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In the title mixed-ligand metal-organic polymeric compound, {[Cd(C14H8O6S)(C16H16N2)]·3H2O}n, the asymmetric unit contains a crystallographically unique CdII atom, one doubly deprotonated 4,4'-sulfonyl­dibenzoic acid (H2SDBA) ligand, one 3,4,7,8-tetra­methyl-1,10-phenanthroline (TMPHEN) mol­ecule and three solvent water mol­ecules. Each CdII centre is six-coordinated by two O atoms from a chelating carboxyl­ate group of a SDBA2- ligand, two O atoms from monodentate carboxyl­ate groups of two different SDBA2- ligands and two N atoms from a chelating TMPHEN ligand. There are two coordination patterns for the carboxyl­ate groups of the SDBA2- ligand, with one in a [mu]1-[eta]1:[eta]1 chelating mode and the other in a [mu]2-[eta]1:[eta]1 bis-monodentate mode. Single-crystal X-ray diffraction analysis revealed that the title compound is a one-dimensional double-chain polymer containing 28-membered rings based on the [Cd2(CO2)2] rhomboid subunit. More inter­estingly, a chair-shaped water hexa­mer cluster is observed in the compound.
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