Cargando…
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...
Autores principales: | , , , , , |
---|---|
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 |
_version_ | 1784609146193051648 |
---|---|
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. |
format | Online Article Text |
id | pubmed-8639432 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT morsymohameda electronandprotonmagneticresonancespectroscopicinvestigationofanthraceneoxidation AT kawdeabdelnasserm electronandprotonmagneticresonancespectroscopicinvestigationofanthraceneoxidation AT kamranmuhammad electronandprotonmagneticresonancespectroscopicinvestigationofanthraceneoxidation AT garrisonthomasf electronandprotonmagneticresonancespectroscopicinvestigationofanthraceneoxidation AT ialiwissam electronandprotonmagneticresonancespectroscopicinvestigationofanthraceneoxidation AT alharthisalmans electronandprotonmagneticresonancespectroscopicinvestigationofanthraceneoxidation |