Research Article: {μ-5-[1,3-Bis(2,4,6-trimethyl­phen­yl)-3H-imidazolium-2-yl]-2-(2-oxoethenyl-1κC1)furan-3-yl-2κC3}-μ-hydrido-bis(tetra­carbonyl­rhenium) tetra­hydro­furan 0.67-solvate

Date Published: March 01, 2012

Publisher: International Union of Crystallography

Author(s): Marilé Landman, Belinda van Westhuizen, Daniela I. Bezuidenhout, David C. Liles.


The title complex, [Re2(C27H25N2O2)H(CO)8]·0.67C4H8O, was formed as a product in the reaction of a rhenium(I)–Fischer carbene complex with a free NHC carbene. The coordination environment about the two Re atoms is slightly distorted octahedral, including a bridging H atom. The imidazolium and furan groups are almost coplanar, whereas the mesityl substituents show an almost perpendicular arrangement with respect to both heterocyclic units. Mol­ecules of the complex pack in such a way as to form channels parallel with the bc unit-cell face diagonal running through the unit face diagonal. These channels are partially occupied by tetra­hydro­furan solvent mol­ecules.

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For other examples of ketenyl complexes, see: Kreissl et al. (1976 ▶, 1977 ▶); Li et al. (2006 ▶). Recent examples of dimesityl­imidazol-2-yl groups bonded to a C atom have been reported by: Naeem et al. (2010 ▶); Chia et al. (2011 ▶).