dc.contributor.author | Buras, Zachary | |
dc.contributor.author | Chu, Te-Chun | |
dc.contributor.author | Jamal, Adeel | |
dc.contributor.author | Yee, Nathan Wa-Wai | |
dc.contributor.author | Middaugh, Joshua Eugene | |
dc.contributor.author | Green Jr, William H | |
dc.date.accessioned | 2019-03-12T19:37:30Z | |
dc.date.available | 2019-03-12T19:37:30Z | |
dc.date.issued | 2018-04 | |
dc.date.submitted | 2018-02 | |
dc.identifier.issn | 1463-9076 | |
dc.identifier.issn | 1463-9084 | |
dc.identifier.uri | http://hdl.handle.net/1721.1/120936 | |
dc.description.abstract | The C[subscript 9]H[subscript 11] potential energy surface (PES) was experimentally and theoretically explored because it is a relatively simple, prototypical alkylaromatic radical system. Although the C[subscript 9]H[subscript 11] PES has already been extensively studied both experimentally (under single-collision and thermal conditions) and theoretically, new insights were made in this work by taking a new experimental approach: flash photolysis combined with time-resolved molecular beam mass spectrometry (MBMS) and visible laser absorbance. The C[subscript 9]H[subscript 11] PES was experimentally accessed by photolytic generation of the phenyl radical and subsequent reaction with excess propene (C[subscript 6]H[subscript 5] + C[subscript 3]H[subscript 6]). The overall kinetics of C[subscript 6]H[subscript 5] + C[subscript 3]H[subscript 6] was measured using laser absorbance with high time-resolution from 300 to 700 K and was found to be in agreement with earlier measurements over a lower temperature range. Five major product channels of C[subscript 6]H[subscript 5] + C[subscript 3]H[subscript 6] were observed with MBMS at 600 and 700 K, four of which were expected: hydrogen (H)-abstraction (measured by the stable benzene, C[subscript 6]H[subscript 6], product), methyl radical (CH[subscript 3])-loss (styrene detected), H-loss (phenylpropene isomers detected) and radical adduct stabilization. The fifth, unexpected product observed was the benzyl radical, which was rationalized by the inclusion of a previously unreported pathway on the C[subscript 9]H[subscript 11] PES: aromatic-catalysed 1,2-H-migration and subsequent resonance stabilized radical (RSR, benzyl radical in this case) formation. The current theoretical understanding of the C[subscript 9]H[subscript 11] PES was supported (including the aromatic-catalyzed pathway) by quantitative comparisons between modelled and experimental MBMS results. At 700 K, the branching to styrene + CH[subscript 3] was 2-4 times greater than that of any other product channel, while benzyl radical + C[subscript 2]H[subscript 4] from the aromatic-catalyzed pathway accounted for ∼10% of the branching. Single-collision conditions were also simulated on the updated PES to explain why previous crossed molecular beam experiments did not see evidence of the aromatic-catalyzed pathway. This experimentally validated knowledge of the C[subscript 9]H[subscript 11] PES was added to the database of the open-source Reaction Mechanism Generator (RMG), which was then used to generalize the findings on the C[subscript 9]H[subscript 11] PES to a slightly more complicated alkylaromatic system. | en_US |
dc.description.sponsorship | Think Global Education Trust | en_US |
dc.publisher | Royal Society of Chemistry (RSC) | en_US |
dc.relation.isversionof | http://dx.doi.org/10.1039/C8CP01159A | en_US |
dc.rights | Creative Commons Attribution 3.0 unported license | en_US |
dc.rights.uri | https://creativecommons.org/licenses/by/3.0/ | en_US |
dc.source | Royal Society of Chemistry (RSC) | en_US |
dc.title | Phenyl radical + propene: a prototypical reaction surface for aromatic-catalyzed 1,2-hydrogen-migration and subsequent resonance-stabilized radical formation | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Buras, Zachary J., Te-Chun Chu, Adeel Jamal, Nathan W. Yee, Joshua E. Middaugh, and William H. Green. “Phenyl Radical + Propene: a Prototypical Reaction Surface for Aromatic-Catalyzed 1,2-Hydrogen-Migration and Subsequent Resonance-Stabilized Radical Formation.” Physical Chemistry Chemical Physics 20, no. 19 (2018): 13191–13214. © 2018 the Owner Societies | en_US |
dc.contributor.department | Massachusetts Institute of Technology. Department of Chemical Engineering | en_US |
dc.contributor.mitauthor | Buras, Zachary | |
dc.contributor.mitauthor | Chu, Te-Chun | |
dc.contributor.mitauthor | Jamal, Adeel | |
dc.contributor.mitauthor | Yee, Nathan Wa-Wai | |
dc.contributor.mitauthor | Middaugh, Joshua Eugene | |
dc.contributor.mitauthor | Green Jr, William H | |
dc.relation.journal | Physical Chemistry Chemical Physics | en_US |
dc.eprint.version | Final published version | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dc.date.updated | 2019-03-05T14:07:09Z | |
dspace.orderedauthors | Buras, Zachary J.; Chu, Te-Chun; Jamal, Adeel; Yee, Nathan W.; Middaugh, Joshua E.; Green, William H. | en_US |
dspace.embargo.terms | N | en_US |
dc.identifier.orcid | https://orcid.org/0000-0002-6797-8578 | |
dc.identifier.orcid | https://orcid.org/0000-0002-8475-7697 | |
dc.identifier.orcid | https://orcid.org/0000-0003-2108-3004 | |
dc.identifier.orcid | https://orcid.org/0000-0003-2603-9694 | |
mit.license | PUBLISHER_CC | en_US |