Vibrational Spectrum of Hydrazine-<i>d</i>4 and a Raman Study of Hydrogen Bonding in Hydrazine

Abstract

The infrared spectra of liquid, solid, and gaseous tetradeuterated hydrazine have been measured from 250 to 4000 cm−1. Fine structure was resolved for three of the perpendicular fundamental bands of the assumed symmetric top. The Raman spectra of liquid hydrazine and tetradeuterated hydrazine have been recorded and depolarization values measured. A complete vibrational analysis based on band type, position, and depolarization values is given which satisfies the product rule for both the a and b vibrational symmetry species. The intensity of the 3189-cm−1 band of hydrazine has been studied as a function of temperature. ΔH° for H-bond formation in hydrazine is found to be − 1450 cal/mole. The relative intensity of the 3189-cm−1 band to that of the 3260-cm−1 band has been studied as a function of concentration in dimethylsulfoxide and indicates that part of the intensity of the 3189-cm−1 band arises from a vibrational mode of the hydrazine monomer.