Determination of free radical on polycrystal of 4,4 '-bis(chloroacetyl)diphenylether: An ESR study

Ceylan Y., Usta A., Usta K., Durmaz F., Coskun A.

JOURNAL OF MOLECULAR STRUCTURE, cilt.1050, ss.69-72, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1050
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.molstruc.2013.07.011
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.69-72
  • Anahtar Kelimeler: ESR spectroscopy, Radiation effect, 4,4 '-Bis (chloroacetyl) diphenylether, DIPHENYL ETHERS, IDENTIFICATION, EPR
  • Akdeniz Üniversitesi Adresli: Evet

Özet

4,4'-Bis(chloroacetyl)diphenylether was synthesized and its polycrystal form was produced. This polycrystal sample was irradiated by gamma rays (Co-60) for 72 h. The ESR method was used to observe formation of free radical on the sample. ESR signal was not recorded from the non-irradiated sample, but the irradiated polycrystal sample exhibited complex ESR spectra. The measurements were carried out in the temperature range of 120-450 K. It was observed that the shape of the spectrum was dependent on the temperature. Two identical radicals were determined on the irradiated sample. Respectively, the spin density, hyperfine, and g values were found to be rho(Ha) = 0.53, rho(Hb) = 0.23, a(Cl) = 1.263 mT, a(Ha) = 1.486 mT, a(Hb) = 0.637 mT, and g(1) = 2.0115 for the Radical rho(Hx) = 0.22, rho(Hy) = 0.14, a(Cl) = 0.905 mT, a(Hx) = 0.615 mT, a(Hy) = 0.391 mT, and g(2) = 2.0383 for the Radical II. (C) 2013 Elsevier B.V. All rights reserved.