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X- and gamma-radiolysis of phosphate esters. Electron spin resonance study by the spin trap technique

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Abstract

Radicals formed at X- and γ-radiolysis of glass and liquid tri-n-butylphosphate /TBP/, di-n-butylphosphate /DBP/, di/2-ethylhexyl/phosphoric acid /DEHPA/, tri-p-tolylphosphate /TTP/ and di-n-butyl-n-butyl phopsphonate /DBBPN/ were studied using the technique of spin trap using C-phenyl-N-tert. butylnitrone /PBN/ and 2-methyl-2-nitrosopropane /MNP/ as spin trap agents. When using PBN, nitroxyl radicals generated by the spin trap of hydrogen atoms and labile radicals of phosphates or phosphonate were identified after irradiation in vacuum. Radiation-chemical yield of spin adducts was observed, as well as their thermal stability at 293 K, rate constants and half-time of decay and free activation energy of the decay of spin adducts. Mechanism of generation and decay of nitroxyl radicals is discussed. The spin adducts with MNP have a relatively low stability and superposition of some adducts spectra.

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Authors and Affiliations

  1. Institute of Chemistry, Comenius University, 842 15, Bratislava, Czechoslovakia

    J. Kuruc

  2. Faculty of Chemistry, The State University of Moscow, 117234, Moscow, USSR

    V. E. Zubarev

  3. Department of Nuclear Chemistry, Faculty of Science, Comenius University, 84215, Bratislava, Czechoslovakia

    F. Macášek

Authors
  1. J. Kuruc
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  2. V. E. Zubarev
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  3. F. Macášek
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Kuruc, J., Zubarev, V.E. & Macášek, F. X- and gamma-radiolysis of phosphate esters. Electron spin resonance study by the spin trap technique. Journal of Radioanalytical and Nuclear Chemistry Letters 127, 177–192 (1988). https://doi.org/10.1007/BF02164863

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  • DOI: https://doi.org/10.1007/BF02164863

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