Structure and luminescent property of novel 2D indium(III) and 1D cadmium(II) coordination polymers based on thiophene-2,5-dicarboxylic acid

Two novel coordination polymers associated with indium and cadmium ions respectively, {[In(TCA)(OH)(H2O)]}n (1) and {[Cd(TCA)(H2O)3] · 4H2O}n (2) (H2TCA = thiophene-2,5-dicarboxylic acid), were prepared under hydrothermal conditions, and characterized by the single-crystal X-ray diffraction, element analysis, IR and luminescence spectra. Compound 1 displayed an interesting 2D lattice structure, consisted of indium ions, OH− anions and TCA ligands. In 2, seven coordinated cadmium ions were bridged by TCA ligands to generate 1D chain. The luminescent properties for 1, 2 and the TCA ligand have also been explored.