Restricted Motion of β Protons of the HOOC–CH2–CH–COOH Radical Trapped in Urea Crystals
- 1 March 1966
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 44 (5), 1958-1963
- https://doi.org/10.1063/1.1726968
Abstract
The ESR spectrum of the HOOC–CH2–CH–COOH radical, formed by γ‐ray irradiation of a mixed crystal of urea—fumaric acid, was recorded at different temperatures. Analysis of the spectra shows that the radical undergoes some restricted torsion about the Cα–Cβ bond. A value of ∼2 kcal/mole was found for the energy barrier opposing this motion.Keywords
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