[(1,2,5,6-η)-Cyclo-octa-1,5-diene](1-ethyl-3-isopropyl-1,3-imidazol-2-yl-idene)(tri-phenyl-phosphane)rhodium(I) tetra-fluorido-borate.

A new -heterocyclic cationic rhodium(I) complex with a tetra-fluorido-borate counter-anion, [Rh(CHN)(CH)(CHP)]BF, has been prepared and structurally characterized. The cationic complex exhibits a distorted square-planar environment around the rhodium(I) ion. Two connections are made from rhodium(I) to the carbon atom of an -heterocylic carbene ligand and to the phospho-rus atom of a tri-phenyl-phosphane ligand.