Synthesis, Structure and Properties of a Boron-substituted Phosphorane Bearing N,O-Bidentate Ligands

Abstract An anionic boron-substituted phosphorane, a phosphoranyl-triarylborate, was synthesised by stabilising the pentacoordinated phosphorus atom with a pair of N,O-bidentate ligands. Its structure was characterised by NMR spectroscopy and X-ray crystallographic analysis. The 11B and 31P NMR spectral data showed large s-character of the phosphorus–boron bond. DFT calculations revealed the charge distributions and molecular orbitals. The first oxidation potential of the phosphoranyl-borate was corresponded to the oxidation of the N,O-bidentate ligands from the distribution of the HOMO of the anion moiety.