The NMR Spectra of Oriented I, I-Difluoroethylene, and Tetrafluoroethylene

Abstract

An analysis of the NMR spectra of I, I-difluoroethylene and tetrafluoroethylene in a nematic solvent is given. The results are compared with previous findings on ethylene itself. The geometrical structures of the fluorine substituted molecules, as determined from NMR data neglecting the anisotropy of the electron coupled spin-spin interaction, deviate considerably from structural data obtained by other methods. It is concluded that there is a strong anisotropy in the electron coupled interactions between the ¹⁹Fnuclei.