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Matrix-isolation spectra of the system H2O2:N2 were obtained in the region 4000–300 cm—1 at 4.2°K. Spectra taken in this manner are free of complications due to association, over-all rotation, etc. The most unusual feature of these spectra is the band system at 385 and 350 cm—1 in the torsional region. This main band at 385 cm—1 is exceedingly broad for a matrix spectrum. These bands have been assigned to the n=0→1 and 1→2 torsional transitions.

Matrix isolation spectra of the system NH~H2:N2 were obtained in the region 4000-270 cm-I at 4.2°K. Spectra taken in this manner are free of complications due to association, over-all rotation, etc. The unusual features of these spectra are that the bands usually assigned to the bending modes which are present in gas-phase spectra at ",1500-1600 cm-I are not found; and, that the torsional mode is apparently split. Anomalous behavior for the 6.3-~ gas-phase band was observed.

The isomers of N2F2 have been characterized in the past by their reactivity towards mercury. Investigation of the infrared spectra showed that inactive N2F2 is trans-1,2-difluorodiazine and may be identified by the single strong band centered at 989 cm—1, with PQR structure. Active N2F2 resembles 1,1-difluorodiazine instead of a cis-isomer. This conclusion was reached by considering the mass spectrum, the chemical reactivity, and both the position of the infrared bands and their shapes. 1,1-difluorodiazine may be identified by strong bands at 1524 (PR), 952 (PQR), 896 (PR), and 737 (PQR) cm—1, respectively. Normal coordinate analyses using the Wilson FG-matrix method were performed on both isomers.