Static and dynamic structures of pentacarbonyl-chromium(0) and -tungsten(0) complexes of dithioether ligands: I. Symmetrical dithioether complexes and X-ray crystal structure of [W(CO) 5( tBuSCH 2S tBu)]

The complexes [M(CO) 5(RSCH 2SR)] (M  Cr, R  Et, iPr, tBu; M  W, R  Me, Et, iPr, tBu) were synthesised. Total bandshape NMR analysis was used to measure energies of inversion of the coordinated S atom in the tungsten complexes. Δ G‡ (298.15 K) values were in the range 34–42 kJ mol −1. An X-ray structure of [W(CO) 5( tBuSCH 2S tBu)] was obtained.