Strength of the N–F Bonds in NF3 and of N–F and N–N Bonds in N2F4

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Abstract
The heat of formation of the difluoroamino free radical is found to be 8.9±2.5 kcal/mole. The NF2–F bond in NF3 is the weakest bond in NF3 in contrast to ammonia where the NH2–H bond is the strongest bond. The strength of the NF2–F bond is 57.1±2.5 kcal/mole while the average NF bond strength in NF2 and N2F4 is 71 kcal/mole. The strength of the N–N bond in tetrafluorohydrazine, as determined from appearance potential data, is 20.7 kcal in excellent agreement with the value 19.8 kcal found by thermal measurements.