Gas-Phase Reactions of Deprotonated Nucleobases with H, N, and O Atoms
| Autor: | W. Carl Lineberger, Charles M. Nichols, Veronica M. Bierbaum, Zhe-Chen Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
Hydrogen Guanine chemistry.chemical_element Uracil 02 engineering and technology Hydrogen atom 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Nucleobase Thymine Ion Reaction rate chemistry.chemical_compound chemistry General Materials Science Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry Letters. 10:4863-4867 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.9b01997 |
| Popis: | Complex organic molecules, the hallmark of terrestrial life, are increasingly detected in exotic environments throughout the universe. Our studies probe the ion chemistry of these biomolecules. We report gas-phase reaction rate constants for five deprotonated nucleobases (adenine, cytosine, guanine, thymine, and uracil) reacting with the atomic species H, N, and O. Hydrogen atoms react at moderate rates via associative electron detachment. Oxygen atom reactions occur more rapidly, generating complex product distributions; reaction pathways include associative electron detachment, substitution of the hydrogen atom by an oxygen atom, and generation of OCN–. Nitrogen atoms do not react with the nucleobase anions. The reaction thermodynamics were investigated computationally, and reported product channels are exothermic. Many of the proposed products have been observed in various astrochemical environments. These reactions provide insight into chemical processes that may occur at the boundaries between diffus... |
| Databáze: | OpenAIRE |
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