Preparation of a Stable Sulfonato-Cobalt(III) Complex by Oxidation of a Sulfinato-O Complex

A stable sulfonato complex, [Co{OS(O)2CH2CH2NH2-O,N}(en)2]2+, was prepared upon oxidation of [Co{OS(O)CH2CH2NH2-O,N}(en)2]2+ in acid media. This sulfonato complex was resolved by SP-Sephadex column chromatography (eluent: 0.1 mol dm−3 Na2[Sb2{(+)-tartrate}2]). The absolute configuration of the slower eluted (−)589-isomer was determined to be Δ by the X-ray method.