Tricyclohexylphosphine Derivatives of Bis(2,6-difluorophenoxide)cadmium:  A Solution and Solid-State NMR Study

Abstract

The synthesis of Cd(O-2,6-F2C6H3)2(PCy3)2 has been achieved by the reaction of Cd[N(SiMe3)2]2 and 2,6-difluorophenol in THF in the presence of 2 equiv of tricyclohexylphosphine, and its distorted tetrahedral structure has been established by X-ray crystallography. Comparison of the solution and solid-state 113Cd NMR spectra of this derivative suggest that a facile solution equilibrium exists between it and its dimeric monophosphine analogue and free PCy3. At ambient temperature, the equilibrium lies strongly in favor of the dimeric complexes, whereas at −80 °C, the monomeric complex is dominant.