Free Radicals in Pyrimidines: ESR of γ-Irradiated 5-Cyclohexenyl-1,5-Dimethyl Barbituric Acid

ESR studies have determined that ionizing radiation damage of hexobarbital (5-cyclohexenyl-1,5-dimethylbarbituric acid) causes the formation of a free radical (A) by hydrogen abstraction from the cyclohexenyl group. Hyperfine coupling tensors were determined for coupling of the unpaired electron to...

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Veröffentlicht in:	Radiat. Res.; (United States) 1981-06, Vol.86 (3), p.411-418
Hauptverfasser:	Benson, Brent, Erich, Lester
Format:	Artikel
Sprache:	eng
Schlagworte:	550200 - Biochemistry 560110 - Radiation Effects on Biochemicals- (-1987) ACTIVATION ENERGY ANESTHETICS AZINES BARBITURATES BASIC BIOLOGICAL SCIENCES BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES BIOLOGICAL EFFECTS BIOLOGICAL RADIATION EFFECTS CENTRAL NERVOUS SYSTEM DEPRESSANTS COBALT 60 COBALT ISOTOPES Crystals DRUGS ELECTROMAGNETIC RADIATION Electron paramagnetic resonance ELECTRON SPIN RESONANCE Electrons ENERGY Free radicals GAMMA RADIATION HETEROCYCLIC COMPOUNDS Hydrogen HYPERFINE STRUCTURE HYPNOTICS AND SEDATIVES INTERMEDIATE MASS NUCLEI INTERNAL CONVERSION RADIOISOTOPES IONIZING RADIATIONS ISOMERIC TRANSITION ISOTOPES ISOTOPES Light Line spectra MAGNETIC RESONANCE MINUTES LIVING RADIOISOTOPES Molecules NUCLEI ODD-ODD NUCLEI ORGANIC COMPOUNDS ORGANIC NITROGEN COMPOUNDS ORGANIC OXYGEN COMPOUNDS Protons PYRIMIDINES RADIATION EFFECTS RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT RADIATIONS RADICALS RADIOINDUCTION RADIOISOTOPES RESONANCE YEARS LIVING RADIOISOTOPES
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Zusammenfassung:	ESR studies have determined that ionizing radiation damage of hexobarbital (5-cyclohexenyl-1,5-dimethylbarbituric acid) causes the formation of a free radical (A) by hydrogen abstraction from the cyclohexenyl group. Hyperfine coupling tensors were determined for coupling of the unpaired electron to four protons. Visible light of wavelengths near 450 nm reversibly converts this radical to a second free radical (B) which also has the unpaired electron localized in the cyclohexenyl group. The activation energy for a thermally induced reverse conversion (B → A) was determined to be 1.4 eV.
ISSN:	0033-7587 1938-5404
DOI:	10.2307/3575457