A novel dinuclear pyridine carboxylic acid coordination polymer, ［Sm2(bpdc)(bdc)2(H2O)2］n (H2bpdc = 2,2′-bipyridyl-3,3′-dicarboxylate, H2bdc=1,4benzenedicarboxylate) has been hydrothermally synthesized. The resulting crystals were colorless transparent sheets. We discuss the influence of the reactant ratio, solvent, temperature and pH on the synthesis. The optimized reaction conditions were found to be a reaction temperature of 160℃, a reaction time of 72h, a cooling rate of 2℃/h, pH=5, with 5mL of deionized water as solvent, and a molar ratio of SmCl3·6H2O:2,2′-bipyridyl-3,3′dicarboxylate:1,4-benzenedicarboxylicate of 2:2:1. IR, PXRD, luminescence analysis, TG and single-crystal X-ray diffraction showed that the compound crystallizes in the monoclinic system, space group C2/c, is thermally stable up to 418℃, and shows intense fluorescence properties with highly effective radiative transitions.
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