Hydrogen Bonding of Hydrazoic Acid in Solid Nitrogen

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Abstract
The infrared spectrum of hydrogen bonded HN3 dimers in solid nitrogen has been determined. A dimer band at 387 cm−1, assigned to the torsional distortion of the hydrogen bond, indicates the dimer has an open, not a cyclic structure. The hydrogen bond bending force constant is 0.09 mdyn/Å. The hydrogen bond frequency shift in the N–H stretching mode is 150 cm−1, which, by comparison to similar systems, suggests a hydrogen bond energy of about 2 kcal/mole. The infrared spectrum of monomeric HN3 casts doubt upon the earlier gas‐phase assignment of ν6. According to the matrix spectrum, the band center is more likely to be near 588 cm−1.