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.