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A novel europium(Ⅲ) coordination polymer, [Eu3(pydc)3(SO4)(H2O)5(ox)0.5]·3H2O(1, H2 ox = oxalic acid, H2 pydc = pyridine-2,6-dicarboxylic acid), has been synthesized hydrothermally from the self-assembly of lanthanide ions(Eu3+) with the flexible oxa