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One new mixed-ligand coordination polymer,namely[Co2（btc）（bpdc）0.5（py）3]n（1）,was hydrothermally synthesized using biphenyl-2,4,4’-tricarboxylic acid（H3btc） as a main building block,along with two auxiliary ligands（H2bpdc = 2,2’-bipyridine-5,5’-dicarboxyli