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Updated: Mar 19, 2026

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
Published on: December 16, 2019
Fluorescence Quenching of Benzaldehyde in Water by Hydrogen Atom Abstraction
Katharyn Fletcher1, Uwe H F Bunz2, Andreas Dreuw3
1Interdisziplinäres Zentrum für Wissenschaftliches Rechnen, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 368, 69120, Heidelberg, Germany.
Abstract:
We computed the mechanism of fluorescence quenching of benzaldehyde in water through relaxed potential energy surface scans. Time-dependent density functional theory calculations along the protonation coordinate from water to benzaldehyde reveal that photoexcitation to the bright ππ* (S3 ) state is immediately followed by ultrafast decay to the nπ* (S1 ) state. Evolving along this state, benzaldehyde (BA) abstracts a hydrogen atom, resulting in a BAH(.) and OH(.) radical pair. Benzaldehyde does not act as photobase in water, but abstracts a hydrogen atom from a nearby solvent molecule. The system finally decays back to the ground state by non-radiative decay and an electron transfers back to the OH(.) radical. Proton transfer from BAH(+) to OH(-) restores the initial situation, BA in water.
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