Free-Radical Formation by Ultraviolet Irradiation in Single Crystals of Cysteine HCl
- 1 August 1966
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 45 (3) , 809-811
- https://doi.org/10.1063/1.1727685
Abstract
Electron spin resonance spectroscopy was used to study free‐radical formation in single crystals of cysteine HCl exposed to ultraviolet irradiation. Irradiation at 77°K and momentary warming produced the free radical S–CH2–CH(NH3Cl)COOH. Further irradiation at 77°K using longer wavelengths causes a quantitative transformation of the paramagnetic absorption which is attributed to the formation of the radical ion −S–CH2–CH–NH3Cl. The transformation is reversible and, upon warming, the initial radical is reconstituted.Keywords
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