Some amine N-oxide complexes of trivalent cobalt

Abstract

Three new cobalt(III) coordination complexes with bidentate amine N-oxide ligands have been synthesized and characterized via elemental analyses, equivalent weight determination, molar conductance and magnetic susceptibility measurements, and infrared and electronic absorption spectroscopy. Two are ionic complexes with general formula [CoL3](ClO4)3 where L = 2,2′-bipyridine-N,N′-dioxide and 1,10-phenanthroline N-oxide. The third is a neutral CoL′3 complex where L′ = picolinate N-oxide. The compounds are six-coordinate, diamagnetic, and have electronic absorption spectra typical of the strong field d6 configuration of trivalent cobalt. The perchlorate groups are nor coordinated to cobalt(III) in the solid state or in solution.