Syntheses and crystal structures of cadmium complexes with thiophene-dicarboxylate and bipyridine-like ligands

Two new coordination polymers [Cd(tdc)(bpy)(H2O)](n) (1) and [Cd(tdc)(phen)](n) (2) (H(2)tdc thiophene-2,5-dicarboxylic acid, bpy = 2,2'-bipyridine and phen 1,10-phenanthroline) have been synthesized under hydrothermal condition. Their crystal structures have been established by X-ray single-crystal diffraction. Complex 1 crystallizes in the orthorhombic space group Fdd2 with a = 14.757(7), b = 45.38(2), c = 10.518(5) angstrom, V = 7044(6) angstrom(3), Z = 16; 2 in the monoclinic space group P2(1)/c with a = 7.262(1), b = 21.970(2), c = 10.051 (1) angstrom, beta = 105.01 (1)degrees, V = 1548.8(2) angstrom(3), Z = 4. Both of them are double-stranded chains and further assembled into three-dimensional networks by pi-pi stacking interactions. 1 and 2 are stable in air, and show blue photoluminescence at 415 nm and 410 nm, respectively.