Dissociative photodetachment vs. photodissociation of aromatic carboxylates: the benzoate and naphthoate anions
| Autor: | Gustavo A. Pino, Juan P Aranguren-Abrate, Christophe Jouvet, Rafael A. Jara-Toro, Claude Dedonder-Lardeux |
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| Přispěvatelé: | Instituto de Investigaciones en Físico Química [Córdoba] (INFIQC), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Facultad de Ciencias Químicas [Córdoba], Universidad Nacional de Córdoba [Argentina]-Universidad Nacional de Córdoba [Argentina], Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), ANR-10-BLAN-0405,ESPM,Etats excités des molécules protonées(2010) |
| Rok vydání: | 2019 |
| Předmět: |
Chemistry
Radical [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus] Photodissociation General Physics and Astronomy Ionic bonding 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Kinetic energy 01 natural sciences Bond-dissociation energy Dissociation (chemistry) 0104 chemical sciences Ion Excited state Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Physical Chemistry Chemical Physics Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2019, 21 (4), pp.1797-1804. ⟨10.1039/c8cp07162d⟩ Physical Chemistry Chemical Physics, 2019, 21 (4), pp.1797-1804. ⟨10.1039/c8cp07162d⟩ |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c8cp07162d⟩ |
| Popis: | International audience; The competition between dissociative photodetachment and photodissociation of cold benzoate and naphthoate anions was studied through measurement of the kinetic energy of the neutral fragments and intact parent benzoyloxy and naphtoyloxy radicals as well as by detecting the anionic fragments whenever they are produced. For the benzoate anion, there is no ionic photodissociation and the radical dissociation occurs near the vertical photodetachment energy. This is in agreement with DFT calculations showing that the dissociation energy in CO2 and C6H5˙ is very low. The dissociation barrier can be deduced from experimental results and calculations to be (0.7 ± 0.1) eV, which makes the benzoyloxyradical C6H5COO˙ very unstable, although more stable than the acetyloxy radical. In the case of naphthoate, the observation of negative fragments at low excitation energies demonstrates the opening of the ionic photodissociation channel in the excited state of the naphthoate anion, whose yield decreases at higher energies when the dissociative photodetachment channel opens. |
| Databáze: | OpenAIRE |
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