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The title compound, {[Mn(C24H14N2O4)(C24H16N2O4)]·0.5H2O} n , was obtained by the reaction of manganese nitrate with the ligand 4,4'-(4,4'-bi-pyridine-2,6-di-yl) di-benzoic acid under hydro-thermal conditions. The water O atom is located on a twofold rotation axis. The Mn(2+) ion is hepta-coordinated by six O atoms and one N atom from the ligands. In this structure, the ligands adopts two different forms, one completely deprotonated and one with a protonated N atom (pyridinium) and a carboxylic acid function. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds consolidate the packing, forming a three-dimensional framework.

acta crystallographica. section e

Crystal structure of poly[[μ<sub>3</sub>-4,4′-(4,4′-bipyridine-2,6-diyl)dibenzoato]{μ<sub>2</sub>-4-[6-(4-carboxyphenyl)-4,4′-bipyridin-4′-ium-2-yl]benzoato}manganese(II)] hemihydrate]

Crystal structure of poly[[μ3-4,4′-(4,4′-bipyridine-2,6-diyl)dibenzoato]{μ2-4-[6-(4-carboxyphenyl)-4,4′-bipyridin-4′-ium-2-yl]benzoato}manganese(II)] hemihydrate]

Crystal structure of poly[[μ₃-4,4′-(4,4′-bipyridine-2,6-diyl)dibenzoato]{μ₂-4-[6-(4-carboxyphenyl)-4,4′-bipyridin-4′-ium-2-yl]benzoato}manganese(II)] hemihydrate]