Proton spin–lattice relaxation times (T1) have been measured in methyl deuterated para‐azoxyanisole (PAA‐d6) and in ring deuterated para‐azoxyanisole (PAA‐d8) samples as functions of frequency and temperature. When compared with recent order fluctuation theory, the agreement between theory and experiment is not as satisfactory for the intermolecular contribution to the spin–lattice relaxation as for the intramolecular contribution. Deuteron spin–lattice relaxation times (T1Q) have also been measured in a ring deuterated p‐methoxybenzylidene p‐n‐butylaniline (MBBA‐d8) sample. The above order fluctuation theory fails to predict the observed temperature dependence and the observed frequency independence of T1Q if the correlation time τc for local motions is taken to be one‐third the dielectric relaxation time τD. However, a fair agreement is obtained if one uses τc= (1/100) τD, a value consistent with Ref. 6.
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15 April 1977
Research Article|
April 15 1977
A proton and deuteron spin–lattice relaxation study of the partially deuterated nematogens PAA and MBBA
J. J. Visintainer;
J. J. Visintainer
Department of Physics, University of Winnipeg, Winnipeg, Canada
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Ronald Y. Dong;
Ronald Y. Dong
Department of Physics, University of Winnipeg, Winnipeg, Canada
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E. Bock;
E. Bock
Department of Physics, University of Winnipeg, Winnipeg, Canada
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E. Tomchuk;
E. Tomchuk
Department of Physics, University of Winnipeg, Winnipeg, Canada
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David B. Dewey;
David B. Dewey
Department of Chemistry, University of Texas, Austin, Texas
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An‐Li Kuo;
An‐Li Kuo
Department of Chemistry, University of Texas, Austin, Texas
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Chas. G. Wade
Chas. G. Wade
Department of Chemistry, University of Texas, Austin, Texas
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J. Chem. Phys. 66, 3343–3346 (1977)
Citation
J. J. Visintainer, Ronald Y. Dong, E. Bock, E. Tomchuk, David B. Dewey, An‐Li Kuo, Chas. G. Wade; A proton and deuteron spin–lattice relaxation study of the partially deuterated nematogens PAA and MBBA. J. Chem. Phys. 15 April 1977; 66 (8): 3343–3346. https://doi.org/10.1063/1.434418
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