Acta Cryst. (2004). E60, m174-m176  [ doi:10.1107/S1600536804000431 ]

A mononuclear cobalt(III) complex of the ligand N,N'-bis(pyridin-2-ylmethyl)pyrazine-2,3-dicarboxamide

D. S. Cati and H. Stoeckli-Evans

Abstract: In the complex, bis[N,N'-bis(pyridin-2-ylmethyl)pyrazine-2,3-dicarboxamide]cobalt(III) tris(perchlorate) acetonitrile 3.5-solvate, [Co(C₁₈H₁₆N₆O₂)₂](ClO₄)₃·3.5CH₃CN, the result of the reaction of Co(ClO₄)₂ with the ligand N,N'-bis(pyridin-2-ylmethyl)pyrazine-2,3-dicarboxamide, the Co^II atom has been oxidized to Co^III and has a slightly distorted octahedral coordination geometry. In each ligand, one amide NH proton has been transferred to a non-coordinated pyridine ring, thereby producing a zwitterion. This proton is hydrogen bonded to the carbonyl O atom of the adjacent deprotonated (pyridin-2-ylmethyl)amide substiutent involved in coordination.

Online 17 January 2004

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