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Two 3D coordination polymers,[Tb3(BDC)4.5(H2O)(DMF)2]n(1)and [Tb2(BDC)3(H2O)2(DMF)2]n(2)(H2BDC=1,4-benzenedicarboxylic acid),have been synthesized and structurally characterized by single-crystal X-ray diffraction.