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Tricarboxylic acid 3,5-bis(-carboxy-phenoxy) benzoic acid (H3BCPBA) 1,5-bis(imidazol-l-yl)-benzene(bib) ligands and cadmium nitrate were used to synthesize two new metal–organic frameworks with different structure under the hydrothermal and solvent thermal conditions, namely [Cd(HBCPBA)(bip)]n (1) and [Cd2(HBCPBA)2(bip)0.5]n (2). We determined the structure of two metal-organic frameworks by XRD, and characterized their structures by TG and powder X-ray diffraction (PXRD). Also we tested the fluorescence properties of the two coordination polymers at room temperature. The results showed the Complex 1 crystallizes in the Hexagonal space group P65, with tentacle structure. Complex 2 crystallizes in the Monoclinic space group P21/c, with a layer of three interdigitated structure. Fluorescence test results show that these two complexes can be used as fluorescent probes to selectively detect and identify Fe3+ ions in water.

Four novel coordination polymers (CPs), namely, [ZnL(bimb)]·DMF (1), [ZnL(bimb)]·6(H2O)0.5 (2), [ZnL(bimp)0.5]·3H2O (3) and [ZnL(bimp)]·7H2O (4), (H2L = 4,4′-(phenylazanediyl)dibenzoic acid, bimb = 1,4-bis(imidazol-1-yl)benzene, bimp = 3,5-bis(1-imidazoly)pyridine), have been synthesized under hydrothermal conditions with different solvents and decreased temperature rates. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by infrared spectra (IR), elemental analyses, and thermogravimetric analyses (TGA). 1 exhibits an infinite 4-fold interpenetrated three-dimensional (3D) framework with (66) topology. 2 displays the 2D undulated sheets leading to form a 3D framework with π-π interactions among layers in ABAB fashion. 3 exhibits an infinite 2-fold interpenetrated 3D framework with (412·63) topology. 4 exhibited 2D layer with {42·63·8} topology structure. Photoluminescence properties of 1–4 in solid state at ambient temperature were studied, too.

Six novel coordination polymers, namely, [Cu1.5(H2L)0.5(H4L)0.5(bibp)1.5]·3H2O (1), [Zn1.5L0.5(bib)(H2O)]·4H2O (2), [Zn1.5L0.5(bib)1.5]·DMF (3), [Co0.5(H4L)0.5(bibpip)(H2O)]·3H2O (4), [Zn(H2L)0.5(tip)] (5), [Cu(H4L)0.5(H6L)0.5(tip)(H2O)]·2H2O (6), [H6L = p-terphenyl-2,2″,2′′′,5,4″,4′′′-hexcarboxylic acid, bibpip = 1,4-bis(4-(1H-imidazol-l-yl)benzyl)piperazine, bib = 1,4-bis(imidazolyl)butane], tib = 1,3,5-tris(1-imidazolyl)benzene, bibp = 4,4′-bis(imidazol-1-yl)biphenyl, have been synthesized under solvothermal and hydrothermal conditions. Their structures have been characterized by single-crystal X-ray diffraction analysis, elemental analysis, Infrared spectroscopy and thermogravimetric analysis. Compound 1 exhibits an infinite 3D structure with (52·62·7·8)(53·6·72) topology. Compound 2 features an unusual structure exhibiting (3,4,6)-connected 3D framework with (52·64)(52·6)2(54·66·72·8·92) topology. Compound 3 shows (4,6)-connected 3D framework with (52·6·7·82)2(55·7)(56·62·74·83) topology. Compound 4 views of 2D sheets. Compound 5 exhibits an unusual two-fold interpenetrating 3D framework with (64·82)(66)2 topology. Compound 6 shows (3,4)-connected binodal 2D net with the (42·6)(42·63·8) topology. Their photochemical properties were measured.