A Stable Sulfonato–Cobalt(III) Complex: Δ-[Co{OS(O)₂CH₂CH₂NH₂-N,O}(en)₂](ClO₄)₂

A stable sulfonato complex, (2-aminoethanesulfonato-N,O)bis(ethylenediamine-N,N′)cobalt(III) perchlorate, [Co(C₂H₆NO₃S)(C₂H₈N₂)₂](ClO₄)₂, was prepared upon oxidation of [Co{OS(O)CH₂CH₂NH₂-N,O}(en)₂]²⁺ (en = NH₂CH₂CH₂NH₂) in acid media. This sulfonato complex was resolved by SP-Sephadex column chromatography and the absolute configuration of the slower eluted (−)₅₈₉-isomer was determined by the X-ray analysis method to be Δ.

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