Cu(II) complexes of N,N-diethyl-2-picolinamine N-oxide

Cu(II) complexes have been prepared with N,N-diethyl-2-picolinamine N-oxide (DEA) employing the perchlorate, tetrafluoroborate, nitrate, chloride and bromide salts. A single unique solid was isolated for each Cu(II) salt with the following stoichiometries: Cu(DEA)₂X₂(XClO₄ and BF₄) and Cu(DEA)X₂(XNO₃, Cl and Br). Characterization has been accomplished primarily by IR, electronic and ESR spectral measurements of the solid state complexes. Significant, though not as great as with lighter ligands of the same series, changes occurred when spectral measurements of acetonitrile or nitromethane solutions were attempted. DEA was found to bind to Cu(II) exclusively as a bidentate ligand via the N-oxide oxygen and the amine nitrogen.