NMR study of molecular dynamics in hydrazinium phosphates

Ganesan, K and Damle, R and Ramakrishna, J (1990) NMR study of molecular dynamics in hydrazinium phosphates. In: Journal of Physics and Chemistry of Solids, 51 (4). pp. 297-301.

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Abstract

The proton spin-lattice relaxation time $T_1$ (at 5.4, 10 and 15 MHz) and second moment $M_2$ (at 9.8 MHz) were measured in the temperature range 77-300 K in hydrazinium dihydrogen phosphate $N_2H_5H_2PO_4$ and dihydrazinium hydrogen phosphate $(N_2H_5)_2HPO_4$. In $N_2H_5H_2PO_4$ a well-defined single proton $T_1$, minimum and three $M_2$ transitions have been observed. The $T_1$ minimum has been interpreted in terms of the $NH_3$ group reorientation with activation energy of $7.69 kcal mol^{-1}$, relaxing all protons by spin-diffusion. In $N_2H_5H_2PO_4$ a single $T_1$ minimum and a small hysteresis behaviour have been observed in the temperature dependence of $T_1$. Two $M_2$ transitions were observed. The $T_1$ minimum has been interpreted in terms of the $NH_3$ group reorientation with an activation energy of $4.4 kcal mol^{-1}$. The $M_2$ behaviour in both phosphates is explained in terms of $NH_3/NH_2$ motions.

Item Type:	Journal Article
Publication:	Journal of Physics and Chemistry of Solids
Publisher:	Elsevier Science Ltd.
Additional Information:	Copyright of this article belongs to Elsevier Science Ltd.
Keywords:	NMR;molecular dynamics;hydrazinium
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	19 Feb 2008
Last Modified:	19 Sep 2010 04:41
URI:	http://eprints.iisc.ac.in/id/eprint/12668

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