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Tritium nuclear magnetic resonance of T2, HT, and DT dissolved in nematic solvents (Articolo in rivista)

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Tritium nuclear magnetic resonance of T2, HT, and DT dissolved in nematic solvents (Articolo in rivista) (literal)

Anno

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Alternative label

E.E. Burnell, C.A. de Lange, A.L. Segre, D. Capitani, G. Angelini, G. Lilla, J.B.S. Barnhoorn (1997)
Tritium nuclear magnetic resonance of T2, HT, and DT dissolved in nematic solvents
in Physical review. E, Statistical, nonlinear, and soft matter physics (Print); American Chemical Society, Washington (Stati Uniti d'America)
(literal)

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E.E. Burnell, C.A. de Lange, A.L. Segre, D. Capitani, G. Angelini, G. Lilla, J.B.S. Barnhoorn (literal)

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Department of Chemistry, University of British Columbia, Canada Istituto di Metodologie Chimiche Laboratory of Physical Chemistry, University of Amsterdam, The Netherlands (literal)

Titolo

Tritium nuclear magnetic resonance of T2, HT, and DT dissolved in nematic solvents (literal)

Abstract

A tritium nuclear magnetic resonance study is carried out on the T-2, HT, and DT isotopomers of dihydrogen dissolved in various nematic phases, including a zero-electric-field-gradient mixture. Ab initio calculations are performed to reproduce the observed dipolar couplings. Within the framework of the ''mean-field'' approximation, the results provide support for a picture in which two independent contributions to the solute orientation can be distinguished. One contribution involves a liquid-crystal-dependent interaction between the mean solvent electric-field gradient and the solute molecular quadrupole moment. The other contribution is of unknown origin; however, it is essentially identical in all liquid crystals and it can be modeled adequately with a phenomenological mean-field interaction. A remarkable feature of this second interaction is that it causes the average orientation of the asymmetrical isotopomers, and especially of HT, to behave differently from the symmetrical species. (literal)

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