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Three unique metal-organic framework coordination polymers,[Eu2(bptc)(bdc)2(H2O)]n(1),[Gd2(bptc)(bdc)2(H2O)4]n(2) and [Dy2(bptc)(bdc)2(H2O)4]n(3)(1,2-H2 BDC = 1,2-benzenedicarboylic acid, H2 bptc = 4,4'-biphenyldicarboxylic acid) were synthesized by m