Search

Thymic lymphoepithelioma-like carcinoma (LELC) is a rare primary malignant neoplasm originating from the thymus. Thymic LELC diagnosis is often terminal when diagnosed, some patients have lost the opportunity for surgery. Platinum- and anthracycline-based systemic chemotherapy are the first-line treatment plan; however, there is no clear consensus on therapy when first-line treatment fails because of the lack of cases of advanced thymic LELC. Here was a rare case of advanced thymic LELC with bone marrow metastasis at relapse, which is reported in a patient who responded well to toripalimab combined with anlotinib therapy. The treatment showed tolerable toxicity with good antitumor activity in the patient. As far as we know, this is the first case that the combination of toripalimab with anlotinib is effective in controlling advanced thymic LELC with bone marrow metastasis. The case reports represent an essential means by which an effective therapy for advanced thymic LELC may not be practical given the low frequency of a thymic LELC with multiple metastases.

A 2D fluorescent coordination polymer, {[Zn(L)0.5(mip)] 1.75H2O}n (1), was successfully assembled. 1 was developed as an ultrasensitive fluorescent probe for the sensing of norfloxacin (NOR) in water.

Selective detection of antibiotics and MnO4− is crucial for human health improvement and protecting the environment. Two stable Zn(II)-based metal–organic frameworks (MOFs) {[Zn6(L1)2(NDC)5(μ2-OH)2]·0.5H2O}n (1), and {[Zn(L2)(NDC)]·2H2O}n (2) (H2NDC = 1,4-naphthalenedicarboxylic acid, L1 = 1,5-bis(1-(pyridine-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)pentane, L2 = 1,6-bis(1-(pyridine-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)hexane) were successfully synthesized by adopting the mixed ligands approach. 1 is a rare 3D 3,5,6T23 framework based polynuclear complex group. 2 possesses a 2D sql layer. The two MOFs exhibit excellent chemical and thermal stability. The title compounds are promising dual-functional fluorescent sensors for detecting enrofloxacin/MnO4− anions with high selectivity and sensitivity (Ksv values toward enrofloxacin: 4.29 × 106 L mol−1 for 1 and 4.59 × 106 L mol−1 for 2 and toward MnO4−: 1.05 × 104 for 1, 5.48 × 103 L mol−1 for 2, respectively), which are the first observations of fluorescent MOFs for the sensing of enrofloxacin and MnO4− anions.

Four new d10 metal-organic frameworks (MOFs), named {[Cd(L)(TPA)]}n (1), {[Zn3(L)(BTC)2]}n (2), {[Zn(L)(1,4-NDC)]·2H2O}n (3), and {[Cd(L)(1,4-NDC)]·1.5H2O}n (4) (L = 1,6-bis(1-(pyridine-4-ylmethyl)-1H-benzo[d]imidazole-2-yl)hexane, H2TPA = terephthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid, 1,4-H2NDC = 1,4-naphthalene dicarboxylic acid), are successfully synthesized by hydrothermal method and further characterized. 1 can be simplified into a dia framework, an unusual 4-nodal 3,4,4,6-topology of 2 was deposited into the TopCryst database as cgh8, 3–4 are simplified to 2D sql networks. 1–4 exhibit chemical stability, which are stable in a wide pH range from 3 to 12. The sensing of the oxytetracycline/nitrofurazone and Fe3+ ions display the selectivity, sensitivity, and reusability of 1‒4. Moreover, the mechanism of luminescence quenching is also investigated as photo-induced electron transfer and Förster resonance energy transfer. published

Two new Co(II) complexes, namely [Co2(L1)(TBIP)·H2O]n (1) and [Co2(L2)(NPTA) H2O]n (2) (L1 = 1,4-bis(thiabendazole-1-ylmethyl)benzene, L2 = 1,2-bis(thiabendazole-1-ylmethyl)benzene, H2TBIP = 5-tert-butylisophthalic acid, and H2NPTA = 2-nitroterephthalic acid), were hydrothermally synthesized and characterized. 1 shows a 1D double chain, while 2 displays a binuclear structure. 1 and 2 extend into a 2D supramolecular network via C−H···O and O−H···O hydrogen bonding interactions, respectively. 1 and 2 exhibit excellent chemical stability in a wide pH range of 3−12. Furthermore, 1 and 2 are promising di-functional sensors for the detection of Fe3+/Cr2O72− (pH = 4) and Ni2+/MnO4− (pH = 9), respectively, with high sensitivity and selectivity and a low limit of detection.

Two new ternary Cd(II) coordination polymers (CPs), [Cd2(L)(mip)2·2H2O]n (1) and {[Cd2(L)(hip)2]·3.5H2O}n (2) (L = 1,4-bis(thiabendazol-1-ylmethyl)benzene, H2mip = 5-methylisophthalic acid, H2hip = 5-hydroxyisophthalic acid), have been synthesized and characterized by physicochemical and spectroscopic methods. 1 possesses a 1D chained structure while 2 exhibits a 2D hcb layer. Both CPs can be further extended into 2D/3D supramolecular frameworks via π–π stacking interactions. Both 1 and 2 can serve as dual-responsive luminescent probes for the selective detection of benzaldehyde (BZH) and permanganate anions (MnO4−) in aqueous system. The limits of detection (LODs) of 1 for BZH and MnO4− are 0.13 µM and 0.21 µM, separately, whereas the LODs of 2 for BZH and MnO4− are 1.30 µM and 1.95 µM, respectively.

Four new Zn(II) metal–organic frameworks (MOFs): {[Zn(L1)(BTEC)0.5]·3.1H2O}n (1), {[Zn(L2)0.5(BTEC)0.5]·1.5H2O}n (2), {[Zn2(L3)(BTEC)(H2O)]·H2O}n (3), and {[Zn2(L4)(BTEC)]·H2O}n (4) were constructed by selecting N-containing linkers with the Zn(II)/H4BTEC system (H4BTEC = 1,2,4,5-benzenetetracarboxylic acid, L1 = 1,4-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)cyclohexane, L2 = 1,4-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)butane, L3 = 1,5-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)pentane, L4 = 1,4-bis(1-(pyridin-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)methyl)benzene). Structural analyses indicate that 1 exhibits a (3,4)-connected 2D 3,4L13 sheet. 2 manifests a rare (4,4,4)-connected 2D 4,4,4L10 layer. 3 displays an unprecedented (3,3,4,4,4)-connected 3D network based on the point symbol {4·82}2{42·6·83}2{42·6}2{42·82·102}{84·122} and 4 presents an unusual 4,4,4,6,6T3 3D network with a 5-node (4,4,4,6,6)-connected network. The structural variety of these Zn(II) MOFs demonstrates that different N-containing ligands can induce the BTEC4− linkers exhibiting various coordination modes, exerting a great influence on the final MOF frameworks. Further, MOFs 1–4 are favorable dual-functional fluorescent sensors for the detection of Fe3+/acetylacetone with high sensitivity and selectivity. To our knowledge, this is the first report of fluorescent MOFs based on L1–L4 ligands for the detection of Fe3+ and acac in the naked eye range.

Two luminescent Cd(II)–organic frameworks [Cd2(L1)(tdc)2(H2O)]n (1) and [Cd(L2)0.5(tdc)]n (2) (L1 = 1,5-bis(1-(pyridine-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)pentane, L2 = 1,6-bis(1-(pyridine-4-ylmethyl)-1H-benzo[d]imidazol-2-yl)hexane, and H2tdc = 2,5-thiophenedicarboxylic acid) were hydrothermally synthesized and characterized. 1 displays a rare binodal (3,4)-connected 2D cem-d network, while 2 exhibits a 3D mog (moganite) framework. The two MOFs are highly thermally durable and water-stable in a wide pH range from 3 to 12. Interestingly, 1 and 2 represent the first reported examples of multi-responsive probes based on MOFs for selectively detecting levofloxacin, benzaldehyde, and Fe3+ ions with reusability. The luminescence sensing mechanisms of the two CPs were explored in detail.

There has been broad attention to the recognition and detection of ions and organic small molecules due to their essential roles in environmental systems. However, dual-functional probes have seldom been developed for sensing organic constituents and lanthanide ions. A new 3D pillared Zn(II)−organic framework [Zn3(L)(DCTP)3]n (1) (L = 1,4-di(1H-benzo[d]imidazol-2-yl)butane and H2DCTP = 2,5-dichloroterephthalic acid) was hydrothermally synthesized and structurally characterized, and features a unique 3D 4,4,4,6-connected framework containing approximately 9.99 × 9.78 A2 cubic channels. 1 displays excellent thermal and pH stability and can act as a novel “turn-on” fluorescent probe for highly selectively sensitizing Tb3+ ions through an “antenna effect”. Furthermore, 1 is a dual-response fluorescent sensor for monitoring acetylacetone and Tb3+ ions with rapid response times (within 1 min), low limits of detection (LOD) (5.02 × 10−6/1.15 × 10−8 M, separately) and great anti-interference ability and recyclability towards the analytes. The related sensing mechanisms for detecting analytes are also investigated in detail.

Two new Co(II) coordination compounds, namely [Co(L)0.5(DCDPE)]n (1) and [Co(L)(npth)]n·nH2O (2) (L = 1,1′-(1,6-hexanediyl)bis[2-(2-pyridyl)benzimidazole], H2DCDPE = 4,4′-dicarboxydiphenyl ether, H2npth = 3-nitrophthalic acid), were hydrothermally prepared and characterized. 1 presents a 2D layered 3,4L83 network, while 2 exhibits a dinuclear structure. Both complexes possess high pH stabilities in the range from 3 to 12. 1 and 2 can serve as fluorescence probes to sense acetylacetone (acac), levofloxacin (LEV), and Ni2+ with high quenching constants and low detection limits. The fluorescence sensing mechanisms of 1 and 2 are discussed in detail.

Combination of three aromatic carboxylic acids (5-nitroisophthalic acid (H2nip), 2,6-naphthalenedicarboxylic acid (H2ndc), tetrabromoterephthalic acid (H2tbta)) and flexible bis(benzimidazole) derivatives (1,6-bis(2-methylbenzimidazol-1-yl)hexane (L1), 1,2-bis(2-methylbenzimidazol-1-ylmethyl)benzene (L2), 1,4-bis(2-methylbenzimidazol-1-yl)butane (L3)), three co-crystals [(H2L1)2+·2(Hnip)−·H2O] (1), [(L2)·(H2ndc)] (2) and [(H2L3)2+·(tbta)2−] (3) were synthesized hydrothermally. Single-crystal X-ray diffraction, elemental analysis and IR spectra are employed to characterize 1, 2 and 3. The 2D fingerprint plots and Hirshfeld surfaces of 1, 2 and 3 indicate that the 3D supramolecular network for 1 was generated by N–H···O, O–H···O, C–H··O hydrogen bonds and π−π interactions, the 2D sheet for 2 was produced by O–H···N hydrogen bonds and π−π interactions, and C–H···O hydrogen bonds make structures more stable. For 3, the 2D supramolecular layer was yielded by N–H···O, C–H···O hydrogen bond interactions. Furthermore, thermogravimetric analyses and photoluminescence properties of three compounds were presented.

Three new ternary cobalt(II)-coordination polymers containing isomers of bis(benzimidazole) linkers, namely, [Co(TBTA)(L1)2]n (1), [Co(TBTA)(L2)2]n (2) and [Co(TBTA)(L3)1.5]n (3) (L1 = 1,2-bis(benzimidazol-1-ylmethyl)benzene, L2 = 1,3-bis(benzimidazol-1-ylmethyl)benzene, L3 = 1,4-bis(benzimidazol-1-ylmethyl)benzene, H2TBTA = tetrabromoterephthalic acid) were hydrothermally synthesized and characterized. 1 exhibits a 3D uninodal pcu framework, 2 possesses a hcb layer and 3 is a 1D chain structure. 1, 2 and 3 are highly sensitive and selective luminescent chemosensors for detection of acetylacetone, benzaldehyde and Cr2O72− anions in water.

Two new water-stable cadmium(II)-metal organic frameworks (MOFs), namely [Cd2(L1)(1,4-NDC)2]n (1) and [Cd(L2)(1,4-NDC)]n (2) (L1 = 1,4-bis(benzimidazol-1-yl)-2-butylene, L2 = 1,4-bis(2-methylbenzimidazol-1-yl)-2-butylene and 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid), were synthesized and characterized. 1 exhibits an unusual 3D framework with the Schlafli symbol of {42·5·62·7}{42·52·72}{42·53·62·73}2, and 2 is a classical sqc6 network. 1 and 2 display excellent pH and water stability, and the integrity of the frameworks was well maintained at different pH values (pH = 3–13) and after long-term water treatment. 1 is the first dual-function luminescent sensor for sensing acetylacetone and Cr2O72− in aqueous solutions with high sensitivity, selectivity and excellent recyclability. This material is an excellent dual-responsive recyclable luminescent sensor.

Three water-stable 2D cadmium(II)-coordination polymers (CPs), namely {[Cd(MIP)](L)·1.35H2O}n (1), [Cd(NTP)(L)]n (2) and [Cd(1,4-NDC)(L)]n (3) (L = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)propane, H2MIP = 5-methylisophthalic acid, H2NTP = 2-nitroterephthalic acid and 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid), were synthesized and characterized. 1 exhibits a 3,4L83 framework, 2 is a 3,5L2 network and 3 exhibits a rare 3,4-connected 3,4L27 network. 1 and 3 are dual-function luminescence sensors for sensing Cr2O72− (pH = 3.0)/CrO42− (pH = 13.0) in aqueous solution with high sensitivity, selectivity and excellent recyclable behaviors.

Two new Cd2+ coordination polymers (CPs), namely {[Cd(L)(1,4-PDA)]·0.7(C2H5OH)}n (1) and {[Cd(L)0.5(1,8-NDC)·H2O]}n (2) [L = 1,4-bis(5,6-dimethybenzimidazol-1-yl)-2-butene, 1,4-H2PDA = 1.4-phenylenediacetic acid, 1,8-H2NDC = 1,8-naphthalenedicarboxylic acid], were hydrothermally synthesized and characterized. 1 is a (4,4)-layered structure and further extended into a 3D supramolecular network via π–π stacking interactions. 2 features a 2D (3,4)-connected 3,4L83 framework. 1 and 2 can act as luminescence sensors for detecting acetylacetone (acac) and Fe3+ with high sensitivity, selectivity and recyclability. This is the first dual fluorosensors employing CPs for the detection of Fe3+ and acac. The mechanism for the luminescent sensing of acac and Fe3+ was suggested.

Two luminescent Cd(II)-organic frameworks [Cd

There has been broad attention to the recognition and detection of ions and organic small molecules due to their essential roles in environmental systems. However, dual-functional probes have seldom been developed for sensing organic constituents and lanthanide ions. A new 3D pillared Zn(ii)-organic framework [Zn3(L)(DCTP)3]n (1) (L = 1,4-di(1H-benzo[d]imidazol-2-yl)butane and H2DCTP = 2,5-dichloroterephthalic acid) was hydrothermally synthesized and structurally characterized, and features a unique 3D 4,4,4,6-connected framework containing approximately 9.99 × 9.78 Å2 cubic channels. 1 displays excellent thermal and pH stability and can act as a novel "turn-on" fluorescent probe for highly selectively sensitizing Tb3+ ions through an "antenna effect". Furthermore, 1 is a dual-response fluorescent sensor for monitoring acetylacetone and Tb3+ ions with rapid response times (within 1 min), low limits of detection (LOD) (5.02 × 10-6/1.15 × 10-8 M, separately) and great anti-interference ability and recyclability towards the analytes. The related sensing mechanisms for detecting analytes are also investigated in detail.

A cobalt(II) coordination polymer with an unusual 4,4,4-connected network was hydrothermally synthesized and observed with high thermal, solvent, and pH stabilities. This polymer can serve as the first dual-responsive fluorescent chemosensor for the selective detection of acetylacetone and Cr2O72- ion (pH 3.0) in aqueous systems.

Two new Ni(II) coordination polymers (CPs) [Ni(TP)(L1)(H2O)]n (1) and [Ni(TP)(L2)]n (2), were synthesized via hydrothermal reaction (H2TP = terephthalic acid, L1 = 1,6-bis(2-methylbenzimidazol-1-yl)hexane, L2 = 1,6-bis(5,6-dimethylbenzimidazol-1-yl)hexane, and structurally characterized by X-ray single crystal diffraction analysis, elemental analyses, thermogravimetric analysis, X-ray powder diffraction and IR spectra. CP 1 exhibits a 2D hcb layer, which is further extended into 3D supramolecular architecture by classical O–H⋯O hydrogen-bonding interactions. CP 2 possesses a 3D 4-connected sra framework. Both CPs possess high thermal stability and promising photocatalytic activities for the degradation of methylene blue (MB) under UV irradiation. The photocatalytic mechanism was investigated by introducing benzoquinone (BQ), the ammonium oxalate (AO), and tert-butyl alcohol (TBA) as superoxide radical (·O2−), hole (h+), and hydroxyl radical (·OH) scavengers, respectively.

Two Ag(I) complexes, namely [Ag2(L1)2(HMIP)2·H2O]n (1) and [Ag2(L2)2(HPA)2]n (2) (L1 = 1,6-bis(2-methylbenzimidazol-1-yl)hexane, L2 = 1,6-bis(benzimidazol-1-yl)hexane, H2MIP = 5-methylisophthalic acid, H2PA = phthalic acid), were hydrothermally synthesized and characterized by physicochemical and spectroscopic methods. 1 Processes a binuclear Ag(I) structure which is further extended into a 2D supramolecular network by hydrogen bonds and π–π stacking interactions. 2 Features a 1D meandering chain which is linked into a 3D supramolecular network by Ag···O and π–π stacking interactions. Complex 1 is shown to be a highly sensitive material for luminescence detecting Fe3+ in aqueous solution. These complexes display high photocatalytic activities for degradation of methylene blue under UV irradiation.

Two new difunctional Co(II) coordination polymers (CPs), namely, [Co(TBTA)(L)1.5]n (1) and {[Co(NPHT)(L)]·H2O}n (2) were hydrothermally synthesized from 4,4′-bis(imidazole-1-yl)-biphenyl and different aromatic carboxylic acid ligands (H2TBTA = tetrabromoterephthalic acid, and H2NPHT = 3-nitrophthalic acid). Two CPs feature 2D (3,6)-connected hcb, and (4,4)-connected sql topologies for 1, and 2, respectively. 1 further extends into a three dimensional supramolecular architecture through π···π stacking interactions. Both of CPs exhibit high photocatalytic activities for degradation of methylene blue (MB) with remarkable efficiencies (85.83% for 1, and 93.76% for 2) under natural sunlight irradiation. 1 can sensitively and selectively detect Cr(VI) anions in water media with the Stern-Volmer quenching constant (Ksv) of 4.79 × 104 M−1 for Cr2O72− (pH = 3) or 2.36 × 104 M−1 for CrO42− (pH = 12). The linear detection ranges are 0–350 μM, and 0–200 μM for Cr2O72−, and for CrO42−, severally.

A new ternary zinc(II) coordination polymer [Zn2(bbmb)2(tdc)2]·2H2O (CP 1) 1,4-bis(benzimidazol-1-yl-methyl)benzene(bbmb), 2,5-thiophenedicarboxylic acid (H2tdc) was hydrothermally synthesized and characterized by IR, elemental analysis and powder X-ray diffraction. CP 1 is a 3D 4-connected sra framework with the symbol point of {42,63,8} which possesses high sensitivity and selectivity as luminescence sensor for detected of Hg2+ ions in aqueous solution. Moreover, CP 1 possesses high photocatalytic activities for decomposed methylene blue (MB) under UV light irradiation.

A Co(II)-based ternary coordination polymer with formula {[Co(BTC)0.5(L)(H2O)]·3H2O}n (NCST-2, NCST = North China University of Science and Technology) was constructed from 1,2-bis(thiabendazol-1-ylmethyl)benzene (L) and butane-1,2,3,4-tetracarboxylic acid (H4BTC) under hydrothermal conditions. NCST-2 features a one-dimensional zigzag chain, which is further extended through O H⋯O hydrogen bond and π⋯π stacking interactions into a three-dimensional supramolecular network. NCST-2 exhibits highly selective and recyclable performance for the fluorescence sensing of Fe3+ in aqueous solution with a linear detection range of 0–400 μM and a detection limit of 0.12 μM. NCST-2 displays high photocatalytic activities for degrading methylene blue (MB) under UV irradiation. The possible mechanism of the photodegradation towards MB was investigated in detail.

Two new ternary zinc(II) coordination polymers (CPs), catena-(μ2-phthalato)-(μ2-1,1′-hexane-1,6-diylbis(2-methyl-1H-benzimidazole))-zinc (CP 1) and catena-(μ2-phenylene-1,4-diacetato)-(μ2-1,1′-hexane-1,6-diylbis(1H-benzimidazole))-zinc (CP 2) were synthesized via hydrothermal process. CP 1 and CP 2 are named as [Zn(L1)(PA)]n and [Zn(L2)(PDA)]n (L1 = 1,1′-hexane-1,6-diylbis(2-methyl-1H-benzimidazole), L2 = 1,1′-hexane-1,6-diylbis(1H-benzimidazole), H2PA = phthalic acid, H2PDA = 1,4-phenylenediacetic acid)), respectively. Both CPs were characterized by elemental analysis, infrared spectroscopy, single crystal X-ray diffraction analysis. CP 1 possesses a 4-connected 66-dia network, CP 2 displays a 2D hcb layer with point symbol {63}. UV–Vis diffuse reflection spectra, luminescence and photocatalytic properties of two CPs for the degradation of the methylene blue (MB) dye were investigated. The mechanism of photocatalytic degradation of MB was also suggested.

Two new Mn(II) coordination polymers, namely, [Mn(NDC)(L)(H2O)]n (NCST-3) and {[Mn2(HBTC)2(L)2(H2O)2]·2H2O}n (NCST-4) (L = 1,4-bis(5,6-dimethylbenzimidazole)butane, 1,4-H2NDC = 1,4-naphthalene dicarboxylic acid, and H3BTC = 1,3,5-benzenetricarboxylic acid) (NCST = North China University of Science and Technology) were synthesized and structurally characterized by single crystal and powder X-ray diffractions, elemental analysis, FT-IR spectroscopy and TGA. NCST-3 exhibits 2D 3,5L2 network, whereas NCST-4 possesses an unusual (3,4,5)-connected framework defined by the point symbol of (53)(55.6)(56.62.82). Furthermore, the photocatalytic activities of two complexes were evaluated for the degradation of methylene blue (MB), Rhodamine B (RhB), methyl violet (MV) and methyl orange (MO) under the UV irradiation. Finally, two compounds as probes displayed favorable ion-sensing performance for Cr3+/Ag+ through fluorescence quenching.

Two new Cd(II) coordination polymers, namely {[Cd(L)(tp)]·2H2O}n(1) and {[Cd(L)(5-hip)]·2.66H2O}n (2), where L = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol, H2tp = terephthalic acid and 5-H2hip = 5-hydioxyisophthalic acid, were hydrothermally synthesized and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analyses. 1 possesses a 4,4-connected two-dimensional 4,4L10 network with a point symbol of {32·4·62·7}2{32·62·72}. 2 displays a 3,5-connected three-dimensional 3,5T1 framework with a point symbol of {42·65·83}{42·6}. 1 and 2 attained highly photocatalytic efficiency toward the decomposition of methylene blue (MB) under UV light irradiation. Furthermore, 2 was successfully applied in selective sensing of Fe3+ and Cr2O72- ions with the low detection limit 1.56 × 10−7 M and 2.79 × 10−7 M, respectively.

An unprecedented 3D self-catenated topology with highly connected metal–organic framework, [Cd3(nbta)1.5(btb)2(H2O)]n (1) (H3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, btb = 4,4′-bis(1,2,4-triazol-1-yl)-biphenyl) on the basis of Cd3 clusters was hydrothermally synthesized and characterized. Compound 1 possesses a unique (3,3,9)-coordinated framework, in which the nbta3− ligands serve as two unusual pentadentate and heptadentate coordination modes. Compound 1 exhibits highly photocatalytic activities for the degradation of MB/MO/RhB organic dyes.

A new zinc (II) metal-organic framework, [Zn3(L)2(nbta)2]n (1) (L = 1,4-bis(benzimidazol-1-yl)-2-butene, H3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid) was hydrothermally synthesized and structural characterized. 1 possesses a unique 3D (4,4,5)-connected network with a Schlafla symbol of {42.63.8}2{44.62}{47.63}2. Furthermore, the photocatalytic property of 1 for degradation of the Rhodamine B (RhB) was examined under UV irradiation.

Two Zn(II) coordination polymers (CPs), [Zn (L1) (DCTP)]n (1) and [Zn (L2) (DCTP)]n (2) [L1 = 1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, H2DCTP = 2,5-dichloroterephthalic acid, L2 = 1,4-bis(benzimidazol-1-ylmethyl)benzene] were hydrothermally synthesized and characterized by elemental analyses, IR spectra, thermogravimetric analyses, fluorescence spectra and single-crystal X-ray diffraction. CP 1 forms a 2D (4,4) layered structure, which is finally extended to a 3D supramolecular framework by the π-π stacking interactions. CP 2 possesses a 3D 3-fold interpenetrating dia network. Both CPs can be as highly selective probes for detection of Fe3+ in aqueous solutions based on luminescence quenching. Further, two compounds exhibit photocatalytic activities for degradation of the methylene blue under UV irradiation.

A new multifunctional cobalt(II)-based metal–organic framework, [Co(DCTP)(L)(H2O)2]n (NCST-1, NCST = North China University of Science and Technology), was synthesized by self-assembly of Co(OAc)2·4H2O with 1,4-bis(benzimidazol-1-ylmethyl)-benzene (L) and 2,5-dichloroterephthalic acid (H2DCTP). 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 (H2O2) based on the NCST-1, which was cast-coated on glassy carbon electrode (GCE). The modified sensor exhibited a remarkable performance for H2O2 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 (Ksv) of 1.12 × 104 M−1 and a detection limit (LOD) of 0.13 μM in aqueous solution. For mercury ion (II), Ksv = 7.58 × 103 M−1 and LOD = 1.10 μM. For silver ion (I), Ksv = 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.

Two new Zn(II) coordination polymers (CPs), {[Zn(L)(5-nip)]2·5.5H2O}n (1) and {[Zn(L)(5-mip)]·EtOH}n (2) [L = 1,3-bis(benzimidazol-1-yl)-2-propanol, 5-H2nip = 5-nitroisophthalic acid, 5-H2mip = 5-methyisophthalic acid] were solvothermally synthesized and characterized by elemental analyses, IR spectra, thermogravimetric analyses, and single-crystal X-ray diffraction. CP 1 possesses a 1D ladder-like chain structure and further packed into 2D supramolecular architectures by π-π stacking interactions. CP 2 exhibits a 2D 63 layer, which is finally extended into 3D supramolecular network via the weak C–H⋯O hydrogen bond interactions. CP 1 and CP 2 can be used as luminescent sensors for Hg2+ and Cr2O72− ions in water.

Two coordination polymers (CPs), namely, {[Cd(L1)(1,4-ndc)]n (CP 1) and {[Cd(L2)1.5(BDC-Cl4)]·H2O}n (CP 2) (L1 = 1,4-bis(benzimidazol-1-yl)butane, L2 = 1,6-bis(benzimidazol-1-yl)hexane, 1,4-H2ndc = 1,4-naphthalenedicarboxylic acid, and H2BDC-Cl4 = 2,3,5,6-tetrachloroterephthalic acid) were synthesized and characterized by IR spectra, powder X-ray diffraction (PXRD), elemental analysis and single crystal X-ray diffraction analysis. CP 1 is a 4-connected Cd(II) CP with a 3D 2-fold interpenetrated cds framework. CP 2 is a 3D 5-connected architecture with sqc12 topology. The CPs 1 and 2 present excellent photocatalytic activities for degrading of methylene blue (MB) and methyl orange (MO) under UV light irradiation. Moreover, the photoluminescence properties and thermal stabilities of CP 1 and CP 2 are also discussed.

In this paper, the synthesis, characterization and dye adsorption properties of a new silver(I) coordination polymer (CP) [Ag2(L)(aip)]n (CP 1) (H2aip = 5-aminoisophthalic acid, L = 1,4-bis(5,6-dimethylbenzimidazol-1-yl)butane) were investigated. The one-dimensional chain CP 1 is constructed by the L and aip2− linkers. Congo red (CR) was used as model compound, the operational parameters include the effects of initial concentration of CR, solution pH, and temperatures were presented. The adsorption equilibrium data were best represented by the Langmuir isotherms, adsorption kinetics follows the pseudo-second-order models. In particular, maximum adsorption capacity of CP 1 towards CR reaches up to 297 mg/g at optimum conditions. Further, CP 1 showed highly selective and sensitive response to Fe3+ by luminescence quenching effects with a detection limit of 2.53 μM.

A new Co(II) organic framework, {[Co2(L)(hfpd)(H2O)]·1.75H2O}n (1) (H4hfpd = 4,4′-(hexafluoroisopropylidene)diphthalic acid, L = 4,4′-bis(imidazol-1-yl)-biphenyl) was hydrothermally synthesized and characterized. 1 possesses an unusual (4,6)-connected layered network architecture. Fluorescence titration results present that 1 is rarely dual-responsive probe to detect acetylacetone and Hg2+ ions by luminescence quenching.

Three Cd(II) coordination polymers (CPs), {[Cd(TCPA)(L)]·H 2 O} n ( 1 ), {[Cd(1,2-BDC)(L)]·H 2 O} n ( 2 ) and [Cd(1,3-BDC)(L) 0.5 (H 2 O)] n ( 3 ) (L = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)propane, H 2 TCPA = 2,3,5,6-tetrachloroterephthalic acid, 1,2-H 2 BDC = 1,2-benzenedicarboxylate and 1,3-H 2 BDC = 1,3-benzenedicarboxylate) were hydrothermally synthesized and characterized. 1 features a 2D {4 4 } structure, which constructs a 3D supramolecular structure through π - π stacking interactions. 2 shows a 1D ladder-like chain which is additional extended into a 3D supramolecular network via two different types of π-π stacking interactions. 3 retains a 2D (3,4)-connected 3,4L83 net which can be broadened into a 3D supramolecular structure by O–H···O hydrogen bonds. Both 1 , 2 and 3 could serve as efficient probes for detecting of Cr 2 O 7 2– anions with high quenching efficiency ( K sv) values (7820 M –1 for 1 , 9460 M –1 for 2 and 20018 M –1 for 3 , separately) and low detection limit (0.42 μM for 1 , 0.37 μM for 2 and 0.15 μM for 3 , respectively).

Two new Ag(I) coordination polymers (CPs), namely, Ag(L)(Htp) (1) and [Ag(L)]·(Htp)·2H2O (2) were synthesized from the long flexible ligand of 1,6-bis(2-methylbenzimidazolyl)hexane (L), terephthalic acid (H2tp) and different silver(I) salts using hydrothermal and sonochemical methods, These CPs were characterized by elemental analysis, IR spectra, scanning electron microscopy, single-crystal and powder X-ray diffraction analysis. 1 features a uninodal 3-connected 2D hcb layered structure, while 2 exhibits an infinite 1D linear chain and ultimately extended into 3D supramolecular framework via O–H⋯O and Ag⋯O interactions. In addition, the effect of various sonication concentrations of the initial reagents, ultrasonic time and power of ultrasound irradiation on the size and morphology of nanostructured 1 and 2 were evaluated. Nano-sized 1 and 2 exhibit relatively high performance as UV light driven photocatalysts for the degradation of methylene blue.

A metal-organic framework {[Cd2(L)(FA)(H2O)3]·H2O}n (1) was hydrothermal synthesized by utilizing a long flexible ligand 1,6-bis(benzimidazol-1-yl)hexane (L) and 4,4-(hexafluoroisopropylidene)diphthalic acid (H4FA). 1 possesses a unique (3,4,5)-connected 3D Cd(II)-organic framework with a point symbol of (42·62·72·84)(42·6)(64·82). Further, the luminescence explorations demonstrated that 1 exhibits sensitive sensing for Cr2O72− anion with high quenching efficiency Ksv value of 7.920 × 104 L·mol−1 and low detection limit (2.16 μM (S/N = 3)).

Hydrothermal reactions of the 1,5-bis(2-methylbenzimidazol-1-yl)pentane (L) and different polycarboxylates with cadmium(II)/zinc(II) acetate provided two new coordination polymers (CPs), namely, [Cd2(L)2(hfpd)]n (CP 1) and [Zn(L)(tbta)]n (CP 2) (H4hfpd = 4,4′-(hexafluoroisopropylidene)diphthalic acid, H2tbta = tetrabromoterephthalic acid). Both of the CPs were characterized by single crystal X-ray diffraction and elemental analysis, infrared spectroscopy, powder X-ray diffraction, and thermogravimetric analyses. CP 1 possesses a two-dimensional (2D) 3,4L13 network with point symbol of {4·62}2{42·62·82}. CP 2 is a 3D sqc182 framework with the point symbol {66}. The solid-state ultraviolet emission by two CPs was quenched by Fe3+ in aqueous solution with detection limit 0.31 μM and 0.85 μM (S/N = 3) for CP 1 and CP 2, respectively. Further, CP 1 and CP 2 show promising photocatalytic activities for degradation of the methylene blue (MB) in water.