The infrared spectra of diazirine, diazirine-d1, and diazirine-d2 have been obtained and analyzed in the light of their cyclic structure. In contrast to the linear isomer diazomethane, the N=N bond in diazirine behaves as a normal azo linkage and absorbs in the region of 1600 cm—1 in all three isotopic derivatives. A normal coordinate analysis, derived from a potential function previously used with cyclopropane, lends reasonable support to the assignments made.
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Raymond Ettinger (1964) studied this question.
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