Synthesis and X-ray crystal structure of trimesitylrhodium(III)

Abstract
The first neutral homoleptic aryl of rhodium(III), Rh(2,4,6-Me3C6H2)3, has been made by interaction of RhCl3(C4H8S)3 and mesitylmagnesium bromide; the X-ray crystal structure suggests that there is ‘agostic’ interaction between Rh and an ortho-CH3 group in a distorted fac-octahedral geometry, but solution spectroscopic data show no evidence for agostic hydrogen bonding; 1H NMR spectra over a temperature range indicate synchronized rotation of the mesityl group about the Rh–C bond for which ΔG is ca. 63 kJ mol–1.

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