Wavelength dependent mechanism of phenolate photooxidation in aqueous solution

Авторы: Kate Robertson, Fortune William G., Davies Julia A., Boichenko Anton N., Scholz Michael S., Tau Omri, Bochenkova Anastasia V., Fielding Helen H.
Журнал: Chemical science
Год издания: 2023
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/D3SC00016H
Аннотация: Phenolate photooxidation is integral to a range of biological processes, yet the mechanism of electron ejection has been disputed. Here, we combine femtosecond transient absorption spectroscopy, liquidmicrojet photoelectron spectroscopy and high-level quantum chemistry calculations to investigate the photooxidation dynamics of aqueous phenolate following excitation at a range of wavelengths, from the onset of the S0–S1 absorption band to the peak of the S0–S2 band. We find that for λ ≥ 266 nm, electron ejection occurs from the S1 state into the continuum associated with the contact pair in which the PhO radical is in its ground electronic state. In contrast, we find that for λ ≤ 257 nm, electron ejection also occurs into continua associated with contact pairs containing electronically excited PhO radicals and that these contact pairs have faster recombination times than those containing PhO radicals in their ground electronic state.
Добавил в систему: Боченкова Анастасия Владимировна

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