New photoluminescent coordination polymers constructed from dicarboxylate and 1,2-bis(imidazol-1-ylmethyl)benzene

Two new metal-organic frameworks, namely, Cd(Pda)(Bix)0.5(H2O) (I) and Cd2(Glut)2(Bix)(H2O) (II) (H2Pda is 1,3-phenylenediacetic acid, H2Glut is glutaric acid, and Bix is 1,4-bis(imidazol-1-ylmethyl)benzene), have been synthesized under hydrothermal conditions by employing mixed ligands with Cd(II) nitrate. In complex I, the adjacent Cd(II) atoms are bridged by two Pda ligands to result in 1D Cd(II)-Pda double chains, which are further linked by Bix ligands to generate a SQL with the node defined by a Cd(II) dimer, whereas II represents a three-dimensional coordination polymer with an unprecedented (42.5)2(44.59.68.75.82) topology, in which infinite cadmium-carboxylate chains are linked by the ligands to form a metal-organic coordination network. Moreover, the luminescence properties of two complexes have also been investigated.