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A new metal-organic coordination polymer [Co(2-pya)2(4,4'-bipy)]2n·[(4,4'-bipy)0.5· H2O]2n(2-pya = 2-pyridinecarboxylic acid,4,4'-bipy = 4,4'-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by ele