Analysis of the NMR and Double-Resonance Spectra of the Isomers of N2F2

Abstract

The assignment of F¹⁹ NMR spectra of the two isomers of N₂F₂ is consistent with the assumption of trans and cis 1,2‐difluorodiazine structures for these molecules. The qualitative features of the F¹⁹—{N¹⁴} double‐resonance spectra, and a comparison of the F¹⁹ NMR spectra at 56.4 and 40.0 Mc/sec strongly favor a cis structure over a 1,1‐difluorodiazine structure for the more reactive isomer. A comparison of the indirect N–F coupling constants for the two isomers indicates that the FNN angles are probably quite different for cis and trans N₂F₂.