High-Field/High-FreqHigh Field/High Frequency Epr Study on Stable Free Radicals Formed in Sucrose by Gamma-Irradiation. (Articolo in rivista)

Type
Label
  • High-Field/High-FreqHigh Field/High Frequency Epr Study on Stable Free Radicals Formed in Sucrose by Gamma-Irradiation. (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Georgieva ER, Pardi LA, Jeschke G, Gatteschi D, Sorace L, Yordanov ND (2006)
    High-Field/High-FreqHigh Field/High Frequency Epr Study on Stable Free Radicals Formed in Sucrose by Gamma-Irradiation.
    in Free radical research
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Georgieva ER, Pardi LA, Jeschke G, Gatteschi D, Sorace L, Yordanov ND (literal)
Pagina inizio
  • 553 (literal)
Pagina fine
  • 563 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 40 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Bulgarian Acad Sci, Inst Catalysis, Acad Georgi Bonchev Str,Bldg 11, BU-1113 Sofia, Bulgaria Bulgarian Acad Sci, Inst Catalysis, BU-1113 Sofia, Bulgaria CNR, Ist Proc Chimicofis, I-56100 Pisa, Italy Max Planck Inst Polymer Res, D-6500 Mainz, Germany Univ Florence, UdR INSTM, Sesto Fiorentino, Italy Univ Florence, Dept Chem, Sesto Fiorentino, Italy (literal)
Titolo
  • High-Field/High-FreqHigh Field/High Frequency Epr Study on Stable Free Radicals Formed in Sucrose by Gamma-Irradiation. (literal)
Abstract
  • The EPR spectrum of sucrose irradiated by high-energy radiation is complex due to the presence of more than one radical species. In order to decompose the spectrum and elucidate the radical magnetic parameters a high-field (HF(-)EPR) study on stable free radicals in gamma-irradiated polycrystalline sucrose (table sugar) was performed at three different high frequencies-94, 190 and 285 GHz as well as at the conventional X-band. We suggest a presence of three stable radicals R1, R2 and R3 as the main radical species. Due to the increase of g-factor resolution at high fields the g-tensors of these radicals could be extracted by accurate simulations. The moderate g-anisotropy suggests that all three radicals are carbon-centred. Results from an earlier ENDOR study on X-irradiated sucrose single crystals (Vanhaelewyn et al., Appl Radiat Isot, 52, 1221 (2000)) were used for analyzing of the spectra in more details. It was confirmed that the strongest hyperfine interaction has a relatively small anisotropy, which indicates either the absence of alpha-protons or a strongly distorted geometry of the radicals. (literal)
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