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Three 3D lanthanide coordination polymer {[Ln2(1,4-pda)3(H2O)]·2H2O}n(1,4-pda = 1,4-phenylenediacetic acid,Ln = Pr for 1,Nd for 2 and Dy for 3)has been hydrothermally synthesized and and characterized by elemental analysis,IR spectroscopy,thermogravimetric(TG)analyses and single-crystal X-ray diffraction techniques.