Methanol dimer formation drastically enhances hydrogen abstraction from methanol by OH at low temperature
The kinetics of the reaction of methanol with hydroxyl radicals is revisited in light of the reported new kinetic data, measured in cold expansion beams. The rate constants exhibit an approximately 10(2)-fold increase when the temperature decreases from 200 to 50 K, a result that cannot be fully explained by tunneling, as we confirm by new calculations. These calculations also show that methanol dimers are much more reactive to hydroxyl than monomers and imply that a dimer concentration of about 30% of the equilibrium concentration can account quantitatively for the observed rates. The assumed presence of dimers is supported by the observation of cluster formation in these and other cold beams of molecules subject to hydrogen bonding. The calculations imply an important caveat with respect to the use of cold expansion beams for the study of interstellar chemistry.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2016 |
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| Erschienen: |
2016 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:18 |
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| Enthalten in: |
Physical chemistry chemical physics : PCCP - 18(2016), 32 vom: 10. Aug., Seite 22712-8 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Siebrand, Willem [VerfasserIn] |
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| Anmerkungen: |
Date Completed 29.01.2018 Date Revised 29.01.2018 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1039/c6cp04173f |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM263006379 |
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| 245 | 1 | 0 | |a Methanol dimer formation drastically enhances hydrogen abstraction from methanol by OH at low temperature |
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| 520 | |a The kinetics of the reaction of methanol with hydroxyl radicals is revisited in light of the reported new kinetic data, measured in cold expansion beams. The rate constants exhibit an approximately 10(2)-fold increase when the temperature decreases from 200 to 50 K, a result that cannot be fully explained by tunneling, as we confirm by new calculations. These calculations also show that methanol dimers are much more reactive to hydroxyl than monomers and imply that a dimer concentration of about 30% of the equilibrium concentration can account quantitatively for the observed rates. The assumed presence of dimers is supported by the observation of cluster formation in these and other cold beams of molecules subject to hydrogen bonding. The calculations imply an important caveat with respect to the use of cold expansion beams for the study of interstellar chemistry | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Smedarchina, Zorka |e verfasserin |4 aut | |
| 700 | 1 | |a Martínez-Núñez, Emilio |e verfasserin |4 aut | |
| 700 | 1 | |a Fernández-Ramos, Antonio |e verfasserin |4 aut | |
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