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Two three-dimensional lanthanide(Ⅲ) coordination polymers with the formula [Ln(PYDC)(NA)(H2O)]n [Ln=Gd(1), Eu(2), H2PYDC=pyridine-2,5-bicarboxylic acid, HNA=nicotinic acid] have been hydrothermally synthe- sized and characterized by elemental analysis, IR