Acta Cryst. (2008). E64, m564-m565  [ doi:10.1107/S1600536808006594 ]

4-(4-Pyridyl)pyridinium bis(pyridine-2,6-dicarboxylato)chromium(III) tetrahydrate

J. Soleimannejad, H. Aghabozorg and S. Hooshmand

Abstract: 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 Cr^III atom, formed by two tridentate pyridine-2,6-dicarboxylate, pydc^2-, groups. Intermolecular O-HO, N-HO and C-HO hydrogen bonds, and C-O stacking interactions (with distances of 3.3390 (13) and 3.4575 (13) Å) connect the various components into a supramolecular structure.

Online 20 March 2008

Copyright © International Union of Crystallography
IUCr Webmaster