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Dynamic behaviour of a nitroxide biradical undergoing multiple internal motions: An ESR and 13 C NMR relaxation study
Author(s) -
Chachaty Claude,
Gambarelli Serge,
Rassat André
Publication year - 1995
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260331327
Subject(s) - chemistry , nitroxide mediated radical polymerization , conformational isomerism , diamagnetism , relaxation (psychology) , adipate , electron paramagnetic resonance , spectral line , nuclear magnetic resonance , spin (aerodynamics) , nmr spectra database , molecule , polymer , thermodynamics , polymer chemistry , magnetic field , polymerization , organic chemistry , psychology , social psychology , physics , radical polymerization , quantum mechanics , astronomy
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.