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Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation

The work reports a method for monitoring anthracene radical-mediated oxidation reactions using electron paramagnetic resonance (EPR) spectroscopy. The formation of anthracene dimer product was well-defined using (1)H-NMR and (1)H–(1)H correlation spectroscopy (COSY). Unrestricted 3-21G/B3LYP DFT was...

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Detalles Bibliográficos
Autores principales: Morsy, Mohamed A., Kawde, Abdel-Nasser M., Kamran, Muhammad, Garrison, Thomas F., Iali, Wissam, Alharthi, Salman S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8639432/
https://www.ncbi.nlm.nih.gov/pubmed/34901508
http://dx.doi.org/10.1016/j.heliyon.2021.e08474
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author Morsy, Mohamed A.
Kawde, Abdel-Nasser M.
Kamran, Muhammad
Garrison, Thomas F.
Iali, Wissam
Alharthi, Salman S.
author_facet Morsy, Mohamed A.
Kawde, Abdel-Nasser M.
Kamran, Muhammad
Garrison, Thomas F.
Iali, Wissam
Alharthi, Salman S.
author_sort Morsy, Mohamed A.
collection PubMed
description The work reports a method for monitoring anthracene radical-mediated oxidation reactions using electron paramagnetic resonance (EPR) spectroscopy. The formation of anthracene dimer product was well-defined using (1)H-NMR and (1)H–(1)H correlation spectroscopy (COSY). Unrestricted 3-21G/B3LYP DFT was used to estimate radical hyperfine spacing (hfs), then to identify the characteristic EPR-spin transitions of anthracene radical intermediate. A detailed investigation of an anthracene oxidation reaction and its possible reaction mechanism in concentrated sulphuric acid is conducted as a model system for polyaromatic hydrocarbons. Peak-to-peak (p2p) intensities of selected EPR-spectral lines were used to evaluate anthracene's oxidation kinetic model. The findings showed that radical intermediate formation is a unimolecular autocatalytic process, dimerization is a pseudo-zero-order reaction, and the latter is the rate-determining step with a half-life of 48 ± 2 min at 25.0 °C.
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spelling pubmed-86394322021-12-09 Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation Morsy, Mohamed A. Kawde, Abdel-Nasser M. Kamran, Muhammad Garrison, Thomas F. Iali, Wissam Alharthi, Salman S. Heliyon Research Article The work reports a method for monitoring anthracene radical-mediated oxidation reactions using electron paramagnetic resonance (EPR) spectroscopy. The formation of anthracene dimer product was well-defined using (1)H-NMR and (1)H–(1)H correlation spectroscopy (COSY). Unrestricted 3-21G/B3LYP DFT was used to estimate radical hyperfine spacing (hfs), then to identify the characteristic EPR-spin transitions of anthracene radical intermediate. A detailed investigation of an anthracene oxidation reaction and its possible reaction mechanism in concentrated sulphuric acid is conducted as a model system for polyaromatic hydrocarbons. Peak-to-peak (p2p) intensities of selected EPR-spectral lines were used to evaluate anthracene's oxidation kinetic model. The findings showed that radical intermediate formation is a unimolecular autocatalytic process, dimerization is a pseudo-zero-order reaction, and the latter is the rate-determining step with a half-life of 48 ± 2 min at 25.0 °C. Elsevier 2021-11-25 /pmc/articles/PMC8639432/ /pubmed/34901508 http://dx.doi.org/10.1016/j.heliyon.2021.e08474 Text en © 2021 The Authors. Published by Elsevier Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Research Article
Morsy, Mohamed A.
Kawde, Abdel-Nasser M.
Kamran, Muhammad
Garrison, Thomas F.
Iali, Wissam
Alharthi, Salman S.
Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
title Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
title_full Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
title_fullStr Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
title_full_unstemmed Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
title_short Electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
title_sort electron and proton magnetic resonance spectroscopic investigation of anthracene oxidation
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8639432/
https://www.ncbi.nlm.nih.gov/pubmed/34901508
http://dx.doi.org/10.1016/j.heliyon.2021.e08474
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