NMR Spectra of Cis and Trans 1,2- Difluoroethylene in the Gas Phase
The proton NMR spectra of cis and trans 1,2‐difluoroethylene in the gas phase include a number of peaks of significantly different relative widths. The sharp peaks in the proton spectra can be associated with transitions between states with the largest singlet fluorine spin character if the spin—rotation interaction is assumed to provide the dominant fluorine relaxation mechanism. A comparison of the spectra in the gas and liquid phases then removes the usual ambiguity in the relative sign of JAA′ and JXX′ in these AA′XX′ systems. In both cis CHFCHF and trans CHFCHF, J HH and J FF are opposite in sign.
Flynn, George W., Michiko Matsushima, John D. Baldeschwieler, and Norman C. Craig. 2004. "NMR Spectra of Cis and Trans 1,2- Difluoroethylene in the Gas Phase." The Journal of Chemical Physics 38(9): 2295-2301.
Journal of Chemical Physics
Chemistry and Biochemistry