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- Title
EPR spectral investigation of radiation-induced radicals of gallic acid.
- Authors
Tuner, Hasan
- Abstract
In the present work, spectroscopic features of the radiation-induced radicals of gallic acid compounds were investigated using electron paramagnetic resonance (EPR) spectroscopy. While un-irradiated samples presented no EPR signal, irradiated samples exhibited an EPR spectrum consisting of an intense resonance line at the center and weak lines on both sides. Detailed microwave saturation investigations were carried out to determine the origin of the experimental EPR lines. It is concluded that the two side lines of the triplet satellite originate from forbidden 'spin-flip' transitions. The spectroscopic and structural features of the radiation-induced radicals were determined using EPR spectrum fittings. The experimental EPR spectra of the two gallic acid compounds were consistent with the calculated EPR spectroscopic features of the proposed radicals. It is concluded that the most probable radicals are the cyclohexadienyl-type, $${\dot{\text{O}}}\left( {\text{OH}} \right)_{ 2} {\text{C}}_{ 6} {\text{H}}_{ 2} {\text{COOH}}$$ radicals for both compounds.
- Subjects
GALLIC acid; ELECTRON paramagnetic resonance spectroscopy; IRRADIATION; CYCLOHEXADIENYL cations; RESONANCE
- Publication
Radiation & Environmental Biophysics, 2017, Vol 56, Issue 4, p463
- ISSN
0301-634X
- Publication type
Article
- DOI
10.1007/s00411-017-0701-x