Proton spin-lattice and spin-spin relaxation times of (N(CH3)3)H)(I)(TCNQ)

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Publication Type Journal Article
School or College College of Science
Department Chemistry
Creator Miller, Joel Steven; Epstein, Arthur J.
Other Author Froix, Michael F.
Title Proton spin-lattice and spin-spin relaxation times of (N(CH3)3)H)(I)(TCNQ)
Date 1978
Description Proton spin-lattice T(1) and spin-spin T(2) relaxation times are reported for (N(CH(3))(3)H)(I)(TCNQ) in the temperature range 150 to 5OOK. The overall relaxation process of the system can be described by contributions from rotation of the N(CH3)3H+ group about its symmetry axis, tumbling of that group, and the scalar and dipole interactions of the protons with the unpaired electron. Rotation of the trimethylammonium group leads to a minimum in T(1) at 21OoK, while tumbling gives rise to another minimum at 340°K. The activation energies for the two processes are 0.064 and 0.11 eV, respectively. The overall reorientation of the N(CH(3))3,H+ group, therefore, appears to dominate the T(1) process below 400°K. No direct evidence is observed in the NMR data for the reversible transition seen in the conductivity and ESR data at 16O(o)K, however, it does appear that such a transition may influence the N(CH(3))(3),H+ reorientations leading to smaller activation energies for the reorientation processes.
Type Text
Publisher American Physical Society
Volume 18
Issue 5
First Page 2046
Last Page 2049
Subject Transition; Reorientation; Conductivity
Language eng
Bibliographic Citation Froix, M. F., Epstein, A. J., & Miller, J. S. (1978). Proton spin-lattice and spin-spin relaxation times of (N(CH3)3)H)(I)(TCNQ). Physical Review B, 18(5), 2046-2049.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 712,543 bytes
Identifier ir-main,5270
ARK ark:/87278/s6c82tzx
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Date Created 2012-06-13
Date Modified 2012-06-13
ID 707429
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