Electron Paramagnetic Resonance Study of the Radiation Damage Centers in Menadione Single Crystal

Caliskan A. C., Caliskan B.

JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, cilt.25, sa.1, ss.299-312, 2022 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Sayı: 1
  • Basım Tarihi: 2022
  • Doi Numarası: 10.2339/politeknik.666923
  • Dergi Adı: JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.299-312
  • Ankara Üniversitesi Adresli: Hayır

Özet

The radiation damage centers in the Co-60-gamma rays irradiated menadione (2-methyl-1,4-naphthoquinone; Vitamin K-3; C11H8O2) single crystals were examined at 120 K by Electron Paramagnetic Resonance (EPR) spectroscopy. The presence of two radicals was detected in the compound. Both radicals are carbon centered radicals. Analysis of the EPR spectra of gamma-irradiated menadione single crystals along three different axes showed that the C(11)-H(19) bond of the compound was broken. It was determined that the unpaired electron located on the C(11) atom. The g values and the hyperfine structure constants of the radiation damage centers observed in menadione single crystal were obtained. Accuracy of experimental data was observed by simulation study.