A mononuclear cobalt(III) complex of the ligandN,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 3.5-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 CoII atom has been oxidized to CoIII 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.