Research Article: Chloridobis(dimethyl­glyoximato-κ2N,N′)(ethyl pyridine-4-carboxyl­ate-κN)cobalt(III) chloro­form monosolvate

Date Published: February 01, 2012

Publisher: International Union of Crystallography

Author(s): Ning Wang, Xuzhuo Sun, Dongjin Wan, Jing Chen, Bo Li.


The title compound, [Co(C4H7N2O2)2Cl(C8H9NO2)]·CHCl3, was synthesized as a model complex of vitamin B12. The CoIII cation displays an approximately octa­hedral coordination environment, being displaced by 0.0240 (15) Å from the mean plane of the four N atoms of the equatorial plane. The O—H distances in the dimethyl­glyoximate hy­droxy groups are 0.89 (6) and 1.14 (6) Å; such long O—H bonds are very common in cobaloxime derivatives. Weak classical O—H⋯N and non-classical C—H⋯Cl hydrogen-bonding interactions further consolidate the crystal packing.

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For background on the chemistry of cobaloximes, see: Schrayzer (1968 ▶); Zangrando et al. (2003 ▶). For applications of cobaloximes in proton reduction, see: Raza­vet et al. (2005 ▶). For related structures, see: Bhuyan et al. (2007 ▶); Dutta et al. (2009 ▶); Mandal & Gupta (2005 ▶, 2007 ▶); William et al. (1973 ▶). For NMR research on O—H⋯O bridges, see: Bakac & Espenson (1984 ▶). For deprotonation of O—H⋯O bridges by BF3·Et2O, see: Magnuson & Weber (1974 ▶).