Open AccessNuclear Coupling of 33 S and the Nature of Free Radicals in Irradiated Crystals of Cystine Dihydrochloride
Author(s) -
J. H. Hadley,
Walter Gordy
Publication year - 1974
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.71.8.3106
Subject(s) - radical , electron paramagnetic resonance , chemistry , irradiation , hyperfine structure , cystine , hyperfine coupling , crystallography , radiolysis , photochemistry , nuclear magnetic resonance , analytical chemistry (journal) , atomic physics , organic chemistry , physics , cysteine , nuclear physics , enzyme
The33 S hyperfine structure has been observed and analyzed in the electron spin resonance of γ-irradiated single crystals of cystine dihydrochloride at 77°K and at room temperature. The radicals observed at room temperature and previously assigned as RCH2 S are proved to be disulfide radicals, RCH2 SS. However, the RCH2 S radical is identified by the33 S measurements in samples irradiated at 77°K, annealed at 200°K, and observed at 77°K. This monosulfide radical appears to undergo reactions to form disulfide radicals at room temperature.