Tricyclohexylphosphine derivatives of bis(2,6-difluorophenoxide)cadmium: a solution and solid-state NMR study.
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The synthesis of Cd(O-2,6-F 2 C 6 H 3 ) 2 (PCy 3 ) 2 has been achieved by the reaction of Cd[N(SiMe 3 ) 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 113 Cd NMR spectra of this derivative suggest that a facile solution equilibrium exists between it and its dimeric monophosphine analogue and free PCy 3 . At ambient temperature, the equilibrium lies strongly in favor of the dimeric complexes, whereas at -80 C, the monomeric complex is dominant.