| Summary: | The title compound, (C10H9N2)[Cr(C7H3NO4)2]·4H2O or (4,4′-bipyH)[Cr(pydc)2]·4H2O (where 4,4′-bipy is 4,4′-bipyridine and pydcH2 is pyridine-2,6-dicarboxylic acid), was synthesized by the reaction of chromium(III) chloride hexahydrate with pyridine-2,6-dicarboxylic acid and 4,4′-bipyridine in a 1:2:4 molar ratio in aqueous solution. This compound is composed of an anionic complex, [Cr(pydc)2]−, protonated 4,4′-bipyridine as a counter-ion, (4,4′-bipyH)+, and four uncoordinated water molecules. The anion is a six-coordinate complex with a distorted octahedral geometry around the CrIII atom, formed by two tridentate pyridine-2,6-dicarboxylate, pydc2−, groups. Intermolecular O—H...O, N—H...O and C—H...O hydrogen bonds, and C—O...π stacking interactions (with distances of 3.3390 (13) and 3.4575 (13) Å) connect the various components into a supramolecular structure.
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