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Three coordination polymers based on the V-shaped 4,4'-dicarboxybiphenyl sulfone (H2sdba) ligands, [Zn3(μ-OH)2(sdba)2]n·2nH2O 1, [Zn2(sdba)2(4,4'-bipy)]n·2nH2O 2 and [Zn3(sdba)3(py)2]n·n(py)·nH2O 3 (4,4'-bipy = 4,4'-bip