ELECTRON SPIN RESONANCE OF AN IRRADIATED SINGLE CRYSTAL OF L-TYROSINE-HCL
- 1 February 1969
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 62 (2) , 299-304
- https://doi.org/10.1073/pnas.62.2.299
Abstract
Analysis of the electron spin resonance (ESR) of a gamma-irradiated single crystal of L-tyrosine-HCl reveals a free radical formed by loss of an H from the hydroxyl group attached to the ring. Principal g values of the radical are g(x) = 2.0023 +/- 0.0005, g(y) = 2.0067 +/- 0.0005, and g(z) = 2.0045 +/- 0.0005, with g(x) perpendicular to the plane of the ring and g(y) along the CO bond to the ring. Analysis of the hyperfine structure of the spectra shows electron spin density on C((2)) and C((6)) to be 0.24 and on C((4)) to be 0.32. Corresponding spin densities calculated from molecular orbital theory are 0.26 and 0.31, respectively.Keywords
This publication has 1 reference indexed in Scilit:
- Hydrogen-addition radicals formed in the aromatic rings of amino acids, polyamino acids, and proteins.Proceedings of the National Academy of Sciences, 1968