19F NMR investigation of the polarities of the metal-oxygen bonds and the electronegativities of the Ph n M groups in organometallic derivatives of tris(4-fluorophenyi)stannanol

A number of Ar₃MOM*Ph₃ compounds containing Group lVB metals were synthesized or generated in solution. On the basis of¹⁹F NMR data for (4-FC₆H₄)₃SnOMPh₃ compounds, the relative polarities of the M-O bonds and relative electronegativities of the Ph₃M groups were evaluated and the latter values were found to correlate with the electronegativities of the central metal atoms. The variation of the shielding of the heavy nuclei in Ph₃SnOMPh₃ and Ph₃PbOMPh₃ does not reflect the variation in the electron density on the tin and lead atoms.