Far-Infrared Spectra and Space Group of Crystalline Hydrazine and Hydrazine-d4

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Abstract
The infrared spectra of crystalline hydrazine and hydrazine‐d4 have been recorded from 33 to 400 cm−1. All spectral bands have been assigned to lattice vibrations according to whether they arose primarily from a translational motion or a librational mode. However, there is strong evidence that these two motions are coupled and thus may not be described accurately as one motion or the other. An attempt is made at correlation between the observed and calculated shifts upon deuteration and some simple force constant calculations have been made. Finally, the far‐infrared spectrum distinguishes between the two proposed crystal structures (C2h2 and C22) and the results are consistent only with the C22 structure.