Abstract
The complex [Rh(COD)(dppf)]ClO 4 (COD = 1,5-cyclooctadiene; dppf = Fe((η 5-C 5H 4)P(C 6H 5) 2) 2) has been prepared by removal of the chloride ligand from [RhCl(COD)] 2 by AgClO 4 in acetone, followed by addition of one equivalent of 1,1′-bis(diphenylphosphino)ferrocene. Reaction of [Rh(COD)(dppf)]ClO 4 with dihydrogen in the presence of NaBPh 4 affords the neutral complex [Rh(dppf)(η 6-C 6H 5)B(C 6H 5) 3], which has been characterized by single crystal X-ray analysis. The Rh(dppf) + ion interacts strongly with the tetraphenylborate anion, one of the C 6C 5 groups being η 6-coordinated to the metal. The plane defined by the two P atoms of the chelated bisphosphine and the Rh atom is almost perpendicular to the mean plane containing the η 6-bonded phenyl group. The 1H and 31P NMR spectra of the isolated complexes are also discussed
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