Doxyl nitroxide probes and the intrinsic flexibility gradient. A slow-motional line shape analysis study

Michelle S. Broido, Eva Meirovitch

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7 Scopus citations

Abstract

The ESR spectra of seven doxyl-labeled stearic acids and stearic methyl esters dissolved in the liquid crystalline solvent Phase V have been examined over a wide range of temperature with the intent of addressing both the question of the intrinsic flexibility gradient of such probes in a gradient-free environment and questions related to the dynamics and ordering details of such systems. We find that slow-motional effects are observable in the ESR spectra at temperatures as high as 45°C and that with the full line shape analysis derived from the stochastic Liouville equation a wealth of information is obtainable from these systems. Our results support the model of ah intrinsic flexibility gradient originating at the center of mass of the probe; further, the spectra are not interpretable without invoking a dependence of solute dynamics on environment such as that arising from anisotropic viscosity.

Original languageEnglish
Pages (from-to)1635-1643
Number of pages9
JournalJournal of Physical Chemistry
Volume87
Issue number9
DOIs
StatePublished - 1983
Externally publishedYes

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