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1H NMR study of internal motions and quantum rotational tunneling in (CH3)4NGeCl3

Mallikarjunaiah, KJ and Singh, K Jugeshwar and Ramesh, KP and Damle, R (2008) 1H NMR study of internal motions and quantum rotational tunneling in (CH3)4NGeCl3. In: Magnetic Resonance in Chemistry, 46 (2). 110 -114.

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(CH3)4NGeCl3 is prepared, characterized and studied using 1H NMR spin lattice relaxation time and second moment to understand the internal motions and quantum rotational tunneling. Proton second moment is measured at 7 MHz as function of temperature in the range 300-77 K and spin lattice relaxation time (T1) is measured at two Larmor frequencies, as a function of temperature in the range 270-17 K employing a homemade wide-line/pulsed NMR spectrometers. T1 data are analyzed in two temperature regions using relevant theoretical models. The relaxation in the higher temperatures (270-115 K) is attributed to the hindered reorientations of symmetric groups (CH3 and (CH3)4N). Broad asymmetric T1 minima observed below 115 K down to 17 K are attributed to quantum rotational tunneling of the inequivalent methyl groups.

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;1H;internal motions;spin lattice relaxation time;second moment;quantum rotational tunneling.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 22 Mar 2010 12:15
Last Modified: 01 Apr 2011 05:29
URI: http://eprints.iisc.ac.in/id/eprint/26474

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