Volume 64, 1968

Electron spin resonance studies of fundamental processes in radiation- and photo-chemistry. Part 5.—Dissociative electron capture in amino acids at low temperatures

Abstract

The radiolysis of α-amino acids RCH(NH+3)COO where R = H, CH3, CH2CH3, CH2COOH and CH3SO3H has been examined by e.s.r. methods. After γ-irradiation at 77°K the predominant e.s.r. spectrum observed at this temperature corresponds to the protonated molecular-anions RCH(NH+3)ĊOOH formed by electron capture followed by proton transfer. These ions are de-aminated at a higher temperature to yield the radicals RCHCOOH, known from earlier studies to be stable at room temperature. When irradiated in aqueous alkaline glasses at 77°K only trapped electrons, Oaq and RCHĊOO radicals are observed and it is concluded that the non-protonated species RCH(NH+3)ĊOO2– are insufficiently stable for trapping in this matrix. Single crystal data were analyzed to give the proton hyperfine tensors for the species CH3CH(NH+3)ĊOOH, HOSO2CH2CH(NH+3)ĊOOH and HOSO2CH2ĊHCOO, the latter two species being derived from cysteic acid.

Article information

Article type
Paper

Trans. Faraday Soc., 1968,64, 582-595

Electron spin resonance studies of fundamental processes in radiation- and photo-chemistry. Part 5.—Dissociative electron capture in amino acids at low temperatures

P. B. Ayscough and A. K. Roy, Trans. Faraday Soc., 1968, 64, 582 DOI: 10.1039/TF9686400582

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