Carbon Atom Reactivity with Amorphous Solid Water: H$_2$O Catalyzed Formation of H$_2$CO
| Autor: | Germán Molpeceres, Thanja Lamberts, Gleb Fedoseev, Johannes Kästner, Harold Linnartz, Richard Schömig, D. Qasim |
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| Rok vydání: | 2021 |
| Předmět: |
AMORPHOUS SOLID WATER
Hydrogen AMORPHOUS CARBON chemistry.chemical_element FOS: Physical sciences Photochemistry SOLID-STATE CARBON Catalysis EXPERIMENTAL EVIDENCE chemistry.chemical_compound SIMPLE++ INTERSTELLAR CLOUDS Kinetic isotope effect General Materials Science Reactivity (chemistry) Physical and Theoretical Chemistry CATALYSIS Hydrogen bond CARBON MONOXIDE COMPLEX ORGANICS FORMATION ROUTES HYDROGEN HYDROGEN BONDING NETWORK Astrophysics - Astrophysics of Galaxies Amorphous solid CARBONYLIC COMPOUNDS chemistry Astrophysics of Galaxies (astro-ph.GA) HYDROGEN BONDS Carbon CARBON ATOMS Carbon monoxide |
| Zdroj: | J. Phys. Chem. Lett. Journal of Physical Chemistry Letters Journal of Physical Chemistry Letters, 12(44), 10854-10860. American Chemical Society (ACS) |
| DOI: | 10.48550/arxiv.2110.15887 |
| Popis: | We report new computational and experimental evidence of an efficient and astrochemically relevant formation route to formaldehyde (H$_2$CO). This simplest carbonylic compound is central to the formation of complex organics in cold interstellar clouds, and is generally regarded to be formed by the hydrogenation of solid-state carbon monoxide. We demonstrate H$_2$CO formation via the reaction of carbon atoms with amorphous solid water. Crucial to our proposed mechanism is a concerted proton transfer catalyzed by the water hydrogen bonding network. Consequently, the reactions $^3$C + H$_2$O -> $^3$HCOH and $^1$HCOH -> $^1$H$_2$CO can take place with low or without barriers, contrary to the high-barrier traditional internal hydrogen migration. These low barriers or absence thereof explain the very small kinetic isotope effect in our experiments when comparing the formation of H$_2$CO to D$_2$CO. Our results reconcile the disagreement found in the literature on the reaction route: C + H$_2$O -> H$_2$CO. Accepted for publication in JPCL |
| Databáze: | OpenAIRE |
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