Temperature dependence study of chlorine NQR frequency and spin-lattice relaxation time in 2-amino,-3,5-dichloropyridine

Amjadi, Mohammed Hossein Ala and Ramesh, KP and Kumar, Rajendra N and Ramakrishna, J (1999) Temperature dependence study of chlorine NQR frequency and spin-lattice relaxation time in 2-amino,-3,5-dichloropyridine. In: Magnetic Resonance in Chemistry, 37 (10). 693-700 .

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Abstract

Chlorine-35 NQR frequency and spin-lattice relaxation time measurements as a function of temperature in the range 77-300 K were carried out on 2-amino-3,5-dichloropyridine. Two NQR signals were observed and were assigned to the two chlorines present in the molecule using the additive model for substituent effects. The temperature dependence of the NQR frequency was analysed in terms of the torsional oscillations of the molecule and the torsional frequencies and their temperature dependence were calculated numerically using a two-mode approximation. The temperature dependence of the NQR spin-lattice relaxation time was found to be mainly due to the torsional oscillations of the molecule, with anharmonicity effects showing up at higher temperatures. Copyright (C) 1999 John Wiley & Sons, Ltd.

Item Type:	Journal Article
Publication:	Magnetic Resonance in Chemistry
Publisher:	John Wiley and Sons
Additional Information:	Copyright of this article belongs to John Wiley and Sons.
Keywords:	NMR;NQR;2-amino-3,5-dichloropyridine;torsional frequency; torsional oscillations;spin–lattice relaxation time
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	02 Jul 2011 06:07
Last Modified:	02 Jul 2011 06:07
URI:	http://eprints.iisc.ac.in/id/eprint/38840

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