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Issue 4, 2019
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Dissociative photodetachment vs. photodissociation of aromatic carboxylates: the benzoate and naphthoate anions

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Abstract

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.

Graphical abstract: Dissociative photodetachment vs. photodissociation of aromatic carboxylates: the benzoate and naphthoate anions

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Publication details

The article was received on 20 Nov 2018, accepted on 25 Dec 2018 and first published on 26 Dec 2018


Article type: Paper
DOI: 10.1039/C8CP07162D
Phys. Chem. Chem. Phys., 2019,21, 1797-1804

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    Dissociative photodetachment vs. photodissociation of aromatic carboxylates: the benzoate and naphthoate anions

    G. A. Pino, R. A. Jara-Toro, J. P. Aranguren-Abrate, C. Dedonder-Lardeux and C. Jouvet, Phys. Chem. Chem. Phys., 2019, 21, 1797
    DOI: 10.1039/C8CP07162D

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