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Kinetics of bimolecular decay of α‐tocopheroxyl free radicals studied by ESR
Author(s) -
Rousseau-Richard C.,
Richard C.,
Martin R.
Publication year - 1988
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(88)80448-4
Subject(s) - chemistry , kinetics , radical , reaction rate constant , solvent , solvent polarity , ethanol , kinetic energy , polarity (international relations) , activation energy , photochemistry , organic chemistry , physics , quantum mechanics , biochemistry , cell
The kinetics of bimolecular decay of α‐tocopheroxyl free radicals (T . ) was studied by ESR mainly in ethanol and heptanol solvents. A second‐order kinetic law was observed during the whole course of reaction (‐d[T . ]d t = 2 k [T . ] 2 ) and the following rate constants were determined with good accuracy in the temperature range 281–321 K: ethanol: log(2 k ) = 8.2 ± 0.5 — (6.6±0.7 kcal/mol)/(2.3 RT ) M −1 ·s −1 ; heptanol: log(2 k )=6.1±0.4‐(4.3±0.6 kcal/mol)/(2.3 RT ) M −1 .s −1 . The global rate constant clearly increases with solvent polarity.