{"title":"The isomer distribution of C6H6 products from the propargyl radical gas-phase recombination investigated by threshold-photoelectron spectroscopy","authors":"Helgi Rafn Hrodmarsson, Gustavo A. Garcia, Lyna Bourehil, Laurent Nahon, Bérenger Gans, Séverine Boyé-Péronne, Jean-Claude Guillemin, Jean-Christophe Loison","doi":"10.1038/s42004-024-01239-7","DOIUrl":null,"url":null,"abstract":"The resonance-stabilization of the propargyl radical (C3H3) makes it among the most important reactive intermediates in extreme environments and grants it a long enough lifetime to recombine in both terrestrial combustion media and cold molecular clouds in space. This makes the propargyl self-reaction a pivotal step in the formation of benzene, the first aromatic ring, to eventually lead to polycyclic aromatic hydrocarbons in a variety of environments. In this work, by producing propargyl radicals in a flow tube where propyne reacted with F atoms and probing the reaction products by mass-selected threshold-photoelectron spectroscopy (TPES), we identified eight C6H6 products in total, including benzene. On top of providing the first comprehensive measurements of the branching ratios of the eight identified C6H6 isomers in the propargyl self reaction products (4 mbar, 298 K conditions), this study also highlights the advantages and disadvantages of using isomer-selective TPES to identify and quantify reaction products. The propargyl radical (C3H3) self-reaction is a pivotal step in the formation of benzene in nature, but experimental validation for the complex reaction channels and products is challenging to obtain. Here, the authors produce propargyl radicals in a flow tube and report the branching ratios of eight identified C6H6 isomers in the propargyl self-reaction using isomer-selective threshold-photoelectron spectroscopy.","PeriodicalId":10529,"journal":{"name":"Communications Chemistry","volume":null,"pages":null},"PeriodicalIF":5.9000,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11245511/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Communications Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.nature.com/articles/s42004-024-01239-7","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The resonance-stabilization of the propargyl radical (C3H3) makes it among the most important reactive intermediates in extreme environments and grants it a long enough lifetime to recombine in both terrestrial combustion media and cold molecular clouds in space. This makes the propargyl self-reaction a pivotal step in the formation of benzene, the first aromatic ring, to eventually lead to polycyclic aromatic hydrocarbons in a variety of environments. In this work, by producing propargyl radicals in a flow tube where propyne reacted with F atoms and probing the reaction products by mass-selected threshold-photoelectron spectroscopy (TPES), we identified eight C6H6 products in total, including benzene. On top of providing the first comprehensive measurements of the branching ratios of the eight identified C6H6 isomers in the propargyl self reaction products (4 mbar, 298 K conditions), this study also highlights the advantages and disadvantages of using isomer-selective TPES to identify and quantify reaction products. The propargyl radical (C3H3) self-reaction is a pivotal step in the formation of benzene in nature, but experimental validation for the complex reaction channels and products is challenging to obtain. Here, the authors produce propargyl radicals in a flow tube and report the branching ratios of eight identified C6H6 isomers in the propargyl self-reaction using isomer-selective threshold-photoelectron spectroscopy.
期刊介绍:
Communications Chemistry is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the chemical sciences. Research papers published by the journal represent significant advances bringing new chemical insight to a specialized area of research. We also aim to provide a community forum for issues of importance to all chemists, regardless of sub-discipline.