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EPR spectral investigation of radiation-induced radicals of gallic acid

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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.

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Acknowledgements

This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK), grant no: 110T825. The author also wants to thank Prof. Dr. Mustafa POLAT, Hacettepe University Department of Physics Engineering, for providing the opportunity to use the EPR spectrometer.

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  1. Department of Physics, Faculty of Art and Science, Balikesir University, Cagis, 10145, Balikesir, Turkey

    Hasan Tuner

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  1. Hasan Tuner
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Correspondence to Hasan Tuner.

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Tuner, H. EPR spectral investigation of radiation-induced radicals of gallic acid. Radiat Environ Biophys 56, 463–469 (2017). https://doi.org/10.1007/s00411-017-0701-x

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