Nuclear magnetic resonance measurement of sulphur inversion barriers in mer-trisbis(trimethylsilylmethyl) sulphidetrichloro-rhodium(III) and -iridium(III)

Variable-temperature 1H n. m. r. studies of mer-RhCl3S (CH2SiMe3) 23 and mer-IrCl3S (CH2SiMe3) 23 have yielded slightly different sulphur inversion barriers for the two different sulphide ligand environments in these complexes. In both complexes the barrier is somewhat lower for the sulphide ligand trans to chloride.