An ENDOR study of the slow intramolecular motion in the CH2COO-radical
- 10 October 1988
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 65 (2) , 447-453
- https://doi.org/10.1080/00268978800101161
Abstract
The radicals CH2COO- (I) and CH3CHCOO- (II) produced by gamma irradiation at room temperature of a single crystal of zinc acetate dihydrate are studied by ENDOR spectroscopy. The signal intensity of radical I is found to be strongly temperature dependent in the range 130-200 K. The ENDOR enhancement has a maximum at T ∼ 170 K. It is shown that this behaviour is a consequence of the hindered rotation of the -CH2 group, which is very slow in this temperature range with respect to the EPR time scale. The enhancements are calculated by taking into account the nuclear relaxation rate due to the exchange motion and the dynamical parameters of the motion are obtained.Keywords
This publication has 12 references indexed in Scilit:
- Hindered rotation of methylene groups in irradiated zinc acetate dihydrate: a double modulation ESR studyChemical Physics Letters, 1986
- Methyl dynamics studied by ENDOR spectroscopy: a new methodMolecular Physics, 1986
- Electron spin echo studies of the internal motion of radicals in crystals: Phase memory vs correlation timeThe Journal of Chemical Physics, 1982
- Electron spin resonance studies of ion association. Part 7.—Effects of slow intramolecular cation exchange on the ENDOR of potassium-2,5-di-t-butyl p-benzoquinoneJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1978
- Electron-electron double resonance of irradiated single crystals of zinc acetate and malonic acid. Influence of nuclear spin exchangeThe Journal of Physical Chemistry, 1973
- Electron spin-lattice relaxation in molecular crystals: S =
1 2 Chemical Physics Letters, 1972 - Nonadiabatic Effects in the Internal Rotation of ·CH2COO− in Irradiated Zinc Acetate DihydrateThe Journal of Chemical Physics, 1970
- EPR Study of Irradiated Zinc Acetate Dihydrate Single CrystalsThe Journal of Chemical Physics, 1968
- Electron Spin Resonance of X-Irradiated Single Crystals of Zinc Acetate Dihydrate: Hindered Rotation of Methylene Group in a Free Radical CH2COO−Bulletin of the Chemical Society of Japan, 1968
- The crystal structure of zinc acetate dihydrate, Zn(CH3COO)2.2H2OActa Crystallographica, 1953