Electron spin resonance study of spin exchange in a nematic solvent
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 79 (8) , 1243-1247
- https://doi.org/10.1039/f29837901243
Abstract
Spin-exchange rate constants have been measured from the concentration dependence of the e.s.r. linewidths of two nitroxide radicals, TANONE (4-oxo-2,2,6,6-tetramethylpiperidino-oxy) and M-DOXYL [2-hexyl-2-(10′-methoxycarbonyldecyl)-4,4-dimethyloxazolidinyl-3-oxyl], in the isotropic and nematic phases of MBBA. Strong exchange is observed for TANONE in both phases and for M-DOXYL in the isotropic phase but the latter radical exhibits weak exchange in the nematic phase. A qualitative discussion of the nature of the radical–radical encounters affords an explanation of the observations.Keywords
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