Donor-acceptor complexes formed by perfluoro-organo bromides and iodides wlth nitrogenous and other bases. V. Comparison of liquid phase complexes of CFI₃, C₂F₅I or C₃F₇I with Nme₃, NEt₃ or NPr₃; infrared, far-infrared and N.M.R. spectra

Abstract

Equimolar liquid mixtures of CF₃I, C₂F₅I or C₃F₇I and NMe₃, Net₃ or NPr₃ were examined by infrared, far-infrared and N.M.R. spectroscopy. In the liquid mixtures of the halides with NMe₃ or Net₃ a broad absorption band at respectively c. 100 cm^-l or c.75 cm^-1 was observed, which is assigned to the N-I stretching mode of the intermolecular complex, analogous to the complexes described in Parts 111 and IV. The fluorine resonances in CF₃I and in the ?CF₃I groups are shifted markedly upfield in the equimolar liquid mixture compared to the liquid halide. Upfield shifts caused by the amines are in the order NMe₃ > Net₃ > NPr₃. Infrared frequency shifts suggest that NMe₃ forms stronger complexes with these halides than does NEt₃.