NMR studies of molecular dynamics in tetramethylammonium tetrabromo cadmate

Venu, K and Sastry, VSS and Ramakrishna, J (1985) NMR studies of molecular dynamics in tetramethylammonium tetrabromo cadmate. In: Chemical Physics Letters, 122 (3). pp. 280-283.

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Abstract

Internal motions in a A2BX4 compound (tetramethylammonium tetrabromo cadmate) have been investigated using proton spin—lattice relaxation time (T1) and second moment (M2) measurements in the temperature range 77 to 400 K. T1 measurements at three Larmor frequencies (10, 20 and 30 MHz) show isotropic tumbling of the tetramethylammonium group, random reorientation of methyl groups and spin—rotation interaction, and the corresponding parameters have been computed. The cw spectrum is narrow throughout the temperature range and shows side bands at the lowest temperature. This observation, along with the free-induction-decay behavior at these temperatures, is interpreted as the onset of a coherent motion, e.g. methyl group quantum tunnelling.

Item Type:	Journal Article
Publication:	Chemical Physics Letters
Publisher:	Elsevier Science
Additional Information:	The copyright of this article belongs to Elsevier Science
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	09 Nov 2009 12:18
Last Modified:	19 Sep 2010 05:31
URI:	http://eprints.iisc.ac.in/id/eprint/20083

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