Reaction of acyl(hydrido)cobalt(III) complexes with (2-diphenylphosphanyl)thiophenol and the influence of chelating ligands containing hard/soft donor atoms on the stability of cobalt complexes

The reaction of acyl(hydrido)cobalt(III) complexes CoIII(O∩CO)(H)(PMe3)3 (1–5) with (2-diphenylphosphanyl)thiophenol afforded four types of complexes CoIII(O∩CO)(P∩S)(PMe3)2 (6–7), CoIII(O∩CO)(O∩OHC)(PMe3)2 (11–15), CoI(P∩S)(PMe3)3 (16), and CoII(P∩S)2(PMe3) (17). A mechanism for the formation of these complexes is proposed. The influences of chelating ligands containing hard/soft donor atoms on the stability of the cobalt complexes in different oxidation states are discussed with respect to the HSAB concept.

Graphical abstractThe reaction of acyl(hydrido)cobalt(III) complexes 1–5 with (2-diphenylphosphanyl)thiophenol afforded a mixture products composed of compounds 6–7, 11–15, 16, and 17. A mechanism for the formation of these complexes is proposed. The influences of chelating ligands containing hard/soft donor atoms on the stability of the cobalt complexes in different oxidation states are discussed in terms of the HSAB concept.Figure optionsDownload full-size imageDownload as PowerPoint slide