(19)F NMR study of relative polarities and reactivities of N-H, N-Hg, and N-Au bonds in 2-(4-fluorophenyl)benzimidazole and its PhHg and Ph3PAu derivatives in intermolecular exchange

Article abstract of DOI:10.1007/BF00714443

It has been shown by the (19)F NMR method that the relative polarities of nitrogen-element bonds in 2-(4-fluorophenyl)benzimidazole and its PhHg and Ph3PAu derivatives increase in the order N-H < N-Hg < N-Au.Intermolecular exchange reactions of hydrogen-mercury, hydrogen-gold, and mercury-gold types in binary mixtures of these compounds have been studied by dynamic (19)F NMR.It has been found that these reactions occur by a bimolecular associative mechanism and that the N-H bond is substantially less reactive than the N-Hg and N-Au bonds, which have identical reactivities within the limits of sensitivity of the method used. - Keywords: bond polarity, (19)F NMR, exchange reactions, kinetics and mechanism, 2-(4-fluorophenyl)benzimidazole, PhHg and Ph3PAu derivatives