Dynamic behaviour of a nitroxide biradical undergoing multiple internal motions: An ESR and 13C NMR relaxation study
✍ Scribed by Claude Chachaty; Serge Gambarelli; André Rassat
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 378 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ESR spectra of the bis(2,2,6,6‐tetramethyl‐4‐piperidinol‐1‐oxyl) adipate biradical at several temperatures in ethanol solution were simulated, taking into account all allowed conformers corresponding to the rotational isomerism model. The probabilities of these conformers, not accessible by ESR, were derived from ^13^C spin relaxation measurement on the diamagnetic reduced form of the biradical. The least‐squares fits of ESR spectra provided the temperature dependence of the rates of internal motions and of the tumbling correlation time of the biradical and also an estimate of the electron spin exchange parameters.