| Abstract: | Reaction of LWI(CO)n L=hydrotris(3,5-dimethylpyrazol-1-yl)borate, n=2, 3] with NH4S2PR2] R=OEt, OPri, (−)-mentholate (R*), Ph] in acetonitrile or THF results in the formation of the dithio ligand complexes LW(S2PR2-S)(CO)2. The yellow–orange, diamagnetic complexes exhibit IR spectra featuring two ν(CO) bands at ca. 1950 and 1840 cm−1 and 1H-NMR spectra consistent with fluxional behavior in solution. Crystallographic characterisation of LW{S2P(OPri)2-S}(CO)2 revealed a six-coordinate, distorted octahedral complex composed of a tungsten center coordinated by a monodentate dithiophosphate ligand, two cis carbonyl ligands, and a facial, tridentate L ligand. Unlike analogous complexes bearing strictly monodentate sulfur donor ligands, the LW(S2PR2)(CO)2 complexes undergo reactions with oxygen atom donors to produce (carbonyl)oxo complexes of the type LWO(S2PR2-S)(CO). |
