix)]·2H 2 O} n (1) and {[Co(5-AIP)(1,3-Mbix)]} n (2) have been synthesized and characterized (5-AIP = 5-aminoisophthalic acid, 1,2-Mbix = 1,2-bis(2-methylimidazole-1-methyl)benzene, 1,3-Mbix = 1,3-bis(2-methylimidazole-1-methyl)benzene). CP 1 features a 3D hydrogen-bonded network with 5-connected (46·64) bnn topology. CP 2 shows a 3D hydrogen-bonded network as a trinodal (3,4,8)-connected topopogy with the symbol of (3·5·7) 2 (32·6·72·8)(32·54·616·84·102). Two CPs both show excellent luminescent property with good stability in water. Both CPs can effectively detect Al3+, Pb2+ and vitamin B 2 (VB 2) in water with limits of detection being 84 nM, 0.10 and 0.17 μ M for CP 1 , 25 nM, 0.09 and 0.29 μ M for CP 2 , respectively. Furthermore, two CPs also can detect Al3+ and Pb2+ in real lake water and VB 2 in serum. The sensing mechanism was investigated by various detection means. The test films of CP 1 and CP 2 were also prepared for the visual detection of Al3+, Pb2+ and VB 2 in water. This work presents two effective Co(II) CPs as the functional platform for sensing Al3+, Pb2+ and VB 2 in aqueous solution. Two new Co(II) CPs of 5-aminoisophthalic acid and bis(2-methylimidazole) ligands are discribed. CPs 1 and 2 display as 3D hydrogen-bonded network with bnn and (3,4,8)-connected topologies. Both CPs were explored as luminescent sensors for effective detection of Al3+ via turn-on effect, Pb2+ and VB 2 via turn-off effect in water. [Display omitted] [ABSTRACT FROM AUTHOR]

Main observation and conclusion: One near‐infrared (NIR) luminescent octanuclear Zn(II)‐Yb(III) complex [Zn6Yb2L4(OAc)2(DMF)EtOH] (1) was obtained from a new multidentate Schiff base ligand. It exhibits interesting luminescent sensing activity to antibiotics, in particular to nitrofuran antibiotics (NFAs) with high sensitivity due to the inner filter effect. The NIR luminescence quenching constants and limits of the detection of the complex towards NFAs are 2.9 × 104—5.5 × 104 L/mol and 1.27—2.38 μmol/L, respectively. Its high luminescence sensitivity to NFAs is not changed with the existence of other antibiotics. [ABSTRACT FROM AUTHOR]

Under solvothermal conditions, two new Zn(II)-based coordination polymers, namely {[Zn(tptc)0.5(2,2′-bpy)]·dioxane}n (1, H4tptc = p-terphenyl-2,2″,5″,5‴-tetracarboxylate acid, 2,2′-bpy = 2,2′-bipyridine) and [Zn(tptc)0.5(bib)]n (2, bib = 1,3-bis((imidazol-1-yl) benzene), have been synthesized using the mixed-ligand approach. Furthermore, the luminescence studies show that complex 2 can test acetylacetone selectively and sensitively, and the detection limit is 1.72 ppm. In addition, we evaluated the compounds therapeutic effect against uterine leiomyomas. The uterine leiomyomas rats model was established, the compound 1 and compound 2 was used for treatment. The detection of the transforming growth factor-β (TGF-β) releasing from endometrial stromal cells into plasma was detected with an enzyme linked immunosorbent assay (ELISA) detection kit. Then, the mmp-3 and mmp-7 relative expression levels in the uterine smooth muscle cells after compound treatment were measured by the reverse transcription-polymerase chain reaction (RT-PCR). [ABSTRACT FROM AUTHOR]

• A new europium metal-organic framework is synthesized and fully characterized. • The MOF has good chemical stability, water stability and high thermal stability. • The MOF is a smart luminescent sensor for NB detection. • The MOF can effectively catalyze CO 2 and epoxides into cyclic carbonates. The employment of metal-organic frameworks (MOFs) as fluorescence sensors for the detection of environmental pollutants and/or heterogeneous catalysts for CO 2 conversion is of great importance for protecting human health. For this purpose, we synthesized a new Eu-MOF [Eu 2 (btpdc) 2 ·(HCOO) 2 ] n (1) (H 2 btpdc = benzo[ b ]thiophene-2,5-dicarboxylic acid) with its three-dimensional structure characterized by single-crystal X-ray diffraction. The powder X-ray diffraction (PXRD) and thermal gravimetric analysis (TGA) results indicate that 1 has high chemical durability, good water stability and high thermal stability. Fluorescence sensing investigations demonstrate that 1 is a smart chemical sensor towards nitrobenzene (NB) detection with high sensitivity, high selectivity and good regeneration performance. A high quenching constant (K sv = 2.33 × 105 M−1) and a low detection limit (LOD = 0.038 μM) are obtained. Combined with experiments and density functional theory calculations, the mechanisms of fluorescence quenching of 1 by NB were also revealed. Furthermore, 1 can serve as a smart catalyst for the cycloaddition reaction of CO 2 with epoxides to synthesize cyclic carbonates, displaying high activity, high selectivity, and good generality. A new three-dimensional Eu-MOF [Eu 2 (btpdc) 2 ·(HCOO) 2 ] n (H 2 btpdc = benzo[b]thiophene-2,5-dicarboxylic acid) was synthesized and structurally characterized. Function explorations demonstrate that the MOF is a smart chemical sensor towards nitrobenzene (NB) detection and also a highly active catalyst for the cycloaddition reaction of CO 2 with epoxides to synthesize cyclic carbonates. [Display omitted] [ABSTRACT FROM AUTHOR]

A new thermostable Sr(II) compound, formulated as [Sr(bdc)(H2O)(DMF)]n ⋅ x(solvent) (1, H2bdc=terephthalic acid, DMF=N,N'‐dimethylformamide), has been synthesized from the solvothermal reaction of Sr(NO3)2 and H2bdc. The X‐ray structural analysis revealed that compound 1 features a 3D framework based on 1D Sr(II)‐carboxylate chains, and the coordinated and free solvent molecules filled in the 1D channels of 1, which can be easily removed from the 3D framework via heat treatment activation. The obtained solvent‐free samples 1 a not only shows high adsorption capacities of C2H2 and CO2 at 298 K, moderate adsorption selectivity for C2H2/CH4, CO2/CH4, but also can be used as a luminescent probe for the detection of nitroaromatic explosives. [ABSTRACT FROM AUTHOR]

Luminescent metal‐organic frameworks (LMOFs) as sensors with "turn‐on" detecting ability have attracted much attention and remain challenging yet. Herein, two novel LMOFs from homonuclear Mn (II)‐MOF (1) to heteronuclear Mn (II)‐K(I)‐MOF (2) have been synthesized directionally only by alkali regulation. Through the introduction of K(I), heteronuclear 2 exhibits a porous reticulated network with 1D open channels. Both 1 and 2 are highly emissive and show great sensitivity and selectivity, ultrafast response time, and excellent recyclability for "off–on" ascorbic acid sensing. Significantly, the highly permeable channels in 2 allow easy host–guest interaction and contribute to lower detection limit than 1. The controllable assembly of 1 and 2 realizes a novel mode of structure and luminescence tunability, which is crucial for discovering luminescent materials with high‐performance for real‐time detection applications. [ABSTRACT FROM AUTHOR]

This Minireview covers the latest developments of chemosensors based on transition‐metal receptors and organic fluorophores with specific binding sites for the luminescent detection and recognition of iodide in aqueous media and real samples. In all selected examples within the last decade (made‐post 2010), the iodide sensing and recognition is probed by monitoring real‐time changes of the fluorescence or phosphorescence properties of the chemosensors. This review highlights effective strategies to iodide sensing from a structural approach where the iodide recognition/sensing process, through supramolecular interactions as coordination bonds, hydrogen bonds, halogen bonds and electrostatic interactions, is transduced into an optical change easily measurable. The selective iodide sensing is an active field of research with global interest due to the importance of iodide in biological, medicinal, industrial, environmental and chemical processes. [ABSTRACT FROM AUTHOR]

Conventional luminescent sensors relying on single emission responsive to analytes demonstrate limited sensitivity and selectivity and developing novel self‐calibration probes is highly required. A series of water‐stable coordination polymers (CPs) with three emitting centers for tunable emissions is reported. They are facilely synthesized by simultaneously doping red‐emitting Eu3+ and green‐emitting Tb3+ into the same framework. The versatile Eu0.67Tb0.33–CP is applied to conveniently distinguishing different nitroaromatics pollutants and multidimensional ratiometric sensing CrO42−/Cr2O72−. Specific nitroaromatics can cause unique changes to the ligand→Eu3+/Tb3+ energy transfer efficiency, while CrO42−/Cr2O72− intriguingly quench the three emissions at different rates. Each nitroaromatic exhibits notably correlation to a unique combination of the two ligand→Eu3+/Tb3+ emission intensity ratios, enabling a 2D fingerprint recognition. Furthermore, the concentration‐dependent evolution of the two ratios upon exposure to CrO42−/Cr2O72− can be mapped out, achieving a 3D code recognition. As a result, the sensor demonstrates selective recognition of 4‐nitrophenol and CrO42−/Cr2O72− with high sensitivity and selectivity as well as great recycling ability. Both the synthetic and sensing strategies present a promising strategy to develop facile and effective ratiometric sensors. [ABSTRACT FROM AUTHOR]

Three metal–organic coordination polymers, [M(2,6‐bip)2] (M = Zn (1), Ni (2)) and [Cu (tfbdc)(2,6‐bipH)2]•2H2O (3), were obtained with the similar solvothermal reaction systems of bivalent transition metal salt, 6‐(1H‐imidazol‐1‐yl)‐2(1H)‐pyridinone (2,6‐bipH) and 2,3,5,6‐tetrafluoroterephthalic acid (H2tfbdc). The three coordination polymers show different framework features, namely 3D (1), 2D (2) and 1D (3) structures, which are resulted from different single‐metal ion "node" and "linker" coordination modes. The [ZnO2N2] tetrahedron in 1 and [NiO2N4] octahedron in 2 as a node, is formed from Zn sp3 and Ni d2sp3 hybrid orbits, respectively, while the linker, 2,6‐bip, adopts the μ2:η1η1η0 in 1 and μ2:η1η1η1 in 2 coordination modes. PLATON calculation suggests that 1 possesses the micropore structure with a pore volume of 14.2%. In 3, the [CuO2N2] parallelogram as a node is derived from Cu dsp3 hybrid orbital, while the linkers of 2,6‐bipH and tfbdc adopt the μ1:η1η0η0 and μ1:η1η0/μ1:η1η0 coordination modes, respectively. Intriguingly, Zn(d10)‐centre coordination polymer 1 shows strong blue emission, which are derived from the π* → π transition of the 2,6‐bipH ligand. Moreover, 1 exhibits high stability and strong luminescence in both water and ethanol. At this point, the performance of 1 is studied as a chemical sensor for detecting fluoroquinolones drug. The results show that 1 can detect enoxacin in ethanol solution with a low detection limit of 3.61 × 10−5 M. The luminescent sensing mechanisms were investigated from experimental methods and theoretical calculation in detail as well. [ABSTRACT FROM AUTHOR]

Heteroleptic Cu(N^N)(P^P) complexes have garnered significant attention owing to their various structures and remarkable photophysical properties. Four novel heteroleptic copper(I) complexes (C1 •2BF 4 ˉ, C2 •3BF 4 ˉ, C3 •3PF 6 ˉ and C4 •3PF 6 ˉ) of the type {(Cu(P^P)) 3 (μ -HATN)} synthesized by ligand conformation-directed self-assembly methodology were reported herein. These copper(I) complexes with different coordination configuration could be obtained through a straightforward change in the rigidity and volume in different P^P ligand scaffolds. Furthermore, these copper(I) complexes exhibited exceptional visible light absorption, which were contributed to metal-to-ligand charge transfer and intra-ligand charge transfer. Moreover, these emissive heteroleptic Cu(I) complexes all displayed remarkable sensitivity and selectivity towards zinc ions in "turn-on" mode (intensity enhanced ca.60 times). The detection limitation of complex C1 •2BF 4 ˉ reached to 5.10 × 10−9 M, which was lower than those reported fluorescent sensors. The possible sensing mechanism was investigated using ESI-Ms, NMR and DFT calculation. The reversible "on-off" fluorescent sensing behavior can be restored by treating the solution alternately with EDTA tetrasodium salt and Zn2+ salt. Control self-assembly of Cu(N^N)(P^P) complexes. Adopting four different volume and size of P^P ligands, four novel heteroleptic polynuclear copper (I) complexes were synthesized through ligand confirmation-directed self-assembly methodology. These complexes shown a highly sensitive and selective detection towards zinc ions in "turn-on" mode and detection limitation lowered to 5.10 × 10−9 M. The reversible "on-off" fluorescence sensing behavior can be recovered by sequential addition of EDTA tetrasodium and Zn2+ salts in three runs. [Display omitted] • Four heteroleptic copper(I) complexes (C1 – C4) were synthesized through ligand confirmation-directed self-assembly. • Complex (C1– C4) showed sensitive and selective detection towards Zn2+ in "turn-on" mode. • This work revealed a detailed molecular understanding of ligand conformation controlled precise synthesis. [ABSTRACT FROM AUTHOR]

• Two luminescent d10 metal coordination polymers were constructed. • Compound 1 shows highly selective and sensitive response to nitrofurazone. • The sensing mechanism was discussed by theoretical calculations. Two new coordination polymers with formulae [Zn(HL)(bb)] n (1) and [Cd(HL)(bb)] n (2) (H 3 L = 1,3,5-tris(3-carbonylphenyloxy)benzene and bb = 4,4′-bis(imidazolyl)biphenyl) have been synthesized solvothermally and structurally characterized by elemental analysis, IR, single crystal X-ray diffraction and thermal analyses. Single crystal X-ray diffraction studies reveal that compounds 1 and 2 show similar three-fold interpenetrating 4-connected 2D framework structure with the sql topological net and the Schläfli symbol of {44·62} and are further extended into 3D supramolecular network by inter-molecular hydrogen bonding. Compound 1 have been used as turn-off luminescent sensor and displayed sensitive and selective luminescence sensing for nitrofurazone antibiotic (NFZ) with K sv of 0.87 × 103 M−1 and 1.98 ppm limit of detection (LOD). The plausible mechanistic pathway for the detrioration in the luminescent intensity of 1 in presence of antibiotics have been explained with the help of theoretical calculations. The calculations indicated that the decline in fluorescence intensity of 1 was accredited to the electron/energy transfer as well as weak interactions operating between 1 and antibiotic. [Display omitted] [ABSTRACT FROM AUTHOR]

• Mixed-lanthanide strategy was practiced to construct ratiometric luminescent sensor. • Dual-emissive mixed-lanthanide MOF as a ratiometric sensor achieves sensitive detection of tetracycline and nitrophenols. • Noticeable luminescence turn-off response of membrane-based sensor towards tetracycline is visual by naked eye. Solvothermal treatment of Gd(III)/Eu(III) salts with 2,3,5,6-tetrachloroterephthalic acid (H 2 tClbdc) and 1,10-phenanthroline (phen) afforded three two-dimensional lanthanide metal‒organic frameworks (MOFs), [Ln(tClbdc)(phen)(H 2 O)(NO 3)] n (1-Ln , Ln = Gd, Eu, Eu 0.03 Gd 0.97). The dual-emitting characteristic along with the excellent solution and photophysical stability of the mixed-lanthanide MOF 1-Eu 0.03 Gd 0.97 make it a highly sensitive luminescent sensor to ratiometrically detect tetracycline (TC), picric acid (PA) and 4-nitrophenol (4-NP), with the limits of detection of 0.38 μM, 0.75 μM and 1.49 μM for TC, PA and 4-NP, respectively. The significant luminescence quenching of the lanthanide-based sensor by these organic pollutants might be ascribed to inner filtration effect (IFE), fluorescence resonance energy transfer (FRET) and hydrogen-bonding and/or electrostatic interactions between the sensor and phenolic analytes. More significantly, 1-Eu 0.03 Gd 0.97 filled mixed-matrix membranes could be employed as an easy-to-use sensory tool for visual recognition of TC by the turn-off red emission signal. [Display omitted] [ABSTRACT FROM AUTHOR]

Antibiotics are one of the emerging contaminants in water, which have a great impact on ecosystems and human health. It has been challenging to simultaneously realize low-cost, rapid, highly sensitive and selective detection of antibiotics with conventional methods. Here, we report luminescent chemosensors for detecting antibiotics in water, based on metal-organic framework (MOF), i.e., zeolitic imidazolate framework-8 (ZIF-8), loaded with rhodamine B (RhB) and fluorescein disodium salt (FSS) dyes. Compared with ZIF-8, the fluorescence signals of RhB@ZIF-8 and FSS@ZIF-8 were significantly improved and presented ultrahigh sensitivity to nitrofurans (NFAs) and tetracyclines (TCs) with fluorescence quenching and fluorescence enhancement in water, respectively. The unique structures and properties of RhB@ZIF-8 and FSS@ZIF-8 lead to outstanding sensitivities in antibiotic detection. For instance, the RhB@ZIF-8 sensor shows the lower limit of detection (LOD) of 0.26 μM to nitrofurantoin (NFT), 0.47 μM to nitrofurazone (NFZ), 0.11 μM to tetracycline (TC), and 0.14 μM to oxytetracycline (OTC); while the FSS@ZIF-8 sensor shows the LOD of 0.31 μM to NFT, 0.35 μM to NFZ, 0.17 μM to TC, and 0.16 μM to OTC. In addition, NFT and TC were also successfully detected by FSS@ZIF-8 in water from real water environment. The results indicate that dye@MOF-based luminescent composites are favorable for antibiotic detection, presenting great potentials in water quality monitoring. Image 1 • The MOF-based luminescent sensors were developed to detect antibiotics in water. • Sensors showed high sensitivity and selectivity to nitrofurans and tetracyclines. • Sensors showed good stability and recyclability in aqueous environment. • Detection mechanisms of fluorescence quenching/enhancement were presented. [ABSTRACT FROM AUTHOR]

A simple, cost-effective, and portable uranium sensory material with adequate selectivity is increasingly urgent and would be of great importance in environmental monitoring of radionuclides. Herein, we report a novel luminescent europium metal-organic framework (Eu-MOF) with plenty of Lewis basic sites for binding uranyl ions (UO22+), the most common form of uranium in solution, through a facile one-step solvothermal synthetic route. The mesoporous structure consists of europium nodes and flexible nitrogen-containing ligands with a 29.2 × 20.5 Å2 channel along the c-axis. Furthermore, the obtained material displays characteristic fluorescence of trivalent Eu3+ and could be applied as a turn-off sensory probe targeting UO22+ in solution. Differential fluorescent quenching occurred upon a series of potential interfering ions compared to UO22+ and the detection limit as low as 0.9 μM was achieved with a rapid response. [ABSTRACT FROM AUTHOR]

Water stable Zn(II) coordination polymer used as highly selective and sensitive luminescent sensor for Cr(VI) and MnO 4 − ions in the aqueous phase. Three isostructural coordination polymers have been synthesized and structurally characterized by IR, TGA, PXRD and X-ray single crystal diffraction. The 1D butterfly chains assembled to a novel 3-D supramolecular framework via hydrogen bonding and π–π stack. The complex 1 exhibited high fluorescence stability in water solution and can simultaneously detect Cr 2 O 7 2−, CrO 4 2− and MnO 4 − ions in aqueous media with high quenching constant and low detection limits of 6.82 × 104 M−1 and 4.06 μM for Cr 2 O 7 2−, 1.38 × 103 M−1 and 26.1 μM for CrO 4 2− ions, 3.1 × 104 M−1 and 6.73 μM for MnO 4 −. The result of interference study displayed that the compound can selectively detect Cr(VI) and MnO 4 − anions, indicating compound 1 may be a potential material for sensing Cr(VI) and MnO 4 − anions. [ABSTRACT FROM AUTHOR]

Abstract Four coo;rdination polymers (CPs), namely, [Ni(HDNA)(bibp)(H 2 O)] n (1), [Co(HDNA)(bibp)] n (2), {[Co(HDNA)(bibp)]·H 2 O} n (3) and {[Zn(HDNA)(bibp)]·H 2 O} n (4), have been synthesized from the mixed-ligand strategy of 6-(3,5-dicarboxylphenyl)nicotinic acid (H 3 DNA) and 4,4′-bis(benzimidazo-1-ly)benzene (bibp). Structural analyses revealed that four CPs all feature 2D sheets with diverse nets from {44.62}- sql net (1), {Co 2 (COO) 2 } SBUs based {44.62}- sql net (2), to 4-connected {65.8} sheet (3 & 4). Besides, the temperature-dependent magnetic susceptibilities of CPs 1 - 3 were investigated. And the luminescent sensing indicated CP 4 is a good bifunctional sensor for Fe3+ and Cr 2 O 7 2- ions. Graphical abstract Pictogram Four coordination polymers based on 6-(3,5-dicarboxylphenyl)nicotinic acid and 4,4′-bis(benzimidazo-1-ly)benzene: antiferromagnetic magnetic properties and luminescent sensing. fx1 Highlights • Four coordination polymers were designed by the mixed-ligand strategy and characterized. • The temperature-dependent magnetic susceptibilities of 1 - 3 were investigated. • Luminescent sensing indicated 4 is a good bifunctional sensor for Fe3+ and Cr 2 O 7 2- ions. [ABSTRACT FROM AUTHOR]

Graphical abstract A multifunctional 2D Co(II) metal–organic frameworks (NCST-1) with a sql topology was synthesized under hydrothermal condition. NCST-1 /GCE exhibits remarkable performance for H 2 O 2 reduction. Furthermore, NCST-1 can act as a luminescent sensor for Fe3+, Hg2+, and Ag+ in aqueous solution and serve as photocatalyst for the degradation of MB. Abstract A new multifunctional cobalt(II)-based metal–organic framework, [Co(DCTP)(L)(H 2 O) 2 ] n (NCST - 1 , NCST = North China University of Science and Technology), was synthesized by self-assembly of Co(OAc) 2 ·4H 2 O with 1,4-bis(benzimidazol-1-ylmethyl)-benzene (L) and 2,5-dichloroterephthalic acid (H 2 DCTP). Single-crystal X-ray diffraction analyses reveal that NCST - 1 is a 2D (4,4) sheet, which is further expanded into a 3D supramolecular network by O H⋯O hydrogen bond interactions. A non-enzyme electro-catalytic sensor was developed for sensing hydrogen peroxide (H 2 O 2) based on the NCST - 1 , which was cast-coated on glassy carbon electrode (GCE). The modified sensor exhibited a remarkable performance for H 2 O 2 reduction with an extended liner range (5 μM–7 mM, 7 mM–18 mM), a fast response time (3 s), a high sensitivity (52.55 μA mM−1 cm−2), and a low detection limit (6.86 μM) in alkaline solution. Furthermore, NCST - 1 , as a luminescent probe, displayed prominent multifunctional sensing property for Fe3+, Hg2+ as well Ag+ through fluorescence quenching effect. The emission intensity of NCST - 1 increases linearly with the increasing concentration of Fe3+ with a Stern–Volmer constant (K sv) of 1.12 × 104 M−1 and a detection limit (LOD) of 0.13 μM in aqueous solution. For mercury ion (II), K sv = 7.58 × 103 M−1 and LOD = 1.10 μM. For silver ion (I), K sv = 6.22 × 103 M−1 and LOD = 1.33 μM. Finally, the photocatalytic activities of NCST - 1 were evaluated in the degradation of methylene blue (MB), Rhodamine B (RhB), and methyl orange (MO). The degradation efficiency for MB reached up to 91.3%, although NCST - 1 hardly showed degradation ability towards RhB and MO. [ABSTRACT FROM AUTHOR]

Abstract Nine coordination polymers, [Tb(HL)(C 2 H 5 OH) 2 ] (1), [Eu(HL)(C 2 H 5 OH) 2 ] (2), [Gd(HL)(C 2 H 5 OH) 2 ] (3), [Sm(HL)(C 2 H 5 OH) 2 ] (4), [Yb(HL)(C 2 H 5 OH) 2 ]·0.5H 2 O (5), [Cd 3 (HL) 2 (DMF) 2 (H 2 O) 4 ]·4DMF (6), [Zn 2 L(H 2 O)]·DEF (7), [Mn 2 L(DMF)(H 2 O) 3 ]·2DMF·3H 2 O (8) and [Co 2 (HL)(μ 3 -OH)(H 2 O) 2 ]·DMF·2.5H 2 O (9) (H 4 L = 2,8,14,20-tetra-ethyl-4,10,16,22-tetrakis(4-carboxybenzyl)oxy)-6,12,18,24- tetra-methoxy-resorcin[4]arene) have been synthesized. In compounds 1–6 and 9 , H 4 L is partially deprotonated to generate HL3−, while in 7 and 8 , it is completely deprotonated. Compounds 1–5 are isostructural and exhibit one-dimensional (1D) ribbon, and the ribbons are combined together by C-H··· π interactions to yield supramolecular layers, respectively. 6 forms a layer, and the layers are combined by hydrogen bonds to create a 3D supramolecular architecture. 7 and 8 demonstrate 3D frameworks. Compound 9 displays a double-stranded ribbon, where C-H··· π interactions and hydrogen bonds link adjacent ribbons to produce a supramolecular 3D framework. The luminescent behaviors of 1 – 7 have been investigated. Compound 1 is highly luminescent and shows sensing ability for acetone and Fe3+ ions. Graphical abstract Nine coordination polymers have been prepared based on a new resorcin[4]arene-functionalized tetracarboxylic acid. Compound 1 exhibits highly selective luminescent detection to acetone and Fe3+ ions by quenching process. Image 1 Highlights • A new resorcin[4]arene-functionalized multicarboxylic acid was prepared. • Based on this ligand, nine coordination compounds have been synthesized. • Compound 1 exhibits high activities for luminescent detecting Fe3+ and acetone. [ABSTRACT FROM AUTHOR]

Abstract In this work, zeolitic imidazolate framework-8 (ZIF-8), which possesses high porosity and excellent thermal and chemical stability, has been employed as host framework to encapsulate luminescent chromophores guest AlQ 3 [tris(8-hydroxyquinoline)-aluminium]. Two host-guest hybrids AlQ 3 @ZIF-8 (ZA-1 and ZA-2) were prepared by embedding different amounts of AlQ 3 into the ZIF-8 cavities. As expected, the hybrids display intense luminescence with wide wavelength in the visible light region. The luminescent properties of ZA-1 and ZA-2 were developed to probe metal cations, anions and volatile organic molecules. Two hybrids exhibit high selective and sensitive quenching effects to Fe3+, CrO 4 2- and acetone. More significantly, AlQ 3 @ZIF-8 luminescent sensors are reusable for the trace detection. Graphical abstract In this work, two host-guest hybrids ZA-1 and ZA-2 were synthesized by encapsulating chromophore AlQ 3 in ZIF-8 matrixes and analyzed by a series of physical characterizations. The hybrids exhibit highly and repeatedly selective and sensitive luminescent detections to Fe3+, CrO 4 2- and acetone. fx1 Highlights • Two host-guest hybrids ZA-1 and ZA-2 were prepared and well characterized. • The hybrids display intense luminescent emissions in the visible light region. • The hybrids exhibit luminescent quenching effects to Fe3+, CrO 4 2- and acetone. [ABSTRACT FROM AUTHOR]

Graphical abstract A film of Th(IV)acetylacetonate was converted to an amorphous ThO 2 film by UV irradiation at room temperature. After annealing at >550 °C a polycrystalline film was obtained with a preferential orientation along the ThO 2 (111) direction. Luminescence of a ThO 2 film was reversibly quenched by 60 ppm of CO gas. Abstract Thorium oxide thin films were successfully prepared by direct UV irradiation of amorphous films composed of thorium(IV) β-diketonate precursor complexes on Si(100) and quartz substrates. The ThO 2 films were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and atomic force microscopy (AFM). The X-ray diffraction patterns showed that the films that annealed at T° below 550 °C were amorphous. The films that annealed at 550 °C and above exhibited a preferred orientation along the (111) plane. Both the as-photodeposited and annealed ThO 2 films exhibited a good optical quality with transparency in the visible region better than 85%. Photoluminescence of ThO 2 thin films was reversibly quenched when exposed to 60 ppm of CO at room temperature. [ABSTRACT FROM AUTHOR]

A novel Metal-Organic Framework (MOF), [Co(L)(pda)(H 2 O) 2 ]·2H 2 O (1), had been assembled by the solvothermal method using 3,3′-di(1 H -imidazol-1-yl)-1,1′-biphenyl (L) and ligand 1,4-phenylenediacetic acid (H 2 pda) as starting materials and coordinating with cobalt metal. 1 belongs to the P -1 space group, triclinic system, and develops from a 2D network structure to a 3D structure through hydrogen bonding. 1 was well characterized by single-crystal X-ray crystallography (SCXRD), elemental analyses (EA), infrared spectra (IR), powder X-ray diffraction (PXRD), thermogravimetric analyses (TGA), and UV-absorption spectra. The crystal texture of 1 can stably exist before 305 ℃ and is a high-temperature resistant MOF material. In the meantime, 1 also has high stability in water. Besides, the fluorescence test results revealed that 1 can effectively identify and detect small organic molecules, antibiotics, anions, and cations due to its super luminescent properties. Hence, 1 can serve as a multifunctional luminescent probe to sense acetone, sulfamethazine, CrO 4 2-, Cr 2 O 7 2-, and Fe3+. [ABSTRACT FROM AUTHOR]

• Three new MOFs have been synthesized under solvothermal conditions. • Their structures have been analyzed and characterized systematically. • MOF 1 exhibits a stronger fluorescence emission band. • MOF 1 can detect TNP, Fe3+, Cu2+ and CrO 4 2− ions with high selectivity and sensitivity. Three new MOFs [Cd(2,5-bipi)(5-hip)] n (1), [Mn(2,5-bipi)(1,3-bdc)] n (2), and [Co(2,5-bipi)(1,3-bdc)(DMF)] n (3) (2,5-bipi = 2,5-bis(1-imidazoly)pyridine, 5-H 2 hip = 5-hydroxyisophthalic acid, 1,3-H 2 bdc = isophthalic acid) have been successfully synthesized under solvothermal conditions. They were characterized by elemental analysis, FT-IR spectra, X-ray single-crystal diffraction, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA). The results suggest that the linkage of different ligands with metal ions affords a 4-connected layer. And these 2D networks are extended to the final 3D supramolecular architectures by C H∙∙∙π stacking interactions. Fluorescence sensing measurements showed that MOF 1 can detect TNP, Fe3+, Cu2+ and CrO 4 2− ions with high selectivity and sensitivity. In addition, their possible quenching mechanisms were studied in detail. [Display omitted] [ABSTRACT FROM AUTHOR]

In this work, a flexible asymmetric semi-rigid bi-functional ligand 5-(4-((1H-1,2,4- triazol-1-yl)methyl)phenyl)-1H-tetrazole (HL) has been employed. A series of unique Cu II and Cu I coordination compounds, namely [Cu( μ 2 -L) 2 (H 2 O) 2 ] n ( 1 ), [Cu( μ 2 -L) 2 (H 2 O) 2 ] n ( 2 ), [Cu( μ 4 -L)] n ( 3 ) and [Cu 2.5 ( μ 4 -L)(CN) 1.5 ] n ( 4 ), have been prepared under hydro(solvo)-thermal conditions. 1 and 2 present scarcely reported temperature induced polymorphic 1D ( 1 ) and 2D ( 2 ) copper(II)-L coordination frameworks. When HL and CuBr 2 are employed to react in the mixed H 2 O/CH 3 CN (1:1) solvent system, the 3D Cu I - HL coordination polymer 3 can be isolated. The Cu I centers in 3 should be the reduction of Cu II ions by CH 3 CN solvent. When CuBr is used to replace CuBr 2 under similar synthetic conditions of 3 , 4 can be isolated. 4 is a unique 3D Cu I cluster-based coordination framework assembled from L − and CN − . PXRD patters of all the bulky samples 1 – 4 also have been determined, which agree well with theoretical PXRD patterns, confirming pure phases. Photo-luminescent measurements also show that complexes 3–4 can behave highly sensitive photo-luminescent sensing of small solvent molecules DMF and NMP. Additionally, 4 also exhibits highly selective and sensitive photo-luminescent discriminating of dichromate anions in aqueous solutions with excellent quenching efficiency (K sv  = 2.38 × 10 4  L mol -1 ). The experiment result also demonstrates the broad prospects in the preparation of these novel coordination frameworks using these flexible bi-functional asymmetric semi-rigid ligands as basic building blocks. [ABSTRACT FROM AUTHOR]

Based on the hydrolysates of N , N ′-bis(3,5-dicarboxylatophenyl)pyromelliticdi-imide) (H 4 L) and 1,3-bis(imidazol-1-ylmethyl)benzene (bimb), three coordination polymers, namely, {[Zn(BTC) 0.5 (bimb)]·4H 2 O} n ( 1 ), [Cu(BTC) 0.5 (bimb)] n ( 2 ), and {[Cd(AIP)(H 2 O)]·H 2 O} n ( 3 ), have been obtained under solvothermal conditions. The possible hydrolysis mechanism of H 4 L was investigated here. Structural analyses reveal that complex 1 is a 3D (4,4)-c {6 4 .8 2 }{6 6 } 2 - bbf net. Complex 2 displays a 2D 4-c {3 2 .6 2 .7 2 }- kgm sheet. While complex 3 exhibits a 3D (3,6)-c {4.6 2 } 2 {4 2 .6 10 .8 3 }- rtl net based on binuclear {Cd 2 (COO) 4 } SBUs. Besides, luminescent sensing investigation indicated that 1 and 3 exhibit highly sensitive and selective sensing of chromate anions in aqueous solution. [ABSTRACT FROM AUTHOR]

ABSTRACT Based on the designed conjugated ligand of N,N'-dioxide 3,3'-benzo(c)cinnoline dicarboxylic acid (H 2 DBCD) with the aid of d10-metal cations and two ancillary bis(imidazole) bridges, two 3D coordination polymers， namely, {[Cd(DBCD)(1,3-bib)]·(H 2 O) 2 } n (1), {[Zn(DBCD)(1,4-bib)]·(H 2 O) 2 } n (2), were constructed here. Structural analyses show compounds 1 and 2 are 3-fold and 6-fold interpenetrating dia nets, respectively. Further luminscence studies suggested that the two CPs can selectively and sensitively detect Fe3+ cation in aqueous solution and nitrobenzene derivatives nitrobenzene (NB), p-nitrotoluene (PNT), p-nitroaniline (PNA) and p-nitrophenol (PNP) in DMF. Graphical abstract Pictogram: Two topology structure of the designed 3D interesting interpenetrating diamond nets CPs with the detection capability for FeIII cation and nitrobenzene derivatives. fx1 Highlights • The conjugated N,N'-dioxide 3,3'-benzo(c)cinnoline dicarboxylic acid was designed firstly here. • Two 3D diamond nets with 3-fold and 6-fold interpenetrating structures were constructed. • Compounds 1 and 2 exhibit highly luminescence quenching to FeIII ions and nitrobenzene derivatives. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • Five iso-structural Ln-CPs have been synthesized from a symmetric tetracarboxylic acid. • 1 – 5 Show 2D hexagonal honeycomb structures and exhibit characteristic emissions of Ln3+ ions. • 1 Exhibits excellent sensing of metal ions and solvent molecules. Abstract A series of lanthanide coordination polymers (Ln-CPs) {(Me 2 NH 2 +)[Ln(L)(H 2 O) 2 ]} n (1 – 5) [Ln = Eu(1), Tb(2), Gd(3), Sm(4) and Pr(5)], were synthesized through the self-assembly of symmetric tetracarboxylic acid 3,5-bis(3,5-dicarboxylphenyl)-pyridine (H 4 L) and different lanthanide ions. Ln-CPs 1 – 5 are isostructural and show two-dimensional (2D) layered structure constructed from LnO 9 tricapped trigonal prisms and L4− ligands. Solid state luminescent studies illustrate that 1 , 2 and 4 exhibit the characteristic emission of the corresponding Ln3+ ions, while 3 reveals blue emission arising from the organic ligand and 5 shows characteristic luminescence emission bands of Pr3+ ions in the near-infrared region (NIR). Notably, 1 exhibits good luminescent sensing for metal ions, such as Cr 2 O 7 2− ions, MnO 4 − ions, Fe3+ ions, and small organic molecules, including acetone and trinitrophenol (TNP). [ABSTRACT FROM AUTHOR]

Abstract Two lanthanide metal-organic frameworks (LOFs), namely, {[Tb(L3−) (H 2 O)]·3CH 3 CN} n (1) and {(Me 2 NH 2 +) 0.5 ·[Gd(L3−)(HCOO−) 0.5 H 2 O]·DMF·4EtOH·H 2 O} n (2) have been constructed by tris(4-carboxyphenyl)phosphane oxide (H 3 L) under solvothermal conditions. Structural analyses indicate that complex 1 appears a 3D 6-connected {412∙63} net based on the binuclear {Tb 2 (COO) 2 } clusters. Complex 2 is also a 3D framework. Furthermore, the photoluminescence of 1 in the solid state and different solvent emulsions were studied, the results indicate that 1 shows characteristic green emission of Tb3+ ion and has better fluorescent recognition for sorts of organic solvent molecules and Fe3+ ion. Finally, the result of the variable-temperature magnetic susceptibilities suggests that complex 2 have antiferromagnetic behavior between Gd(III) ions. Graphical abstract Based on the tripodal tris(p -carboxyphenyl)phosphane oxide ligand, two lanthanide metal–organic frameworks were obtained with highly sensitive sensing of complex 1 for nitrobenzene derivatives and Fe3+ ion, and magnetic properties of 2. Unlabelled Image Highlights • Two new metal-organic frameworks were synthesized and characterized. • Complex 1 can detect nitrobenzene derivatives and Fe3+ ion. • Complex 2 have antiferromagnetic behavior between Gd(III) ions. [ABSTRACT FROM AUTHOR]

Based on the mixed ligands of aromatic pentacarboxylate of 3,5-di(2′,4′-dicarboxylphenyl)benozoic acid (H 5 L) and 1,4-bis(imidazol-1-yl) benzene (bib), two novel coordination polymers, namely, [Ni 1.5 (H 2 L)(bib) 1.5 (H 2 O) 2 ] n ( 1 ), and {[Pb 2 (HL)(bib) 1.5 (H 2 O)]·H 2 O} n ( 2 ) have been synthesized and characterized by EA, IR, TG, PXRD. Structure analyses reveal that complexes 1 and 2 are both (3,4,4)-connected structures with the same stoichiometry of (3-c) 2 (4-c) 2 (4-c), the 2D {6 3 } 2 {6 4 .8.10}{6 4 .8 2 } 2 trilayer for 1 , and 3D {6.8 2 } 2 {6 4 .8 2 } 2 {8.10 4 .12} network for 2 . Complexes 1 and 2 exhibit excellent recyclable, selective, and sensitive detection of Cr(VI) anions in aqueous solution. The possible mechanism for selective luminescence quenching responses toward Cr(VI) anions is also discussed in detail. [ABSTRACT FROM AUTHOR]

Graphical abstract Four complexes based on two tetracarboxylate-functionalized resorcin[4]arenes have been synthesized. The luminescence sensing abilities of 1 – 3 for detecting nitrobenzene and Cr 2 O 7 2− were also investigated. Highlights • Four complexes base on two novel resorcin[4]arenes have been synthesized. • 1 – 3 could be applied as fluorescence sensors for nitrobenzene and Cr 2 O 7 2− anion. • 2 and 3 exhibit similar high sensitivity on detecting Cr 2 O 7 2− anion. Abstract Four new coordination complexes, namely, [NH 2 (CH 3) 2 ] 2 [Cd(L1)(DMF) 2 ] (1), [Zn(L1) 0.5 (phen)]·H 2 O (2), [Zn 2 (L2)(Phen) 2 (H 2 O) 2 ] (3) and [NH 2 (CH 3) 2 ][Zn 2 (L1)(Cl)(DMF)(H 2 O)]·2H 2 O (4) have been synthesized (H 4 L1 = 2,8,14,20-tetra-phenyl-4,12,16,24-tetra-oxyallylene-6,10,18,22-tetra-carboxymethoxy-resorcin[4]arene, H 4 L2 = 2,8,14,20-tetra-ethyl-6,12,18,24-tetra-oxyallylene-4,10,16, 22-carboxymethoxy-resorcin[4]arene and phen = 1,10-phenathroline). Complex 1 shows an infinite chain. Complexes 2 and 3 exhibit similar ribbon structures. The ribbons in 2 are extended by C-H⋯ π interactions to create a supramolecular layer. While in 3 , the ribbons are further connected via H-bonds and π - π interactions to yield a supramolecular double-layer. Complex 4 reveals a 3D framework with 4-connected (4284) 2 (427282) 2 topology. Solid state luminescent properties for all complexes were investigated. The temperature dependence fluorescence of 2 and 3 were studied. Luminescence sensing abilities of 1 – 3 for detected nitrobenzene and Cr 2 O 7 2− in aqueous were also investigated. [ABSTRACT FROM AUTHOR]

A novel Cd(II) metal–organic framework, [Cd 3 L 3 (DMF) 2 ] n ( 1 ), was synthesized using 5-(1H-1,2,4-triazol-1-yl)isophthalic acid (H 2 L) and Cd(NO 3 ) 2 ·6H 2 O under solvothermal condition. The structure of 1 was characterized by X-ray crystallography, elemental analysis, and IR spectrum. Compound 1 possessed a fascinating three-dimensional (3D) double-walled framework with one-dimensional (1D) channels. The luminescence properties of compound 1 toward anion detection were systematically investigated. The results indicate that compound 1 behaves as a highly selective and sensitive ‘turn-off’ luminescence probe toward Cr 2 O 7 2− anion. [ABSTRACT FROM AUTHOR]

Two copper(I) iodide compounds with formula of {[Cu 2 I 2 (2-mna)]·DMA} ( 1 ) and {[CuI(6-mna)]·DMSO} ( 2 ) (2-mna = 2‑mercaptonanicotinic acid; 6-mna = 6‑mercaptonanicotinic acid; DMA = dimethylacetamide; DMSO = dimethyl sulfoxide) have been prepared by reaction and evaporation between CuI and 2-mna/6-mna at room temperature. Four Cu atoms in 1 are linked by I − ions and 2-mna ligands into [Cu 4 I 4 (2-mna) 2 ] units which are further linked into a 1D inorganic-organic chain by sharing Cu I bonds. In 2 , thiolate sulfur of 6-mna adopts μ 2 -coordination modes to bridge two Cu atoms, forming [Cu 2 (6-mna) 2 ] building units, which are further connected by I − ions into 1D chain structure. It is worth mentioning that the Cu⋯Cu distances in 1 and 2 are shorter than the sum of the van der Waals radii of copper(I) (2.80 Å), implying the metal-metal bonding interactions. Interestingly, compounds 1 and 2 display blue and red fluorescence emission bands in the solid state, respectively. In particular, compound 2 exhibits the capability to selectively detect Fe 3+ ion as a fluorescence “turn-off” sensor. [ABSTRACT FROM AUTHOR]

Alzheimer’s disease (AD) has become an issue of common concern. With the increasing numbers of people with dementia, the precaution and diagnosis of AD is more and more important. Many reports have pointed out that the AD is closely related to four metal ions within human body, including Zn 2+ , Fe 3+ , Al 3+ and Cu 2+ . On the other hand, magnetic resonance imaging (MRI) plays a key role in the diagnosis of AD. Metal–organic frameworks (MOFs), as one of the well-known inorganic–organic hybrid material, have a promising potential in sensing of AD related ions, as well as MRI contrast agent. In this review, we summarized the recent progress in revealing pathogeny and diagnose of AD and discussed the potential of MOFs in this area. Specifically, MOFs as luminescent sensors for Zn 2+ , Fe 3+ , Al 3+ and Cu 2+ ions and MRI contrast agents are highlighted. [ABSTRACT FROM AUTHOR]

Using a triazole carboxylic ligand (H2L = 4-(1H-1,2,4-triazol-1-yl) isophthalic acid), four water-stable lanthanide metal-organic frameworks (Ln(III)-MOFs) (1-Ln, Ln(III) = Tb, Eu, Dy, and Sm), [Ln(L)(HL)(H2O)2], where the deprotonated H2L ligands have two different coordination modes: L2− and HL− [(a): η2μ2χ2, η2μ1χ2; (b): η2μ1χ2], have been synthesized by solvothermal reaction and characterized by elemental analysis, FT-IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analyses show that Ln(III)-MOFs are isostructural with 2D-layered structures with uncoordinated carboxylic and triazole groups. The luminescent properties of 1-Tb in aqueous solution containing different cationic solutions and small organic solvents have been explored under ultraviolet irradiation at room temperature. The high quenching constant KSV values and low detection limits indicate that 1-Tb exhibits extremely high detection sensitivity and selectivity toward Fe3+ ions and nitrobenzene; 1-Tb can keep its original network and be reused after the sensing experiments, which provide us with an optical material for detecting Fe3+ ions and nitrobenzene. Magnetic studies show that antiferromagnetic exchange interactions exist between Dy(III) ions in 1-Dy. [ABSTRACT FROM AUTHOR]

The detection of Fe 3+ in aqueous solution is a pertinent issue with implications in human health and environmental monitoring. As is known, Zr-based MOFs with UiO-66 topology exhibit extraordinary high thermal and chemical stability, making them excellent candidates for various applications. In this study, we have demonstrated a lanthanide functionalized MOF as a turn-off luminescent sensory material for the detection of Fe 3+ in aqueous media. The proposed MOF, denoted as Eu 3+ @UiO-66(20), was synthesized through a facile hydrothermal reaction and followed Eu 3+ post-functionalization. Luminescent investigations revealed the distinct quenching effect of Fe 3+ , with a fast response time within seconds. The results also demonstrated the excellent selectivity toward Fe 3+ among a series of metal ions in aqueous solution and allowed a low detection limit of 12.8 μM. This work developed a very promising strategy for the simple, accurate and instantaneous sensing of metal ions in practical applications. [ABSTRACT FROM AUTHOR]

A new cobalt(II) coordination polymer, namely [Co(L)(Ndc)]n (I), where L = 1,5-bis(5,6- dimethylbenzimidazole)pentane, H2Ndc = 2,6-naphthalenedicarboxylic acid, was synthesized and characterized by elemental analysis, IR spectra, powder X-ray diffraction and single-crystal X-ray diffraction (CIF file CCDC no. 1548044). Complex I displays a 2D (4,4) layer which further extended into a 3D supramolecular framework via weak C-H···O hydrogen bondings. The luminescence explorations demonstrated that I exhibits highly selective and sensitive sensing for Cr2O72− with high quenching efficiency Ksv value of 9.87 × 103 L mol−1 and low detection limit (0.24 μM (S/N = 3)). Meanwhile I also exhibits highly selective and sensitive sensing for Fe3+ with quenching efficiency Ksv = 3.6 × 104 L mol-1 and low detection limit (0.32 μM (S/N = 3)). Complex I exhibits higher photocatalytic activities for the degradation of methylene blue under UV irradiation. Additionally, the thermal behavior and electrochemical properties of the compound are also presented. [ABSTRACT FROM AUTHOR]

Two 3D modular designed coordination polymers, namely, {[H 2 N(CH 3 ) 2 ] 2 [Mn(TPT)]} n ( 1 ), and {[Cd(TPT) 0.5 (bib)]·0.5H 2 O} n ( 2 ) (H 4 TPT = p -terphenyl-2,2″,5″,5‴-tetracarboxylate acid, and bib = 1,3-bis((imidazol-1-yl) benzene) have been synthesized and structural characterized by EA, IR, TG, PXRD. Single-crystal X-ray diffraction analyses reveal that complex 1 is a 3D 4-connected {4 2 .6 3 .8}– sra net with the tiling modular being [4 2 .6 2 .8 2 ] = [4a.4b.6 2 .8a.8b] (transitivity is 2451). While complex 2 is a 3D (4,4)-connected {6 4 .8 2 }{6 6 } 2 – bbf net with tiling modular is [6.8 2 ]+[6 3 .8] = [6 c.8a.8b]+[6a.6b.6 c.8a] (transitivity is 2352). The variable-temperature susceptibility of 1 has been investigated. Besides, complex 2 exhibits highly sensitive sensing of Fe III ions in DMF solution. [ABSTRACT FROM AUTHOR]

Based on the mixed ligands synthesis strategy, a 3D cobalt (II) coordination polymer, [Co(tptc) 0.5 (bib)] n ( 1 ), has been assembled from p -terphenyl-2,2″,5″,5″'-tetracarboxylate acid (H 4 tptc) and 1,3-bis((imidazol-1-yl) benzene (bib). Structural analysis revealed that complex 1 is a 3D framework, which can be simplified into a (4,4)-connected {6 4 .8 2 }{6 6 } 2 bbf net. And the modular analysis reveals the tiling of 1 is [6.8 2 ] + [6 3 .8] = [6c.8a.8b] + [6a.6b.6c.8a] with the transitivity is 2352. And the luminescent sensing investigation indicating complex 1 exhibits highly sensitive sensing of CrO 4 2− /Cr 2 O 7 2− anions in aqueous solution through strong luminescence quenching effects. [ABSTRACT FROM AUTHOR]

Three coordination polymers (CPs), {[Zn(HL)]·2CH 3 CN} n (1) {[Co(HL)(bimb)]·4H 2 O} n ( 2 ) and {[Cd(HL)(bimb)]·3EtOH·3H 2 O·DMF} n ( 3 ) (H 3 L = tris( p -carboxyphenyl)phosphane oxide, bimb = 1,4-bis(imidazol-1-ylmethyl)benzene) have been synthesized under solvothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric (TG) analysis. Structural analyses reveal that complex 1 appears a 3D 3,5-connected {4.6 2 } 2 {4 2 .6 9 .8 4 } net. While 2 and 3 are 1D polymeric chains that were further packed into 3D supramolecular architectures through hydrogen bond interactions. Furthermore, fluorescence measurements indicate that the complex 1 can sensitively sense acetone, nitrobenzene derivatives and Fe 3+ ion, which implies that the 1 is expected to be luminescence sensor materials for sensing small molecules and metal ions. [ABSTRACT FROM AUTHOR]

Two luminescent metal-organic frameworks (LMOFs), namely, [Cd2(DDCPB)·(DMF)2·H2O]n (CHD-1) and [Zn2(DDCPB)·(DMA)2]n·n(DMA) (CHD-2), were solvothermally constructed, which present structural diversity. Single crystal X-ray diffraction analysis indicates that they consist of [Cd2(μ2-O)2(κ-O)2] building units (for CHD-1), [Zn2(κ-O)6] building units (for CHD-2), which are further linked by multicarboxylate H4DDCPB to construct microporous frameworks. Remarkably, both CHD-1 and 2 exhibit highly efficient luminescent sensing for environmentally relevant Cu2+ ions through luminescence quenching. Theoretical and experimental calculations indicate that the luminescent quenching can be attributes to the donor-acceptor electron transfer between the MOFs and analytes. This work indicates that CHD-1 and 2 could be taken as a potential candidate for developing multifunctional luminescence sensors. [ABSTRACT FROM AUTHOR]

[Display omitted] • Review of preparation and morphology study of lanthanide-doped nanomaterials. • Sensing applications of lanthanide-doped nanomaterials-based analytical probes. • Advances in photo-therapy for tumor treatment with lanthanide-nanomaterials. • We have present trends in sensing, imaging, and therapy of lanthanide-doped nanomaterials. As the population ages, cancer has become a major health concern. Although surgical treatment, chemoradiotherapy, and other clinical treatments have become dominant, their strong invasiveness and intolerable toxic side effects seriously affect patients' quality of life. Therefore, developing non-invasive optical therapy with high safety is of great significance. In the last two decades of development, great progress has been made in lanthanide doped nanoparticles on biomedical applications under near-infrared (NIR) light due to their unique properties. These nanomaterials have been used in a wide range of applications, including bioluminescence marker detection, in vitro and in vivo imaging, photodynamic therapy (PDT), photothermal therapy (PTT), and other therapeutic applications. These therapies have been rapidly developed in the profession involving oncology due to their non-invasive, spatiotemporal controllability, and high efficiency. For this key review, the applications based on lanthanide nanoparticles have been listed as follows: bioimaging, biosensors, PDT and PTT. Some emerging biological applications of lanthanide-doped nanoparticles currently at the forefront of the nano/biological interface are also discussed. Finally, this review summarizes the future opportunities and challenges of nanotechnology research based on lanthanide-doped nanoparticles. [ABSTRACT FROM AUTHOR]

A novel 3D coordination polymer [Zn 2.5 (L)(trz) 2 (H 2 O) 2 ]·2H 2 O ( 1 ) (H 3 L = 5-(4-carboxybenzyloxy)isophthalic acid, trz = 1,2,4-triazole) has been synthesized hydrothermally. Compound 1 displays a 3D (3,8)-connected net with (5 3 ) 2 (5 8 ·6 4 ·7 8 ·8 4 ·9 4 ) topology. The luminescent property of 1 dispersed in different solvents as well as nitro compounds have been investigated systematically, demonstrating high detection sensitivity via a fluorescence quenching mechanism. [ABSTRACT FROM AUTHOR]