Search

Two Cd(II) coordination polymers (CPs), namely {[Cd(L1)(mip)]·0.33H2O}n (1) and {[Cd(L2)(BDC-Cl4)]·1.35H2O}n (2) (H2mip = 5-methylisophthalic acid; L1 = 1,5-bis(benzimidazol-1-yl)pentane; H2BDC-Cl4 = tetrachloroterephthalic acid; L2 = 1,2-bis(2-methylbenzimidazol-1-yl)benzene) were synthesized and characterized. 1 features a 3D pcu network, 2 displays a 2D (4,4) layer. The photocatalytic activities of CPs 1 and 2 for degradation of methylene blue (MB) solution as well as the influence factors such as pH, concentration of dye and catalyst dosage were investigated under UV irradiation. The thermogravimetric analyses and luminescence properties of 1 and 2 were also carried out.

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)).

A new coordination polymer formulated as [Zn(L)(1,3-BDC)] (L = 1,3-bis-(benzimidazole-1-ylmethylene)-benzene, 1,3-H2BDC = isophthalic acid) is hydrothermally synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffraction analysis. It crystallizes in the monoclinic space group P21/n, a = 10.179(3) A, b = 10.510(3) A, c = 23.217(6) A, α = 90, β = 91.983(3), γ = 90°, V = 2482.4(11) A3, Z = 4, C30H22N4O4Zn, Mr = 567.91, Dc = 1.520 g/cm3, μ = 1.036 mm–1. The complex exhibits a 2D (4,4) network with the point symbol {44,62} and further extended into a 3D supramolecular framework through π⋯π stacking interactions between two well-overlapping benzimidazolyl rings of the neighboring L ligands. Furthermore, the thermal stability and fluorescence properties of the complex are investigated.

A fluorescent metal-organic framework (MOF), [Ag(btx)0.5(DCTP)0.5]n (1) (H2DCTP = 2,5-dichloroterephthalic acid and btx = 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene) has been hydrothermally synthesized and characterized by IR spectroscopy, elemental analysis, powder X-ray diffractions and thermogravimetry. The framework of 1 can be classified as a binodal (4,4)-connected PtS topological network. The fluorescence explorations demonstrated that 1 shows selective and sensitive detection towards Cr2O72− with high quenching efficiency of 1.92 × 104 M−1. The rapid and efficient response of 1 to Cr2O72− ion suggests that this material could be used as a luminescent sensor for Cr2O72− ion. Meanwhile the photocatalytic properties of 1 for the degradation of RhB have also been investigated under UV radiation. The possible photocatalytic mechanisms were also speculated. Hence, 1 can become multi-functional material in sensitive detection and effective removal of some environment pollutants in industrial waste water solutions.

A silver(I) coordination polymer (CP), {[Ag(DCTP)0.5(bpy)(H2O)]·0.5H2O}n (1) based on 2,5-dichloroterephthalic acid (H2DCTP) and 4,4′-bipyridine (bpy) were synthesized under hydrothermal condition. CP 1 features a 1D infinite undulating ladder-like chain, which is further extended into a 3D supramolecular network through classic O–H⋯O hydrogen bond interactions. CP 1 exhibits highly selective and sensitive luminescent detection for Cr2O72− in aqueous solution with quenching efficiency up to 2.00 × 104 M−1 and a low detection limit of 2.06 µM. Further, Hirshfeld surface analyses and the photocatalytic properties of CP 1 have also been investigated in detail. Remarkably, CP 1 presented a rare example of Ag(I)-based CP as luminescent probe and photocatalytic materials simultaneously.

A new coordination polymer (CP), formulated as [Cd(L)(DCTP)]n (1) (L=1,1'-(1,4-butanediyl)bis(2-methylbenzimidazole), H2DCTP=2,5-dichloroterephthalic acid), was synthesized under hydrothermal conditions and the performance as luminescent probe was also investigated. Single-crystal X-ray diffraction reveals CP 1 is a 3D 3-fold interpenetrated dia network with large well-defined pores. It is found that CP 1 revealed highly sensitive luminescence sensing for Fe3+ ions in acetonitrile solution with a high quenching efficiency of KSV=2541.238L·mol-1 and a low detection limit of 3.2μM (S/N=3). Moreover, the photocatalytic efficiency of 1 for degradation of methylene blue could reach 82.8% after 135min. Therefore, this coordination polymer could be viewed as multifunctional material for selectively sensing Fe3+ ions and effectively degrading dyes.

Two ternary cobalt(II) coordination polymers (CPs), namely [Co(L1)(npht)] n (1) and {[Co2(L2)2(npht)2(H2O)]·H2O} n (2) (L1 = 4,4′-bis(benzimidazol-1-ylmethyl)biphenyl, L2 = 1,2-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, and H2npht = 4-nitrophthalic acid) have been synthesized and structurally characterized by X-ray crystallography. Both CPs feature similar 1D infinite chains containing two distinct loops. CP 1 further forms a 3D supramolecular network via weak C–H···O hydrogen bond interactions. CP 2 shows a 1D two-layer chain structure, assembled through π–π stacking interactions. The electrochemical, luminescence, and photocatalytic activities of the two CPs for the removal of methylene blue under visible or UV light were investigated. Possible photocatalytic mechanisms are discussed.

Based on 1,3-bis(2-methylbenzimidazole)propane (L1), 1,4-bis(2-methylbenzimidazole)butane (L2) and 1,4-bis(2-methylbenzimidazol-1-ylmethyl)benzene (L3) with aromatic carboxylic acids, three cocrystals, [(H2L1)2+·2(H2btrc)1−] (1), [(H2L2)2+·(H2btec)2−·2H2O] (2) and [(H2L3)2+·(H2btec)2−] (3) (H3btrc = 1,2,4-benzenetricarboxylic acid, H4btec = 1,2,4,5-benzenetetracarboxylic acid) were synthesized in solution and obtained by slow evaporation. All solid products were characterized by elemental analyses, IR spectra, and single-crystal X-ray diffraction. Components of the crystalline phase have also been investigated in terms of Hirshfeld surfaces. The bis(benzimidazole) derivatives interlinked with aromatic carboxylates through intermolecular H-bonding and π–π interactions generate diverse 3D supramolecular networks for 1, 2, and 3. The Hirshfeld surfaces and 2D fingerprint plots of three cocrystals show that 1–3 are stabilized by N–H···O, O–H···O, and π–π intermolecular interactions. The thermal stabilities and photoluminescence properties for cocrystals 1–3 were presented in the solid state.

Two Co(II) coordination polymers (CPs), namely [Co(L)(tp)] n (1) and [Co(L)0.5(tbip)·H2O] n (2), (L = 1,6-bis(2-methylbenzimidazolyl) hexane, H2tp = terephthalic acid, H2tbip = 5-tert-butyl isophthalic acid), were hydrothermally synthesized and characterized by physicochemical and spectroscopic methods. CP 1 possesses a 2D (4,4) corrugated layer structure, which further extends into a 3D supramolecular framework by π–π stacking interactions, while CP 2 has a 1D ladder-like chain structure and combines into a 2D layer via O–H⋯O hydrogen-bonding interactions. The thermal stabilities, luminescence and electrochemical properties of both CPs, as well as photocatalytic activities for the decomposition of methylene blue, were presented. The photocatalytic mechanism was investigated by introducing t-butyl alcohol, EDTA-2Na and benzoquinone as ⋅OH, (hole)+ and ·O2− scavengers, respectively.

Two ternary mixed Mn(II) coordination polymers (CPs), namely [Mn(L1)(Hnip)2] n (1) and [Mn(H0.5L2)2(H1.5btc)2] n (2) (H2nip = 5-nitroisophthalic acid, L1 = 1, 4-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, H3btc = 1,3,5-benzenetricarboxylic acid, L2 = 4,4′-bis(benzimidazol-1-ylmethyl)biphenyl), have been synthesized under hydrothermal conditions and structurally characterized. CP 1 exhibits a non-interpenetrated six-connected pcu framework with the point symbol {412·63}, while CP 2 features a metal-carboxylate loop-like chain, which is further assembled into a 3D supramolecular network via hydrogen bonds and π–π interactions. The thermal stabilities, luminescence, and catalytic properties of both CPs for the degradation of methyl orange in a Fenton-like reaction have also been investigated.

Two coordination polymers (CPs), [Zn(L1)(H2bta)] (1) and [Co(L2)(ndc)]·0.75H2O (2), (L1 = 1,6-(thiabendazole)hexane), L2 = 1,3-(thiabendazole)propane, H4bta = 1,2,4,5-benzenetetracarboxylic acid, H2ndc = 2,6-naphthalenedicarboxylic acid) have been hydrothermally synthesized and characterized. Single crystal X-ray diffraction analyses reveal that CP 1 and CP 2 feature 1D infinite zigzag and “Ω”-like chains, and further extend into 3D supramolecular framework by O–H⋯O and C–H⋯O hydrogen bonding interactions, respectively. Furthermore, the luminescence properties, thermal stability, and catalytic degradation of methyl orange in a Fenton-like process are also investigated in detail.

Three zinc(II) coordination polymers (CPs), {[Zn(L)0.5(tbta)]·0.5 L·2.5H2O}n (1), {[Zn(L)0.5(mip)]·H2O}n (2) and {[Zn(L)0.5(npht)(H2O)]·0.5H2O}n (3) (L = 1,4-bis(thiabendazole)butane, H2tbta = tetrabromoterephthalic acid, H2mip = 5-methylisophthalic acid, H2npht = 3-nitrophthalic acid) have been hydrothermally synthesized and structurally characterized. Single-crystal X-ray diffraction analyses reveal that CP 1 shows a 2D honeycomb-like (6, 3) network. CP 2 displays a hybrid helical chain, and further assembled into a 2D supramolecular layer via weak C H⋯O hydrogen bonding interactions, whereas CP 3 is a right-handed helical chain and finally extended into a 3D supramolecular structure by classical O H⋯O hydrogen bonds and π–π stacking interactions. Further, the Hirshfeld surfaces, fingerprint plots, fluorescence properties and catalytic performances of three CPs for the degradation of methyl orange dye in a Fenton-like process have been investigated.

Two ternary mixed-ligand coordination polymers (CPs), namely [Ni(L)2(DCTP)] n (1) and [Co(L)(DCTP)] n (2), have been hydrothermally synthesized by reacting different transition metal salts with 2,5-dichloroterephthalic acid (H2DCTP) and 4,4′-[bis(imidazol-1-ylmethylene)]biphenyl (L) as ligands. Both CPs 1 and 2 were characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction; CP 1 exhibits a non-interpenetrated six-connected α-Po (or pcu net) framework structure, with the point symbol {412·63}. CP 2 shows a fivefold-interpenetrating four-connected sqc6 topology with the point symbol {66}. The thermal stabilities, luminescence and catalytic properties of both CPs for the degradation of methyl orange in a Fenton-like process have been investigated.

A ternary mixed ligand Co(II) coordination polymer, namely, {[Co(L)(btec)0.5(H2O)]·3H2O} n , (L = 1,4-bis(thiabendazole)butane, H4btec = 1,2,4,5-benzenetetracarboxylic acid) has been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction analysis. The coordination polymer features a 1D wave-like chain, which is further extended into a 3D supramolecular framework via O–H⋯O hydrogen bonding interactions. It is noteworthy, the chair-shaped homododecamers and quasirectangle teteramers assemble with the 1D loose-string-like water-btec4− chain into a unusual boxing-glove-like 2D water layer. Hirshfeld surface analysis and fingerprint plots show that the coordination polymer is stabilized by O–H⋯O, π⋯π, O–H⋯π, and H⋯H intermolecular interactions. Furthermore, thermal behaviors, luminescence and catalytic properties of the coordination polymer for degradation of methyl orange in a Fenton-like process have been investigated.

Four Cd(II) coordination polymers (CPs) including [Cd(btbb)0.5(L1)] n (1), [Cd(btbb)(L2)·(H2O)1.5] n (2), [Cd(btbb)(L3)] n (3), and [Cd(btbb)(HL4)] n (4) (btbb = 1,4-bis(thiabendazole)butane, H2L1 = 5-hydroxyisophthalic acid, H2L2 = 4,4′-biphenyldicarboxylic acid, H2L3 = tetrabromoterephthalic acid, H3L4 = 5-nitro-1,2,3-benzenetricarboxylic acid) were prepared under hydrothermal conditions based on flexible bis(thiabendazole) ligand and different co-carboxylates. Their structures have been determined by single-crystal X-ray diffraction analyses, elemental analyses, IR spectra, X-ray powder diffraction, and thermogravimetric analyses. CP 1 exhibits a 3D 2-nodal (3,4)-connected framework with the 3,4T10 topology. CP 2 and 3 feature typical hcb layer structure, and 3 is further combined into a 3D supramolecular architecture through C–H⋯O hydrogen bonds. CP 4 possesses an infinite chain and further extended into 2D supramolecular network by O–H⋯O hydrogen-bonding interactions. The effects of the aromatic polycarboxylate co-ligands on the CPs framework have been discussed and the catalytic activities of CPs 1–4 for degradation of methyl orange in Fenton-like process are also investigated.

Two coordination polymers (CPs), namely [Ni(L)(chdc)] n (1) and [Mn(L)(ndc)(H2O)] n (2) (L = 4,4′-bis(imidazol-1-ylmethyl)biphenyl, H2chdc = 1,2-cyclohexanedicarboxylic acid, H2ndc = 2,6-naphthalenedicarboxylic acid), have been hydrothermally synthesized and characterized by physicochemical and spectroscopic methods and also by single-crystal diffraction. Both CPs feature 3D-diamond-like networks with point symbol of 66; CP-1 displays a 2-fold interpenetrated net, while CP-2 presents a non-interpenetrated framework. The thermal stabilities, solid-state luminescence properties and catalytic activities of both CPs for degradation of methyl orange in a Fenton-like process were investigated.

Three d 10 coordination polymers formulated as [Zn(L1)2(mip)] n (1), [Zn(L1)(2,6-ndc)] n (2) and [Cd(L2)0.5(bpdc)] n (3) (L1 = 1,1′-(1,3-propanediyl)bis(thiabendazole), L2 = 1,1′-(1,6-hexanediyl)bis(thiabendazole), H2mip = 5-methylisophthalic acid, 2,6-H2ndc = 2,6-naphthalenedicarboxylic acid, H2bpdc = 4,4′-biphenyldicarboxylic acid) were hydrothermally synthesized. Complexes 1–3 were characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction analysis, and single crystal X-ray diffraction. Complexes 1 and 2 present different chain structures, both of them are extended into 2D supramolecular architectures via C–H···O hydrogen bonds, while 3 is a three-fold interpenetrating three-dimensional framework with binodal 4,4-connected mog topology. The thermal stability, UV–visible spectroscopy and luminescence properties of complexes 1–3 were also examined. Furthermore, complex 3 exhibits relatively positive catalytic activity towards the degradation of methyl orange in a Fenton-like process.

Two Ni(II) coordination polymers, namely {[Ni(L1)(2,6-ndc)0.5(H2O)2]·0.5(2,6-ndc)·2H2O} n (1) and [Ni(L2)(1,4-ndc)(H2O)] n (2) (L1 = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol, L2 = 1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, 2,6-H2ndc = 2,6-naphthalenedicarboxylic acid and 1,4-H2ndc = 1,4-naphthalenedicarboxylic acid) have been synthesized under hydrothermal conditions and structurally characterized by elemental analyses, thermogravimetric analysis, IR spectra, and single crystal X-ray diffraction. CP-1 presents a 1D zigzag chain, and CP-2 features a 1D tube-like chain. Both one-dimensional coordination polymers are further extended into 3D and 2D supramolecular framework via classical O–H···O hydrogen bondings, respectively. Moreover, the catalytic properties of the two complexes for the degradation of Methyl orange in a Fenton-like reaction are discussed.

Three coordination polymers, [Co(L)(tbta)]n (1), [Ag(L)(H2O)·(Hhpht)]n (2) and [Ag2(L)1.5(oba)]n (3) (L = 1,4-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H2tbta = tetrabromoterephthalic acid, H2hpht = homophthalic acid, H2oba = 4,4′-oxybis(benzoic acid)), have been hydrothermally synthesized and structurally characterized. Complex 1 displays a 2-D uninodal 4-connected sql network, 2 and 3 feature chain structures, which further generate 2D supramolecular networks through hydrogen bonding interactions. The thermal and fluorescence properties of 1–3 have been carried out and discussed.

Three silver(I) coordination polymers namely, [Ag4(L1)2(1, 4-ndc)2]n (1) {[Ag(L2)]·(1, 4-Hndc)·H2O}n (2), and {[Ag(L3)(H2O)]·(1, 4-Hndc)}n (3) [L1 = 1, 3-bis(benzimidazol-1-ylmethyl)benzene, 1, 4-H2ndc = 1, 4-naphthalenedicarboxylic acid, L2 = 1, 3-bis(5, 6-dimethylbenzimidazole-1-ylmethyl)benzene, L3 = 1, 4-bis(5, 6-dimethylbenzimidazole)butane], were hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analysis, IR spectroscopy, thermogravimetric and XRPD analysis. Complex 1 displays a 1D tube-like chain, which is packed into a 3D supramolecular network by π–π stacking interactions. Complex 2 features an infinite 1D linear chain. Complex 3 contains a 1D wave-like chain, which is extended into a 3D supramolecular network through O–H···O hydrogen bonding interactions. Moreover, these coordination polymers exhibit catalytic properties for degradation of methyl orange in Fenton-like processes.

Three coordination polymers, namely {[Ni(L1)(nip)(H2O)]·2H2O} n (1), [Co(L2)(tbip)] n (2), and {[Co2(L3)2(bptc)]·3H2O} n (3) (L1 = 1,4-bis(5,6-dimethylbenzimidazole)butane, L2 = 1,4-bis(5,6-dimethylbenzimidazole)-2-butylene, L3 = 1,3-bis(5,6-dimethylbenzimidazole)propane, H2nip = 5-nitro-isophthalic acid, H2tbip = 5-tert-butyl-isophthalic acid, H4bptc = biphenyl-3,3′,4,4′-tetracarboxylic acid), have been synthesized under hydrothermal conditions and characterized by physicochemical and spectroscopic methods as well as by single-crystal X-ray diffraction analysis. Complexes 1 and 2 both feature a two-dimensional (4,4) layer with (44 × 62) topology. Complex 3 possesses a uninodal 4-connected 2D htb network. The fluorescence spectra and catalytic properties of the complexes for the degradation of methyl orange by sodium persulfate in a Fenton-like process are reported.

Three Ag(I) coordination polymers [Ag(L1)]·(H3bptc)·H2O (1), [Ag2(L2)(oba)]·H2O (2), and [Ag2(L2)2]·(H2bptc) (3) [L1 = 1,4-bis(3,5-dimethylpyrazole)butane, L2 = 1,4-bis(2-methylbenzimidazole)butane, H4bptc = 3,3′,4,4′-biphenyltetracarboxylic acid, H2oba = 4,4′-oxybis(benzoic acid)] constructed from N-containing ligands with different flexibilities and organic carboxylates as co-ligands have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis. All three complexes display 1D chain structures, which are further extended into 2D supramolecular networks via non-classical C–H···O hydrogen bonding interactions. The fluorescence and catalytic properties of the complexes 1–3 have been investigated in detail. Complexes 2 and 3 reveal promising catalytic activities for the degradation of methyl orange in a Fenton-like process.

Two Zn(II) coordination polymers, formulated as {[Zn(L1)0.5(btc)0.5(H2O)]·H2O} n (1) and {[Zn(L2)(1,4-ndc)]·2H2O} n (2) [L1 = 1,4-bis(2-methylbenzimidazole-1-ylmethyl)benzene, L2 = 1,4-bis(2-methylbenzimidazole)butane, H4btc = butane-1,2,3,4-tetracarboxylic acid, 1,4-H2ndc = 1,4-naphthalenedicarboxylic acid] have been synthesized and structurally characterized by single crystal X-ray diffraction. Complex 1 features a 3D (3,4)-connected network with the topology of fsh-3,4-P21/c. Complex 2 is a 2D (4,4) grid with sql topology and further extends into a 3D supramolecular framework by π–π stacking interactions. In addition, the thermal stability, fluorescence, and catalytic properties of two complexes for degrading methyl orange dye in a Fenton-like process were investigated.

Two coordination polymers, namely [Ni(L1)-(ndc)(H2O)] n (1) and [Cu(L2)0.5(ndc)] n (2) (L1 = 1,3-bis(2-methylbenzimidazol-1-ylmethyl)benzene, L2 = 1,4-bis(2-methylbenzimidazole)butane, H2ndc = 2,6-naphthalenedicarboxylic acid) have been synthesized and characterized by single-crystal and powder X-ray diffraction, IR spectroscopy, thermogravimetric analysis, and elemental analysis. Complex 1 features a 2D 3-connected hcb network with 63 topology, which is further extended into a 3D supramolecular framework by O–H···O hydrogen bonding interactions. Complex 2 possesses a 3D threefold interpenetrating (4,5)-connected xah topological network, and its Schlafli symbol is (42.62.82)(46.64). Both complexes exhibit intense luminescence emissions in the solid state and promising catalytic activities for the degradation of Congo red azo dye in a Fenton-like process.

Three new ternary nickel(II) coordination polymers, namely, {[Ni2(L)2(1,4-NDC)2(H2O)]·8.5H2O}n (1), {[Ni(L)(TBTA)(H2O)2]·H2O}n (2) [Ni(L)(OBA)(H2O)]n (3) (L = 1,4-bis(5,6-dimethylbenzimidazol-1-yl)-2-butylene; 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid; H2TBTA = tetrabromoterephthalate; H2OBA = 4,4′-oxybis(benzoic acid)), were solvothermally synthesized and characterized. 1 exhibits an unusual 3D 3,6T13 framework. 2 and 3 both display the 2D sql networks. 1–3 have highly photocatalytic efficiency for the degradation of methylene blue by UV light irradiation. The photocatalytic mechanism was proposed, which was confirmed by trapping experiments in the presence of radical scavengers.

Two new complexes with composition {[Ni(L1)(mip)(H2O)]·3.6H2O}n (1) and {[Co(L2)2(npht)]·H2O}n (2) [H2mip = 5-methylphthalic acid, H2npht = 5-nitrophthalic acid, L1 = 1,3-bis(thiabendazol-1-ylmethyl)benzene, L2 = 1,4-bis(thiabendazol-1-ylmethyl)benzene)] were hydrothermally synthesized and characterized by physicochemical and spectroscopic methods. 1 displays a binuclear [Ni2L12(mip)2] structure and further extends into a 2D layer via O–H⋯O hydrogen bond interactions, 2 holds a 1D zigzag linear chain which is further packed via C–H⋯O hydrogen bond interactions into a 3D supramolecular network. Sensing experiments indicate that both complexes can be as high selectivity and sensitivity fluorescent chemosensors for ethylene glycol and Fe3+/Cu2+.

Three coordination polymers (CPs), namely, {[Zn(L1)(muoc)]·H2O}n (1), {[Zn(L2)(muoc)]2}n (2) and {[Zn(L2)(SA)]2}n (3), where L1 = L = 1,3-bis(benzimidazol-1-yl)-2-propanol, L2 = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol, H2muoc = trans,trans-muconic acid and H2SA = succinic acid, have been hydrothermally synthesized and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analyses. 1 is 2D (6,3) network. 2 possesses a 2D (4,4) network, and the 2D layers are further packed into the 3D supramolecular framework by O–H⋯O hydrogen bonding interactions. 3 forms a 1D cyclic chain and further extend into 3D supramolecular framework by O–H⋯O hydrogen bonding and the aromatic stacking interactions. The photocatalytic properties of three CPs for degradation of methylene blue (MB) upon UV light irradiation were further investigated.

Nano-structures of [Zn(L)(atpt)]n (1) (L=1,2-bis(2-methylbenzimidazol-1-ylmethyl)benzene and H2atpt=2-aminoterephthalic acid) were obtained by hydrothermal and sonochemical approaches, characterized by scanning electron microscopy (SEM), IR, powder X-ray diffraction (PXRD), and elemental analysis. CP 1 features a 2D (4,4) network with the point symbol {44.62}, the 3D supramolecular architecture in CP 1 is controlled through π⋯π stacking interactions. The influence of various concentrations of initial reagents, power of ultrasound irradiation, and ultrasound time on the morphology and size of nano-structured CP 1 were studied in detail. In addition, the luminescence and photocatalytic properties of the nanoparticles of CP 1 for the degradation of methyl blue (MB) have also been investigated.

A nanoparticle of cobalt(II) coordination polymer (CP), [Co(L)(npht)] n ( 1 ) (H 2 npht = 4-nitrophthalic acid, L = 1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene) and its nanocomposite (Ag/CP 1 ) were obtained by the sonochemical approach and characterized by IR, elemental analysis, thermogravimetric analyses (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRPD). CP 1 shows a 1D double chain containing two different helical chains, which is further extended into a two-dimensional supramolecular framework by C–H⋯O hydrogen bonding interactions. The photoluminescence properties and photocatalytic properties of the nanoparticles of CP 1 and Ag/CP 1 on the degradation of methylene blue (MB) were investigated, Ag/CP 1 exhibited excellent photocatalytic activity under UV and visible light, which can be attributed to the strong interactions between Ag nanorods and CP 1 , which lead to electron–hole pair separation between Ag nanorods and CP 1 . In addition, the photocatalytic mechanism is also carried out by introducing t -butyl alcohol (TBA) as a widely used ·OH scavenger. The influence of ultrasound irradiation time and power on the morphology and size of the nanostructure CP 1 were studied. The results indicated that a decrease in time and an increase in power led to a decrease of particle size.

Nanoparticles of two silver(I) coordination polymers (CPs), [Ag2(L1)2(DCTP)]n (1) and [Ag2(L2)(DCTP)]n (2) (L1=1,3-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, L2=1,4-bis(benzimidazol-1-yl)-2-butene, H2DCTP=2,5-dichloroterephthalic acid), were synthesized by the sonochemical approach and hydrothermal method. Both CPs were characterized by elemental analysis, IR spectra, single-crystal X-ray diffraction, scanning electron microscopy (SEM), and thermogravimetric analyses (TGA). CP 1 exhibits a 2D 4-connected sql net with the point symbol {44.62}. While CP 2 displays a 2D 3,4-connected 3,4L13 net with the point symbol {4.62}2{42.62.82}. The structural diversity indicates that semi-rigid bis(benzimidazole) co-ligands play important roles in tuning the structures of the mixed Ag(I) CPs. The ultrasound irradiation time, temperature, and power showed significant effects on the morphology and growth process of the nanoparticles of two silver(I) CPs. The luminescence and photocatalytic properties of the nanoparticles of CPs 1-2 on the degradation of methyl blue (MB) were also investigated in detail.

A planar, impedancemetric NO2 sensor with 8% yttria stabilized zirconia (YSZ) as electrolyte and NiO nanoparticles as sensing electrode and a Pt counter electrode was fabricated and tested. The nano-structured NiO sensing electrode was fabricated by infiltrating aqueous solutions of nickel nitrate into porous layer in a bilayer yttria-stabilized zirconia (YSZ) pellet, followed by calcination at 800 °C for 3 h. The complex impedance of the device was measured in the frequency range of 0.1–100 kHz and in the temperature range of 500–600 °C, respectively. The resistance value (Z′) of the device at low frequency varied with concentration of NO2 in sample gases. The response signal (|Z|base−|Z|gas) at 0.1 Hz of the present device was found to vary almost linearly with the logarithm of NO2 concentration from 20 to 300 ppm at fixed oxygen concentrations at 500–600 °C. The present sensor has many advantages, such as, simple structure, easy preparation, fast response and high sensitivity.

The microstructure of talcum powder added with the KH550、KH560 and silane composite coupling agent were studied by atomic force microscope, the modified effect of KH560 coupling agent was the best, which verified through the microstructure analysis and the wetting contact Angle proved law method. The relationship between the dosage of KH560 coupling agent and contact angle was analyzed by the wetting contact Angle proved law method. The optimum dosage of KH560 coupling agent was determined by the experimental results of the viscosity of polishing putty.

The perovskite nanoparticle materials La0.75Sr0.25Mn0.5Co0.5O3-δ were prepared in YSZ porous layer by infiltration technology. An impedancemetric-type NO2 sensor was prepared with the nanoparticle materials as sensing electrode and YSZ as solid state electrolyte. The crystalline phase and microstructure of sensing electrode in the NO2 sensor were investigated by XRD and SEM. The result of XRD indicated that perovskite LSCM was obtained in porous YSZ after infiltrating precursor solution and heat-treatment. SEM analysis demonstrated that the grain size of LSCM was 50−100 nm, and the LSCM nanoparticles were closely incorporated with YSZ frames in porous layer. The sensing characteristics of the present device were also investigated at 450−600°C. The results suggested that the sensor showed preferential sensitivity to NO2 with NO2 concentration from 0 to 1000μL/L. When frequency was fixed at 0.1 Hz, the total impedance of the sensor changed almost linearly with NO2 concentration. The real response time of the sensor to NO2 gas was around 40s at gas flow rate of 400mL/min. It is also found that the response of sensor is stable at given time and the sensor has good anti-interference to O2 and CO2.