title: A highly stable N-heterocyclic carbene complex of trichloro-oxo-vanadium(V) displaying novel Cl-Ccarbene bonding interactions.
abstract: Reaction of 1,3-dimesitylimidazol-2-ylidene and trichloro-oxo-vanadium(V) yields an air stable 1:1 adduct, which demonstrates the utility of N-heterocyclic carbenes to stabilize metal complexes in high oxidation states. The molecular structure of this compound reveals that the chloride ligands cis to the carbene are oriented toward the Ccarbene atom. Density functional theory calculations show that a bonding interaction occurs between lone pairs of these chlorides and the formally unoccupied p-orbital of the carbene. Previous studies indicated that this orbital was not involved in the bonding of N-heterocyclic carbenes to transition metals. The observed interaction therefore represents a new bonding mode for these widely used ligands.
authors.affiliation: Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, Scotland G1 1XL, United Kingdom. colin.abernethy@strath.ac.uk
authors.forename: Colin D
authors.initials: CD
authors.lastname: Abernethy
authors.forename: Gareth M
authors.initials: GM
authors.lastname: Codd
authors.forename: Mark D
authors.initials: MD
authors.lastname: Spicer
authors.forename: Michelle K
authors.initials: MK
authors.lastname: Taylor