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  • [ X ]
    Öğe
    Electron paramagnetic resonance characterization of gamma irradiation damage centers in powder of L-(+)-tartaric acid, N-acetyl-L-alanine and 1-methyl-L-histidine
    (Taylor & Francis Ltd, 2010) Baskan, M. Halim; Aydin, Murat; Osmanoglu, Semsettin; Topkaya, Ramazan
    The electron paramagnetic resonance (EPR) of -irradiated powders of l-(+)-tartaric acid, N-acetyl-l-alanine and 1-methyl-l-histidine were investigated at room temperature. Radiation damage centers are attributed to HOOCCH(OH)C(OH)COOH, CH3CHCOOH and -CH2CHCOOH radicals. The spectra were computer-simulated. Hyperfine structure constants and g-values were determined for these three radicals. The unirradiated samples showed no EPR signal. Some spectroscopic properties and suggestions concerning the possible structure of the radicals are discussed in this paper.
  • [ X ]
    Öğe
    Radiation damage produced in powder of ?-(methylamino)isobutyric acid, ?-aminoisobutyric acid methyl ester hydrochloride and diethylmalonic acid
    (Taylor & Francis Ltd, 2009) Baskan, M. Halim; Osmanoglu, Semsettin; Dicle, I. Yesim
    The electron paramagnetic resonance spectra of gamma-irradiated powders of alpha-(methylamino) isobutyric acid - CH(3)NHC(CH(3))(2)COOH, alpha-aminoisobutyric acid methyl ester hydrochloride - NH(2)(CH(3))(2)CCOOCH(3) HCl, and diethylmalonic acid - (CH(3)CH(2))(2)C(COOH)(2) have been investigated at room temperature. It has been found that gamma-irradiation produces the (CH(3))(2)(C) over dotCOOH radical in the first, the (CH(3))(2)(C) over dotCOOCH(3) radical in the second and the (CH(3)CH(2))(2)(C) over dot COOH radical in the third compound. The spectra were computer-simulated. The g values and the hyperfine coupling constants of the unpaired electron with the environmental methyl, methylene protons and OH proton were determined. The results were found to be in good agreement with the existing literature data and theoretical predictions.