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Scientific article
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Excited-state symmetry breaking in solvent mixtures

Published inThe journal of physical chemistry letters, vol. 15, no. 9, p. 2447-2452
Publication date2024-02-26
First online date2024-02-26
Abstract

A large number of multipolar dyes undergo excited-state symmetry breaking (ESSB) in polar media. During this process, electronic excitation, initially distributed evenly over the molecule, localizes, at least partially, on one donor–acceptor branch. To resolve its initial stage, ESSB is investigated with a donor–acceptor–donor dye in binary mixtures of nonpolar and polar solvents using time-resolved infrared absorption spectroscopy. The presence of a few polar molecules around the dye is sufficient to initiate ESSB. Although the extent of asymmetry in a mixture is close to that in a pure solvent of similar polarity, the dynamics are slower and involve translational diffusion. However, preferential solvation in the mixtures leads to a larger local polarity. Furthermore, inhomogeneous broadening of the S1 ← S0 absorption band of the dye is observed in the mixtures, allowing for a photoselection of solutes with different local environments and ESSB dynamics.

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Citation (ISO format)
BALANIKAS, Vangelis, REYMOND-JOUBIN, Maric, VAUTHEY, Eric. Excited-state symmetry breaking in solvent mixtures. In: The journal of physical chemistry letters, 2024, vol. 15, n° 9, p. 2447–2452. doi: 10.1021/acs.jpclett.4c00213
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Article (Accepted version)
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ISSN of the journal1948-7185
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