2-Methylaminopyridine n-oxide complexes formed from copper (II) salts

Abstract

Complexes derived from CuX n ( n = 2, X = ClO 4 −, BF 4 −, NO 3 −, Cl − and Br −; n = 1, X = SO 4 2) and 2-methylaminopyridine N-oxide (HL) using 6:1, 4:1, 3:1 and 2:1 ligand to copper(II) mole ratios have been prepared. IR, electronic and ESR spectra used to characterize the complexes indicate a planar arrangement of four N-oxide oxygens around the Cu(II) center is favored when the preparative ligand to metal ion mole ratio was high, except when X = Cl. Both bidentate formation involving the amine function with the N-oxide group and anion coordination occurs when the ligand to metal ion ratio is low. The complexes decompose upon dissolution in many organic solvents limiting the characterization to solid-state techniques.