ESR STUDY OF NI-III COMPLEXES WITH NITROSONAPHTHOLS AND DITHIO ACIDS

Mixed-ligand Ni-III complexes with alpha-nitroso-beta-naphthol, beta-n itroso-alpha-naphthol, o-ethylxanthate, and N,N-diethyldithiocarbamate as ligands have been studied by ESR in liquid and frozen solutions. T he degrees of symmetry distortion for the first coordination sphere of these complexes have been determined. It is shown that the transition from planar square Ni(II)L(2) complexes to more stable octahedral Ni( 2)(III)L' and Ni(III)LL(2)' complexes occurs via the radical addition mechanism. A method for trapping short-lived radicals is suggested on the basis of the complex formation scheme.