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  High field EPR and DFT study of stable organic radicals in lignin: Influence of the extraction process, botanical origin and protonation reactions on the radical g-tensor.

Bährle, C., Nick, T. U., Bennati, M., Jeschke, G., & Vogel, F. (2015). High field EPR and DFT study of stable organic radicals in lignin: Influence of the extraction process, botanical origin and protonation reactions on the radical g-tensor. Journal of Physical Chemistry A, 119(24), 6475-6482. doi:10.1021/acs.jpca.5b02200.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-12DE-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CEC0-4
Genre: Journal Article

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Bährle, C., Author
Nick, T. U.1, Author              
Bennati, M.1, Author              
Jeschke, G., Author
Vogel, F., Author
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1Research Group of Electron Paramagnetic Resonance, MPI for biophysical chemistry, Max Planck Society, ou_578606              

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 Abstract: The radical concentrations and g factors of stable organic radicals in different lignin preparations were determined by X-band EPR at 9 GHz. We observed that the g factor these radicals are largely determined by the extraction process and not by the botanical origin of the lignin. The parameter mostly influencing the g factor is the pH value during lignin extraction. This effect was studied in depth using high-field EPR spectroscopy at 263 GHz. We were able to determine the gxx, gyy and gzz component of the g tensor of the stable organic radicals in lignin. With the enhanced resolution of high-field EPR distinct radical species could be found in this complex polymer. The radical species are assigned to substituted o-semiquinone radicals and can exist in different protonation states SH3, SH2, SH1- and S2-. The proposed model structures are supported by DFT calculations. The g principal values of the proposed structure were all in reasonable agreement with the experiments.

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Language(s): eng - English
 Dates: 2015-05-152015-06-18
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.jpca.5b02200
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Title: Journal of Physical Chemistry A
Source Genre: Journal
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Pages: - Volume / Issue: 119 (24) Sequence Number: - Start / End Page: 6475 - 6482 Identifier: -