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Photoinduced Electron Transfer in a Porphyrin-Fullerene Dyad at a Liquid Interface

Published inThe journal of physical chemistry. B, vol. 126, no. 25, p. 4723-4730
Publication date2022-06-21
First online date2022-06-21
Abstract

The excited-state properties of an amphiphilic porphyrin-fullerene dyad and of its porphyrin analogue adsorbed at the dodecane/water interface are investigated by using surface second-harmonic generation. Although the porphyrin is formally centrosymmetric, the second-harmonic spectra of both compounds are dominated by the intense Soret band of the porphyrin. Polarization-selective measurements and molecular dynamics simulations suggest an angle of about 45° between the donor-acceptor axis and the interfacial plane, with the porphyrin interacting mostly with the nonpolar phase. Time-resolved measurements reveal a marked concentration dependence of the dynamics of both compounds upon Q-band excitation, indicating the occurrence of intermolecular quenching processes. The significant differences in dynamics and spectra between the dyad and the porphyrin analogue are explained by a self-quenching of the excited dyad via an intermolecular electron transfer.

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Citation (ISO format)
SISSAOUI, Jihad et al. Photoinduced Electron Transfer in a Porphyrin-Fullerene Dyad at a Liquid Interface. In: The journal of physical chemistry. B, 2022, vol. 126, n° 25, p. 4723–4730. doi: 10.1021/acs.jpcb.2c02405
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ISSN of the journal1520-5207
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Creation2022/06/30 13:26:00
First validation2022/06/30 13:26:00
Update time2023/03/16 06:54:55
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