Proton and phosphorus-31 nuclear magnetic resonance spectra of octahedral trisdimethylphenylphosphine complexes with meridional configurations

Abstract

Certain complexes of types mer-[MoOX₂(Me₂PhP)₃] and mer-[OsX₂L(Me₂PhP)₃](X = anionic ligand, L = neutral ligand) give ¹H spectra that differ significantly from that expected from a virtually coupled pair of trans-phosphines with an isolated unique phosphine. Calculations of [AM₃S₃]₂BX- spectra indicate that the anomalies in the spectra of the unique phosphines could derive from near zero shift differences for the ³¹P nuclei, and this interpretation is confirmed by measurement of the ³¹P spectra at 24·29 MHz and ¹H spectra at 220 MHz.