Synthesis and Crystal Structure of a New Cadmium(Ⅱ) Supramolecular Network Containing Chelating Imidazole-4-carboxylate Ligand

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) ,V=1214.3(3) 3,Z=4,Mr=370.60,Dc=2.027 mg/m3,F(000)=728,μ(MoKα)=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=236nm) in the solid state.