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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]

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]

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]

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.

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]

• 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]

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]

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]

[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]

• Two new Zn-based coordination complexes were synthesized, and showed excellent fluorescence properties. • Complexes 1 and 2 exhibit high sensitivity and selectivity for Cu2+ sensing in aqueous solution. • Complexes 1 and 2 show different sensing mechanism to Cu2+. A great quantity of materials for the detection of Cu2+ have been reported, but the structural transformation of these materials is difficult to understand during the detection process and hence less reported. Here, two new Zn-based complexes, namely, [Zn 2 (L)(phen)(H 2 O) 3 ·2.4H 2 O] n (1) and {[Zn(2,2′-bpy)(H 2 O) 4 ][Zn(H 2 L) 2 (2,2′-bpy)(H 2 O) 2 ]·H 2 O} (2), have been successfully constructed under hydrothermal conditions by using the H 4 L linker (3,5-di(3,4-dicarboxylphenyl) pyridine), N-auxiliary ligands (phen = 1,10-phenanthroline and 2,2′-bpy = 2,2′-bipyridine), and Zn2+ with d 10 electron configuration. X-ray crystallographic analysis suggests that 1 features a 2D layer, which is further extend into a 3D supramolecular structure by hydrogen bonding interactions. 2 displays a 0D ionic structure, which can form 2D framework via hydrogen bonding. Notably, complexes 1 and 2 contain multiple O functional sites that can be used to detect guest metal ions. As expected, photoluminescence studies reveal that complexes 1 and 2 are promising luminescence sensors for selective detection of trace amounts Cu2+ ions in aqueous solutions by luminescence quenching mechanism, featuring high sensitivity, and low detection limits (74.6 nM and 301.7 nM). Complexes 1 and 2 have different sensing mechanisms for Cu2+. The quenching mechanism of complex 2 is rare, that is, the irreversible exchange of metal ions induces crystal structural transformation and the exchange process can be clearly monitored by visual color changes [Display omitted] [ABSTRACT FROM AUTHOR]

An ultrastable CP of {[Cd 2 (DDB)(Hbimb)]·3H 2 O} n (1) (H 5 DDB ​= ​3,5-di(2',4'-dicarboxylphenyl)benozoic acid, bimb ​= ​ ortho -bis(imidazole-1-ylmethyl)benzene) was designed and characterized. The unique 3D 4,8-c flu framework of CP 1 was established by the tetranuclear {Cd 4 (COO) 8 } SBUs and organic linkers with abundant π-electrons, which endows itself remarkable chemical stability and outstanding redox performances. Depending on internal filter effect and photo-induced electron transfer, CP 1 possesses excellent luminescence sensing towards nitrofuran antibiotics in aqueous with high sensitive and selectivity, splendid recyclable behaviors, as well as low detection limits. Benefiting from the teteranuclear cluster based framework, 1 @NF shows a 232 ​mV overpotential during hydrogen evolution reaction (HER), with the Tafel slope being 13.93 ​mV·dec−1 and a satisfactory 12 ​h stability. Structure-activity relationships illustrated the hybrid materials of CPs have great potentials as chemosensors and eletctrocatalysts. [Display omitted] • A tetranuclear cluster based ultrastable CP was fabricated through mixed ligands strategy. • CP 1 possesses high sensitive detectability as chemosensor to nitrofurans in water. • 1 @NF is an excellent candidate electrode material for HER. [ABSTRACT FROM AUTHOR]

Two transition-metal coordination polymers have been prepared based on a new tetracarboxylate resorcin [4] arene and btbp ligand. Compound 1 exhibits high selectivity and sensitivity to Fe3+ ions and Cr 2 O 7 2− anions by the quenching process. [Display omitted] • Two complexes base on resorcin[4]arene and btbp ligands have been synthesized. • Compound 1 could be applied as fluorescence sensors for Fe3+ and Cr 2 O 7 2− anion. • Compound 1 exhibits high sensitivity and anti-interferential in detecting Fe3+ and Cr 2 O 7 2− anion. Two coordination polymers, [Cd 2 L(btbp) 0.5 (DMF)(H 2 O)]·3DMF (1) and [Zn 2 L(btbp) 0.5 (H 2 O) 2 ]·DMF·3H 2 O (2) have been synthesized base on resorcin[4]arene, btbp and metal ions in solvothermal conditions (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, btbp = 4,4′-bis(1,2,4-triazole-1-ylmethyl)biphenyl)). The structures of CPs 1 and 2 were determined by single-crystal X-ray diffractometer. Structural analysis shows that 1 and 2 exhibit layer structures. CPs 1 and 2 were characterized by Fourier transform infrared spectroscopy (FTIR), Powder X-ray diffraction (PXRD), elemental analysis and UV–vis Spectra. The solid-state emission spectra of 1 and 2 have been carried out and exhibit emission peaks at 452 nm (λ ex = 364 nm) and 455 nm (λ ex = 371 nm), respectively. Remarkably, CPs 1 and 2 exhibit excellent luminescent emissions in solid-state. Furthermore, CP 1 was used to detect Fe3+ and Cr 2 O 7 2− in aqueous solution, and its sensitivity and anti-interference were also studied. The Stern-Volmer constant K sv were 4.381 × 103 M−1and 1.1109 × 104 M−1, respectively. Further analysis showed that the quenching of CP 1 might be related to the energy competition of Fe3+ and Cr 2 O 7 2−. [ABSTRACT FROM AUTHOR]

A new 2D Co-MOF was synthesized under solvothermal conditions and can act as multi-responsive luminescent probe to detect Fe3+, Cr 2 O 7 2−, CrO 4 2− and nitrofurantoin (NFT) in aqueous solution with high sensitivity, selectivity, and low detection limits. Furthermore, the title complex displays excellent photo-catalytic properties for methylene blue (MB) and Rhodamine B (RhB) in aqueous solution. [Display omitted] A stable 2D Co coordination polymer [Co(DCB)(BIMBP)] n (1) was advisably designed and synthesized (H 2 DCB and BIMBP are 1,1′-di(p -carbonylbenzyl)-2,2′-biimidazoline and 4,4′-bis(imidazol-1-ylmethyl)biphenyl). Profiting by the excellent luminescence performance and high stability in water, complex 1 is a latent multi-functional fluorescent probe toward Fe3+, Cr 2 O 7 2− and CrO 4 2−, and nitrofurantoin (NFT) in aqueous medium. The quenching constant (K SV) values of complex 1 are 1.56 × 104 M−1 for Fe3+, 1.45 × 104 M−1 for Cr 2 O 7 2−, 1.19 × 104 M−1 for CrO 4 2−, and 4.80 × 103 M−1 for NFT, respectively. Furthermore, complex 1 is an effective and stable photocatalyst and displays outstanding photocatalytic degradation of Rhodamine B (RhB) and methylene blue (MB) in water solution. The maximum degradation rate can reach 91.3 % for MB and 90.6 % for RhB in 80 min. [ABSTRACT FROM AUTHOR]

• A Eu3+ functionalized luminescent metal-organic framework was synthesized. • Eu@Gd-BTC-0.03 showed splendid selectivity for detecting acetone and Fe3+ in water. • Eu@Gd-BTC-0.03 had a low LOD and good concentration linear fit for detecting Fe3+. The detection of Fe3+ ions and acetone in aqueous solution is an important issue in human health and environmental monitoring. In this work, the novel lanthanide metal organic framework (Eu@Gd-BTC-x, x = 0.01, 0.03, 0.05 and 0.07) with excellent luminescence property and stability has been synthesized through in-situ functional Eu3+ ions to partially substitute the metal sites (Gd3+) of Gd-BTC. The luminescent detection experiment revealed that the Eu@Gd-BTC-0.03 exhibited a unique concentration quenching effect to Fe3+ and acetone in water, the results also proved the Eu@Gd-BTC-0.03 had excellent selectivity for Fe3+ among a series of metal ions in aqueous solution with a low detection limit of 6.8 × 10−6 M and high linear fit. Besides, the luminescent selective quenching mechanism of the Eu@Gd-BTC-0.03 is attributed to the energy absorption competition between the luminescence center (Eu3+) and the acetone or Fe3+ ions. Consequently, the Eu@Gd-BTC-0.03 would be employed as a potential luminescent sensor for detecting Fe3+ ions in the future. [Display omitted] [ABSTRACT FROM AUTHOR]

Two 2D metal-carboxylate layers with different mesh size are pillared by a bis-pyridyl-bis-amide linker to construct two 4-fold and 3-fold interpenetrating pillared-layer networks, demonstrating multi-responsive sensitivity towards nitroaromatics, Cr 2 O 7 2−, MnO 4 − and PO 4 3− anions. [Display omitted] • Two 3-fold and 4-fold interpenetrating pillared-layer networks (1 and 2) were constructed. • The two frameworks demonstrated multi-responsive luminescent sensitivities. Specially, 2 represents a rare example of multi-functional luminescence sensor for Cr 2 O 7 2−, MnO 4 − and PO 4 3− anions. • The diverse luminescence mechanisms (turn off and turn on) were studied and discussed. Combining Zn(II) with two dicarboxylic acids of different length and functional groups results in the 2D metal-carboxylate layer of different size and shape, which are further connected by the same bis-pyridyl-bis-amide pillar to afford two 4-fold and 3-fold interpenetrating pillared-layer networks (1 and 2). Luminescent properties of 1 and 2 have been systematically investigated and demonstrated multi-responsive luminescent sensitivities. 1 can be used for highly sensitive detection of nitroaromatics. In particular, 2 can be used turn-off sensing towards Cr 2 O 7 2− and MnO 4 − anions as well as turn-on sensing towards PO 4 3− anion in aqueous solution with high sensitivity and remarkable recyclability. The sensing mechanism is also discussed. [ABSTRACT FROM AUTHOR]

Coordination compounds offer a special platform for the development of solid state luminescent materials. Herein, a zinc-based coordination polymer with blue light emission, [Zn(cpp) 2 ] n (1), was successfully prepared through the reaction of the Hcpp linker and Zn2+ with d10 configuration under hydrothermal conditions (Hcpp = 1-(4-carboxyphenyl)-3-(pyrazin-2-yl)pyrazole). Compound 1 was characterized by single crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, infrared spectra, and thermogravimetric analysis. Single crystal X-ray diffraction indicates that compound 1 is composed of one four-coordinated Zn2+ and two kinds of cpp− anions with different conformations and displays a one-dimensional chain structure in which 26-membered rings that are perpendicular to each other are linked by shared Zn2+ ions. Luminescence experiments show that compound 1 has apparent blue light emission and can be regarded as a multifunctional luminescent sensor to detect aniline, Fe3+, CrO 4 2− and Cr 2 O 7 2− through fluorescence quenching. The limit of detections of aniline, Fe3+, CrO 4 2− and Cr 2 O 7 2− are 2.15 × 10−7 M, 1.09 × 10−7 M, 4.86 × 10−7 M, and 2.57 × 10−7 M, respectively, and the corresponding fluorescence quenching mechanism is investigated in detail. Compound 1 showing apparently blue light emission can be used as a multifunctional fluorescence probes to detect aniline, Fe3+, CrO 4 2− and Cr 2 O 7 2− through fluorescence quenching. [Display omitted] [ABSTRACT FROM AUTHOR]

The study of metal-organic frameworks (MOFs) as luminescence sensors for the detection of polluting molecules and ions are of great importance to the health of all creatures in the world. In this research field, lanthanide ions, especially for Eu3+ and Tb3+, have intrinsic advantages based on their outstanding luminescent properties. To develop smart luminescence sensors towards heavy metal ions and acid anions, two new lanthanide(III)-based MOFs: {[Ln 2 (btpdc) 3 ·DMF·2H 2 O]·2DMF·4H 2 O} n (Ln ​= ​Eu (1), Tb (2), H 2 btpdc ​= ​benzo[ b ]thiophene-2,6-dicarboxylic acid) were designed and synthesized under solvothermal condition based on a dicarboxylate ligand H 2 btpdc. Single crystal X-ray diffraction tests show the two complexes are isostructural with three dimensional (3D) porous framework structure. Notably, both of them exhibit good chemical stability in water. Under the excitation of ultra-violet light, 1 can exhibit strong Eu3+-based red light emission in both solid state and aqueous suspension while 2 doesn't show observable luminescence emission. The luminescence sensing experiments performed on 1 reveal that it can be employed as a smart "turn-off" luminescence sensor for the detection of Fe3+ or S2− in aqueous solution with high selectivity, low detection limit, good anti-interference ability and recyclability. The obtained quenching constant K sv and detection limits are 2.316 ​× ​104 ​M−1 and 0.26 ​μM, respectively, for Fe3+, and 1.38 ​× ​104 ​M−1 and 1.05 ​μM, respectively, for S2−. Based on a sulfur-contained ligand, a Eu3+ MOF was synthesized which exhibits high performance in luminescence sensing of Fe3+ and S2− in aqueous solution with host-guest interaction. [Display omitted] • Two new lanthanide metal-organic frameworks are synthesized and fully characterized. • The two MOFs have a short synthesis period of 4 ​h. • The two MOFs show high thermal stabilities and are stable to water. • Eu-MOF is a smart luminescent sensor for Fe3+ or S2− detection. [ABSTRACT FROM AUTHOR]

In this paper, a new post-functionalized nano-platform of Tb3+@UiO-66-DPA had been synthesized and characterized by FTIR spectra, PXRD, SEM, TGA and XPS. With the multi-functionalized nano-platform of Tb3+@UiO-66-DPA, the selective detection and identification of two typical simulants (diethyl chlorophosphate, DCP, and 2-chloroethyl ethyl sulfide, CEES) of chemical warfare agents (nerve agents and mustard gas) had been realized. DCP sensitized and enhanced the 'antenna effect' of Tb3+@UiO-66-DPA through the inhibition of non-radiative deactivation vibrational energy transfer pathways, and the quantitative assay of CEES was achieved through the new Cu2+-mediated luminescent assay method. This study would provide a reliable and effective methodology to detect nerve agent and mustard gas simulants simultaneously via the excellent multi-functional lanthanide nano-materials platform. [Display omitted] • A novel luminescent probe base on Tb3+ post-functionalized UiO-66-DPA was synthesized. • The probe could be as an multi-functional luminescent platform for simultaneous detecting nerve agent and mustard gas simulants. • The probe adopted a new Cu2+-mediated method to realize the quantitative analysis of mustard gas simulant CEES. [ABSTRACT FROM AUTHOR]

[Display omitted] • A luminescent MOF {[Eu 2 L 3 (H 2 O) 5 ] 2 ·3DMF} n was synthesized under solvothermal reactions, the structure was characterized and analyzed. • Fluorescent sensing demonstrates that the complex has high sensitivity and sensitivity for both nitro-aromatic compounds TNP and 4-NP. • The detection mechanisms were studied based on both experiments and calculation. A new 3D metal-organic framework (MOF), {[Eu 2 L 3 (H 2 O) 5 ] 2 ·3DMF} n (1) has been successfully synthesized via 2-amino-4,4′-biphthalic acid (H 2 L) and Eu(NO 3) 3 ·4H 2 O by using solvothermal method. For complex 1 , the carboxylates bridged two kinds of ions to form double rope one-dimensional chain [Eu(COO) 3 ] n , the adjacent one-dimensional chains are connected to generate three-dimensional structure by adjacent ligands. Luminescent sensing experiments revealed 1 can efficiently detect 4-nitrophenol (4-NP) and 2, 4, 6-trinitrophenol (TNP) with excellent sensitivity and selectivity. Additionally, the detection mechanism for these nitro aromatic compounds was further explored by calculations and experiments. [ABSTRACT FROM AUTHOR]

Using 4'-(4′-pyridyl)-2,2':6′,2″-terpyridine (PYTPY) and 3,5-bis-(3-carboxy-benzyloxy)-benzoic acid (H 3 bcb) as ligands and transition metals cadmium (II) and iron (III) synthesized two metal organic frameworks [Cd(H 2 bcb) 2 (PYTPY)] (1) and [Fe(H 2 bcb) 2 (PYTPY)]n (2). The structure was confirmed and characterized by single crystal X-ray diffraction and elemental analysis. The structure analysis shows that complexes 1 and 2 are further connected through π-π interactions and hydrogen bonds to form a 3D supramolecular network. In addition, complex 1 shows high sensitivity to Fe3+, Cr 2 O 7 2− and nitrobenzene in solutions containing mixed metal ions, anionic groups and aromatic compounds. Which makes it be a promising crystalline material as luminescent probe to Fe3+ Cr 2 O 7 2− and nitrobenzene. This property makes complex 1 a potential fluorescence sensor for these chemicals. The present investigation clearly demonstrates selective, recyclable detection of lethal environmental pollutants such as Fe3+, Cr 2 O 7 2− and NB in aqueous media which has relevance in the context of environmental protection and homeland security. Moreover, complex 2 exhibits weak antiferromagnetic interactions at low temperature. It lays a good foundation for the future research and design of molecular based magnets. Using 4'-(4′-pyridyl)-2,2':6′,2″-terpyridine (PYTPY) and 3,5-bis-(3-carboxy-benzyloxy)-benzoic acid (H 3 bcb) as ligands and transition metals cadmium (II) and iron (III) synthesized two metal organic frameworks [Cd(H 2 bcb) 2 (PYTPY)] (1) and [Fe(H 2 bcb) 2 (PYTPY)]n (2). The structure analysis shows that complexes 1 and 2 are further connected through π-π interactions and hydrogen bonds to form a 3D supramolecular network. In addition, complex 1 shows high sensitivity to Fe3+, Cr 2 O 7 2− and nitrobenzene in solutions containing mixed metal ions, anionic groups and aromatic compounds. Moreover, complex 2 exhibits weak antiferromagnetic interactions at low temperature. [Display omitted] • We report a facile method for the preparation of Cd-LMOFs. • The construction by design of MOFs using bifunctional organic ligands connected through coordination bonds. • The high selectivity and sensitivity of the fluorescence response of MOFs to Fe3+ ions Cr 2 O 7 2− and NB molecules. • Fe-MOFs exhibits weak antiferromagnetic interaction at low temperature. [ABSTRACT FROM AUTHOR]

Sialic acid (SA) is overexpressed on cell membranes of tumor cells, and increased serum SA concentration has been observed in tumor-bearing patients. Herein, a series of lanthanide-containing bimetallic complexes (TDA-M-Lns) for targeting SA were prepared via coordination among luminescent lanthanide ions (Ln 3+ = Tb 3+ , Eu 3+ , Dy 3+ , or Sm 3+ ), metal ion quenchers (M 2+ = Cu 2+ or Co 2+ ), and the organic ligand 2,2'-thiodiacetic acid (TDA). SA can competitively coordinate with Ln 3+ , resulting in the "signal-on" of the Ln 3+ . Therefore, the TDA-M-Lns can be simply used for cost-saving detection of SA in the blood samples. Among the TDA-M-Lns, TDA-Co-Eu showed the highest sensitivity to detect SA in the blood of tumor-bearing mice. Furthermore, the TDA-Co-Eu was successfully used to target SA and deposit Eu 3+ on the surfaces of tumor cells for the inhibition of tumor cell growth and migration. The therapeutic effect of TDA-Co-Eu on a Balb/c mouse liver tumor model was evaluated. It was proved that TDA-Co-Eu can be applied for SA detection as well as for inhibiting tumor growth.

Nitroaromatic compounds (NACs) are considered as a kind of toxic chemicals that pose a serious danger to the survival of animals and humans. Therefore, it is of great significance to develop an efficient and rapid method for detecting nitroaromatic explosives. Up to now, fluorescence metal-organic framework (MOF) has been widely used to detect NACs in environmental pollutants because of their many active sites and bare functional groups. In this work, we have synthesized a cationic Zn-based MOF (called F1) based on bis-(imidazole) ligands with the formula of [Zn 3 (TIAB) 2 (IMDC) 2 ]·(NO 3) 2 ·(DMF) 2 ·(H 2 O) 2 (TIAB = [(1,2,4,5-tetra(1H-imidazole-1-yl)benzene)], IMDC = 4,5-imidazoledicarboxylic acid, DMF = N,N-Dimethylformamide). Crystal structure analysis reveals that F1 possesses a three-dimensional (3D) framework with (4,8)-coordinated network. TIAB linkers connect the Zn(II) atoms to construct a 2D network, the deprotonation of the hydroxyl groups on the two carboxyl groups of the IMDC ligand, and the protonated IMDC2− dangling fills the channel connected to two Zn1 atoms and one Zn2 atom, which are further connected TIAB ligands to form a 3D cationic framework. The results reveal that, compared with nitro aliphatic and aromatic compounds, the solvent-free F1 is highly sensitive and has excellent selectivity for nitroaromatic explosives, especially for 2,4,6-trinitrophenol (TNP). The quenching efficiency of TNP is as high as 91.67% (K sv = 56760 M−1, LOD = 0.78 μM). The solvent-free F1 can be reused at least five times, and the response time to TNP is less than 30 s. The sensing and detection mechanisms of the solvent-free F1 to various NACs have been studied in detail. Finally, the response of solvent-free F1 to a variety of NACs was analyzed by density functional theory. [Display omitted] • A cationic Zn-based MOF shows good selectivity and sensitivity to nitroaromatic compounds. • Distinguish between nitroaromatic and nitro aliphatic compounds. • F1 can quickly detect TNP within 30 s and cycle five times to maintain the stability of the structure. • Reveal a variety of detection mechanisms through experiments and theoretical calculations. [ABSTRACT FROM AUTHOR]

Excessive release of inorganic and organic hazardous chemical pollutants have posed a great threat to public health and human sustainable development. Therefore, the detection of these hazardous chemicals become very important but challenging. In this work, a methyl-decorated acylamide-containing dicarboxylate ligand H 2 L was designed and synthesized. By using H 2 L and bpp ligands reacted with Cd(II) ions, a new coordination polymer {[Cd(L)(bpp)]⋅DMF⋅2H 2 O} n (1) was solvothermally synthesized and characterized. Single-crystal X-ray diffraction suggests that 1 features an interesting 3-fold parallel interpenetrated structure based on three 2D sql layers through π-π and C H⋅⋅⋅π interactions, in which the uncoordinated acylamide groups are found and facilitate 1 to recognize analyte molecules. Complex 1 shows good water stability and luminescent property. The luminescent sensing experiments show that 1 could serve as a multi-responsive luminescent sensor for sensitive, selective and recyclable detecting Fe3+, Cr 2 O 7 2− and furazolidone (FZD) in aqueous solution. The corresponding luminescent quenching mechanisms have also been discussed. Furthermore, complex 1 was successfully applied to determine Fe3+, Cr 2 O 7 2− and FZD in real water samples. [ABSTRACT FROM AUTHOR]

Three Co(II)/Zn(II) CPs have been synthesized under solvothermal conditions and complex 2 can act as multi-responsive luminescent probe to detect the Fe3+ cation, Cr 2 O 7 2− anion and nitrofuran antibiotic (NZF) in aqueous media with high sensitivity, selectivity and low detection limits. [Display omitted] Three coordination polymers (CPs), namely {[Co(L)(dpa)]·H 2 O} n (1), {[Zn(L) 2 (dpb)]} n (2) and {[Zn(L)(dpe)]} n (3), have been assembled through a dual-ligand strategy of a semi-rigid dicarboxylic acid (H 2 L = 1,4-bis(4-phenoxy)benzenedicarboxylic acid) with the help of different N -donor co-ligands (dpa = di(pyridin-4-yl)amine, dpb = 1,4-di(pyridin-4-yl)benzene), dpe = trans -1,2-di(4-pyridyl)ethylene). Single crystal X-ray diffraction analyses reveals that compound 1 is a 4-fold interpenetrating 2D sql network and compound 2 is a 2-fold interpenetrating 2D sql network, although the final structures are different because of various inter-layer stacking modes. Compound 3 is a 8-fold interpenetrating 3D dia framework containing an octahedral cage. A photoluminescence investigation shows that compounds 2 and 3 exhibit strong fluorescence originating from the intra-ligand charge transfer transitions. Benefiting from its chemical stability and luminescent properties, compound 2 possesses multi-functional fluorescent responses toward the Fe3+ ion, the Cr 2 O 7 2− ion and the NZF antibiotic in aqueous medium. The K SV values of compound 2 are 4.68 × 104 M−1 for the Fe3+ ion, 7.23 × 104 M−1 for the Cr 2 O 7 2− anion, and 1.03 × 104 M−1 for the NZF antibiotic. Additionally, the possible mechanism for the luminescence quenching has been investigated. [ABSTRACT FROM AUTHOR]

A 18-metal Yb(III) nanoring was constructed by the using of a Schiff base ligand. It exhibits interesting NIR luminescent sensing behavior to antibiotics and explosives, in particular to NFAs and TNP with high sensitivity. The K SV values and LODs of this lanthanide nanoring to NFAs and TNP are 1.5 × 104–4.6 × 104 (mol/L)−1 and 1.7–5.1 μmol/L, respectively. Its high luminescence sensitivities to NFAs and TNP are not affected by the existence of other antibiotics and explosives. [Display omitted] • The complex shows a ring-like structure. • The complex displays typical NIR lanthanide luminescence. • The complex exhibits NIR luminescence response to antibiotics and explosives. [ABSTRACT FROM AUTHOR]

Metal-organic frameworks (MOFs) constructed from a rich library of organic struts and metal ions/clusters represent promising candidates for a wide range of applications. The unique structure, porous nature, easy tunability and processability of these materials make them an outstanding class of materials for tackling serious global problems relating to energy and environment. Among them, environmental pollution is one aspect that has increased at an alarming rate in the past decade or so. With rapid urbanization and industrialization, toxic environmental pollutants are constantly released and accumulated leading to serious contamination in water bodies and thereby having adverse effects on human health. Recent studies have shown that many toxic pollutants, as listed by the World Health Organization and the US Environmental Protection Agency, can be selectively detected, captured, sequestered and removed by MOFs from air and aquatic systems. Most of these sensing/capture processes in MOFs are quantifiable and effective for even a trace amount of the targeted chemical species. The functional sites (ligands and metals) play a critical role in such recognition processes and offer an extensive scope of structural tunability for guest (pollutants, toxic entities) recognition. Whereas on the one hand, the underlying mechanisms governing such sensing and capture are important, it is also crucial to identify MOFs that are best suited for commercial applications for the future. In this review article, we provide an overview of the most recent progress in the sensing, capture and removal of various common toxic pollutants, including neutral and ionic, inorganic and organic species, with brief discussions on the mechanism and efficacy of selected MOFs., (© The Author(s) 2022. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.)