The “Rh(PPh3)2” and “Rh(cod)” Fragments as Probes To Compare the Coordinating and Electronic Characteristics of C−SR and C−PPh2 in Heterodisubstituted Carborane Ligands
摘要:
Comparison of the coordinating and electronic characteristics of C-SR and C-PPh2 in [7-PPh2-8-SR-7,8-C2B9H10](-) has been achieved with the fragments "Rh(PPh3)(2)" and "Rh(cod)". The C-SR moiety has a strong polarizing effect on the carborane cage, depleting C-PPh2 of electronic density and shifting its position in the P-31 NMR downfield as compared to non-thioether-containing complexes. The resolution of the structure of [Rh(7-PPh2-8-SR7,8-C2B9H10)(cod)] has evidenced a stronger a donation capacity of the C-SR group as compared to the C-PPh2 group.