Acta Cryst. (2008). E64, m1234-m1235  [ doi:10.1107/S1600536808027700 ]

Creatininium bis(pyridine-2,6-dicarboxylato)chromate(III) pyridine-2,6-dicarboxylic acid hexahydrate

H. Aghabozorg, Z. Derikvand, M. M. Olmstead and J. Attar Gharamaleki

Abstract: The title compound, (C₄H₈N₃O)[Cr(C₇H₃NO₄)₂]·C₇H₅NO₄·6H₂O, was obtained by the reaction of Cr(NO₃)₃·9H₂O with pyridine-2,6-dicarboxylic acid (pydcH₂) and creatinine (creat) in aqueous solution (molar ratio 1:2:2). The cation is a protonated creatinine (creatH⁺) while the anion is a bis-pydc^2- Cr^III complex. The Cr^III is coordinated by four oxygen and two nitrogen atoms of two (pydc)^2- groups and has a disorted octahedral coordination environment. The structure also contains a neutral molecule of pydcH₂ that is hydrogen bonded to the creatH⁺ and six molecules of water. Extensive intermolecular interactions, including seventeen classical hydrogen bonds, two weak C-HO bonds, and C-O stacking interactions, with Ocentroid distances of 3.211 (13) and 3.300 (12) Å, connect the various components in the crystal structure.

Online 6 September 2008

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