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Title: An infrared and Raman study of the phase transitions and the torsional barrier in hydrazonium sulfate, N2H6SO4
Authors: Varma, Vijay
Rao, C N R
Keywords: Vibrational mode
Phase transformation
Infrared absorption
Raman scattering
Isotopic species
Differential scanning calorimetry
Lattice distortion
Experimental study
Hydrogen bond
Inorganic compound
Issue Date: 1-Apr-1992
Publisher: Elsevier Science BV
Citation: Journal Of Molecular Structure 268(1-2), 1-11 (1992)
Abstract: Infrared and Raman spectra of N2H6SO4 have been investigated through the phase transitions at 230 K (III-II) and 483 K (II-I) and assignments made to the various vibrational modes. The assignments have been confirmed by studies of the deuterated compound. The internal modes of both N2H62+ and SO42− ions show marked changes across the phase transitions. The torsional mode of N2H62+ with a fundamental frequency of 517 cm−1 in the room-temperature phase II, disappears in the high-temperature phase, I, accompanied by the appearance of the vq bending mode at 845 cm−1. The torsional barrier is estimated to be ≈32 kJ mol−1. The hydrazonium ion in the high-temperature phase is comparable to ethane. The SO42− ion bands also show marked changes across the phase transitions, the v1 and v2 bands disappearing in the high-temperature phase. In the low-temperature phase, III, both molecular ions are more distorted than in the room-temperature phase.
Description: Restricted Access
Other Identifiers: 0022-2860
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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