A novel compound, {[Y（HPIDC）（OX）1/2（H2O）]·2H2O}n （1, H3PIDC = 2-（pyridin-4- yl）-1H-imidazole-4,5-dicarboxylic acid, H2OX = oxalic acid）, has been synthesized under hydrothermal conditions and characterized by thermal analysis （TGA）, powder X-ray diffraction （PXRD）, and single-crystal X-ray diffraction. Complex 1 crystallizes in monoclinic space group P21/c with a = 8.342（8）, b = 14.61（1）, c = 11.487（1）, β = 90.78（9）°, V = 1400.4（2）3, Z = 4, C11H11N3O9Y, Mr = 418.14, Dc = 1.983 g/cm3, F（000） = 836, Rint = 0.0509, T = 293（2） K, μ = 4.240 mm-1, the final R = 0.0477 and wR = 0.1125 for 2770 observed reflections with I 2σ（I）. Compound 1 exhibits a 3D framework and generates the 1D open channels filled with free water molecules. The structure of 1 can be rationalized as a diamondoid network when the atom yttrium is regarded as a 4-connected node linking four surrounding yttrium atoms. The luminescent property of compound 1 is also investigated.
A new luminescent Cd（Ⅱ） coordination polymer, [Cd（L）2（H2O）]n 1 （HL = xan-thene-9-carboxylic acid）, was synthesized hydrothermally and characterized by satisfactory elemental analysis, FT-IR spectra and single-crystal X-ray diffraction. The crystal is of orthorhombic system, space group P212121 with a = 6.4548（4）, b = 13.0876（12）, c = 27.466（2）, V = 2320.3（3）3, C28H20CdO7, Mr = 580.84, Z = 4, Dc = 1.663 g/cm3, F（000） = 1168, μ = 0.990 mm-1, Flack parameter = 0.00（2）, the final R = 0.0296 and wR = 0.0691 for 5301 observed reflections （I 2σ（I））. 1 features a one-dimensional （1D） carboxylate oxygen-bridged inorganic chain, which is further connected by intermolecular hydrogen bonds into a three-dimensional （3D） framework. Moreover, compound 1 exhibits strong photoluminescence in the solid state at room temperature.
The solvothermal reaction of CuI with 5-amino-2-benzimidazolethiol in acetonitrile condition affords complex [Cuz（5-amino-2-benzimidazolethiol）2]2 which has been characterized by elemental analysis, infrared spectrum and single-crystal X-ray diffraction analysis. Crystal data for C28H24N12S4Cu4： monoclinic, space group C2/c with a = 15.970（5）, b = 12.365（4）, c = 16.293（5） A, fl = 91.977（6）°, V = 3215.5（18）, Z = 4, Mr= 910.99, Dc= 1.882 g/cm3 , F（000） = 1824, p = 2.913 mm-1, λ（MoKa） = 0.71073A, T= 293（2） K, the final R = 0.0527 and wR = 0.1342. X-ray diffraction analysis revealed that the title complex exhibits a l D channel constructed from tetranuclear-copper（I） motifs connected by hydrogen bonds and shows strong photoluminescence in the solid state at room temperature.
The title complex, [Cd（MeHbibzim）（1,4-bdc）]n （1, MelToibzim = 1-methyl-2,2＇- bibenzimidazole, 1,4-bdc = terephthalate）, was synthesized with hydrothermal reactions. The compound crystallizes in monoclinic, space group C2/c with a = 9.822（4）, b = 18.510（7）, c = 22.372（9） A, β = 98.359（6）°, C23H16CdN4O4, Mr = 524.81, V= 4024（3） A3, Z = 8, Dc. = 1.733 g/cm3, μ（MoKa） = 1.126 mm-1, F（000） = 2096, the final R = 0.0597 and wR = 0.1374 for 3906 observed reflections （1 〉 2σ（I））. X-ray diffraction analysis reveals that the Cd atom is coordinated by two nitrogen atoms from the chelating MeHbibzim and three carboxyl oxygen atoms from three terephthalate ligands, thus forming a distorted square pyramidal coordination sphere, [CdN2O3]. Every two Cd atoms are linked together via two carboxyl groups into a dinuclear unit with Cd...Cd separation of 3.806（4） A. The dinuclear building units are linked by terephthalate ligands into two-dimensional layers, which are further aggregated into a 3D framework via hydrogen bonding interactions.
