Dalton communications. Synthesis and structure of the first phosphine oxide complex of copper(I): evidence for a marked ‘borderline’ character of the metal centre
Abstract
The remarkable stability of [Cu(dppf)(odppf)]BF4[dppf = 1,1′-bis(diphenylphosphino)ferrocene, odppf = 1,1′-bis(oxodiphenylphosphoranyl)ferrocene], characterized in the solid state by X-ray analysis and in solution by 31P NMR spectroscopy, reveals a marked borderline character of copper(I).