COMPLEXES OF AROMATIC AMINE OXIDES . 4-SUBSTITUTED QUINOLINE 1-OXIDE COMPLEXES OF COBALT(2) AND NICKEL(2) PERCHLORATES

The coordinating properties of a series of 4-substituted quinoline 1-oxides toward nickel(II) and cobalt(II) have been investigated. The substituents studied were CH3O, CH3, H, Cl, and NO2. The compounds were assigned octahedral structures with the general formula M(4-Z-C9H6NO)6(ClO4)2 based upon analytical data and the magnetic moments 3.37-3.61 and 4.91-5.25 BM for nickel(II) and cobalt(II), respectively. The electronic spectra were studied and ligand field parameters were determined. The Dq values ranged from 790 to 874 cm-1 for the nickel(II) complexes and from 955 to 979 cm-1 for the cobalt(II) complexes. For comparison purposes, isoquinoline 2-oxide complexes Yvere also studied. Considerable evidence for π-pπ back-bonding (synergic bonding) is found and discussed. © 1968, American Chemical Society. All rights reserved.