[(1,2,5,6-η)-Cycloocta-1,5-diene](1-ethyl-4-isobutyl-1,2,4-triazol-5-ylidene)(triphenylphosphane)rhodium(I) tetrafluoridoborate

Abstract

A new, cationic N-heterocyclic carbene RhI complex with a tetrafluoridoborate counter-anion, [Rh(C8H12)(C8H15N3)(C18H15P)]BF4, has been synthesized and structurally characterized. There are two independent ion pairs in the asymmetric unit. Each complex cation exhibits a distorted square-planar conformation around the RhI atom. Bond lengths and bond angles are as expected for an Rh–NHC complex. There are several close, non-standard C—H...F hydrogen-bonding interactions between the ions. One of the tetrafluoridoborate anions shows statistical disorder of the F atoms.

Keywords

• crystal structure
• rhodium
• n-heterocyclic carbenes
• cationic complexes