A new complex, [Cd（Himc）2（H2O）2] 1, obtained from imidazole-4-carboxylatic acid （H2imc） and Cd（ClO4）2·6H2O, has been synthesized. The crystal structure was determined by X-ray diffraction. The title compound crystallizes in the orthorhombic system, space group Pccn, with a = 7.4886（11）, b = 11.9667（18）, c = 13.550（2） A, V= 1214.3（3） A3, Z = 4, Mr= 370.60, Dc = 2.027 mg/m3, F（000） = 728,μ （MoKa） = 1.829 mm^-1, the final R = 0.0243 and wR = 0.0591 for 1150 unique reflections with I 〉 2σ（I）. The cadmium（II） center in the title complex is coordinated with two oxygen and two nitrogen atoms from two bidentate chelated imidazole-4-carboxlate ligands together with two water molecules, giving a distorted octahedral coordination geometry. A one-dimensional hydrogen bonding chain is formed via intermolecular O-H...O hydrogen bonds, and such adjacent chains are further stacked through intermolecular π-π and hydrogen bonding interactions to form a 3D supramolecular framework. Complex 1 exhibits a fluorescent emission band at 290 nm （λex = 236 nm） in the solid state.
Two new transition metal complexes, [Ni（bipy）2Cl]·ClO4 （bipy = 2,2＇-bipyridine） 1 and [Zn（bipy）2Cl]·BF4 2, have been synthesized and characterized by single-crystal X-ray diffraction analysis. Both 1 and 2 crystallize in monoclinic space group P21/n with Z = 4. For 1, a = 10.776（1）, b = 12.067（1）, c = 16.146（2）A, β = 93.021（2）o, V = 2031.9（4） A^3, Mr = 505.98, Dc = 1.654 g/cm^3, μ = 1.255 mm^–1, F（000） = 1032, the final R = 0.0406 and wR = 0.1002 for 3983 observed reflections with Ⅰ 〉 2σ（Ⅰ）. For 2, a = 10.758（4）, b = 12.058（4）, c = 16.135（5） A, β = 104.57（1）o, V = 2025.7（12） A^3, Mr = 500.00, Dc = 1.639 g/cm^3, μ = 1.396 mm^–1, F（000） = 1008, the final R = 0.0470 and wR = 0.1237 for 3759 observed reflections with Ⅰ 〉 2σ（Ⅰ）. The crystal structures of 1 and 2 are isostructural with very similar supramolecular structures. A one-dimen-sional zigzag double hydrogen-bonding-chain is generated by the intermolecular M-bipy ···anion···bipy- M hydrogen bonding interactions between the chelating ligands of bipy and anion.
YAO Jing-CaiYAO Feng-JuanGUO Jin-BoHUANG WeiGOU Shao-Hua
A Ni（Ⅱ） supramolecular complex,[Ni 2 （btec）（3py） 2 （H 2 O） 8 ]（H 2 O） 4 （1）,has been synthesized by Ni（ClO 4） 2 ·6H 2 O,benzene-1,2,4,5-tetracarboxylic acid （H 4 btec） and terminal ligand 3-hydroxypyridine （3py） in aqueous solution.The title compound crystallizes in triclinic system,space group P1,with a=8.5637（12）,b=9.4138（13）,c=10.3611（14）,α=67.9540（10）,β=85.1740（10）,γ=76.9890（10）°,V=754.33（18） 3,Z=2,M r=386.96,D c=1.704 Mg/m 3,μ=1.345 mm-1,F（000）=402,the final R=0.0222 and wR=0.0563 for 2675 observed reflections with I 2σ（Ⅰ）.The adjacent discrete molecules are further self-assembled by intermolecular π-π and O-H···O hydrogen bonding interactions to construct a 3D supramolecular framework.Magnetic measurement shows weak ferromagnetic interaction in the range of 2～300 K.
