Comparison of the coordinating and electronic characteristics of C−SR and C−PPh 2 in [7-PPh 2 -8-SR-7,8-C 2 B 9 H 10 ] - has been achieved with the fragments “Rh(PPh 3 ) 2 ” and “Rh(cod)”. The C−SR moiety has a strong polarizing effect on the carborane cage, depleting C−PPh 2 of electronic density and shifting its position in the 31 P NMR downfield as compared to non-thioether-containing complexes. The resolution of the structure of [Rh(7-PPh 2 -8-SR-7,8-C 2 B 9 H 10 )(cod)] has evidenced a stronger σ donation capacity of the C−SR group as compared to the C−PPh 2 group.
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Teixidor et al. (1998) studied this question.
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