F-19 NMR study of comparative polarity of metal-oxygen and metal-sulfur bonds formed by trans-2-CH3C6H4M(PEt3)(2) (M=Ni, Pd, Pt) groups

A series of organometallic 4-fluorophenoxides, 4-fluorobenzoates, and 4-fluorothiophenoxides containing trans-2-CH3C6H4M(PEt3)(2) (M = Ni, Pd, Pt) groups was synthesized. Based on the F-19 NMR study, the data on the comparative polarity of the M-O and M-S bonds and comparative electronegativity of the indicated groups were obtained. The results indicate that the group electronegativities do not change in parallel to the electronegativities of the central metal atoms, and their sequence may vary as the nature of the heteroatom bonded to these groups changes.