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A new family of five lanthanide–organic coordination polymers incorporating multi-functional N-hetrocyclic dicarboxylate ligand,namely,[Ln2(Hdpp)2(dpp)2]nLn = Pr(1),Eu(2),Gd(3),Dy(4),Er(5)(H2dpp= 1-(3,4-dicarboxyphenyl)pyridin-4-ol)have been fabricated successfully through solvothermal reaction of 1-(3,4-dicarboxyphenyl)-4-hydroxypyridin-1-ium chloride with trivalent lanthanide salts,and have been characterized systematically.