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An infrared and Raman study of the phase transitions and the torsional barrier in hydrazonium sulfate, $N_2H_6S0_4$

Varma, Vijay and Rao, CNR (1992) An infrared and Raman study of the phase transitions and the torsional barrier in hydrazonium sulfate, $N_2H_6S0_4$. In: Journal of Molecular Structure, 268 (1-3). pp. 1-11.

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Abstract

Infrared and Raman spectra of $N_2H_6S0_4$ 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 confiied by studies of the deuterated compound. The internal modes of both $N_2H_6^{2+}$ and $SO_4^{2-}$ ions show marked changes across the transitions. The torisional mode of $N_2H_6^{2+}$ with a fundamental frequency of 517 $cm^{-1}$ in room-temperature phase, disappears in high-temperature phase, accompanied by appearance of $v_q$ bending mode at $845 cm^{-1}$. The torsional barrier is estimated be $\approx3KJmol^{-1}$. The hydrazonium ion in high-temperature phase is comparable to ethane. The $SO_4^{2-}$ ion bands also marked changes the phase the $v_1$ and $v_2$ phase. In the low-temperature phase,III, both molecular ions are more distorted than in the room- temperature phase.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Oct 2006
Last Modified: 19 Sep 2010 04:32
URI: http://eprints.iisc.ernet.in/id/eprint/8845

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