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A cadmium coordination polymer {[Cd(pdpy)(H2O)2]·SUL·(H2O)0.5}n(pdpy = piperazine-1,4-diylbis(pyridine-4-ylmethanone),SUL = 5-sulphosalicylic acid)have been prepared under hydrothermal condi tions and characterized by single crystal X-ray diffraction,IR spectroscopy,and elemental analyses.