Synthesis of new η4-hexafluorobenzene complexes of ruthenium and osmium from atoms of the metals: crystal structure of [Ru(η6-C6H3Me3-1,3,5)(η4-C6F6)]

Abstract

Condensation of ruthenium or osmium atoms with mixtures of hexafluorobenzene and a second arene at –196 °C has given the novel compounds [M(η⁶-arene)(η⁴-C₆F₆)](M = Ru or Os; arene = C₆H₃Me₃-1,3,5, C₆H₄Me₂-1,3 or C₆H₆), these being further examples of compounds with a partially co-ordinated hexafluorobenzene ligand. The hapticity of the arene rings was determined from their proton and fluorine NMR spectra. This was confirmed for the specific case of [Ru(η⁶-C₆H₃Me₃-1,3,5)(η⁴-C₆F₆)] by an X-ray crystallographic study. The bis(hexafluorobenzene) compounds could not be prepared.