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

In the complex, bis[N,N'-bis(pyridin-2-ylmethyl)pyrazine-2,3-dicarboxamide]cobalt(III) tris(perchlorate) acetonitrile 3.5solvate, [Co(C18H16N6O2)(2)](ClO4)(3).3.5CH(3)CN, the result of the reaction of Co(ClO4)(2) with the ligand N,N'-bis(pyridin-2-ylmethyl)pyrazine-2,3-dicarboxamide, the Colt 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.