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Excitation-Wavelength-Dependent Photophysics of a Torsionally Disordered Push–Pull Dye

Published inThe journal of physical chemistry letters, vol. 15, p. 7857-7862
Publication date2024-07-25
First online date2024-07-25
Abstract

The torsional disorder of conjugated dyes in the electronic ground state can lead to inhomogeneous broadening of the S1 ←S0 absorption band, allowing for the selective photoexcitation of molecules with different amounts of distortion. Here, we investigate how this affects electronic transitions to upper excited states. We show that torsion of a core-alkynylated push–pull dye can have opposite effects on the oscillator strength of its lowest-energy transitions. Consequently, photoselection of planar and twisted molecules can be achieved by exciting in distinct absorption bands. Whereas this has limited effect in liquids due to fast planarization of the excited molecules, it strongly affects the overall photophysics in a polymeric environment, where torsional motion is hindered, allowing for the photoselection of molecules with different fluorescence quantum yields and intersystem-crossing dynamics.

Citation (ISO format)
FURERAJ, Ina et al. Excitation-Wavelength-Dependent Photophysics of a Torsionally Disordered Push–Pull Dye. In: The journal of physical chemistry letters, 2024, vol. 15, p. 7857–7862. doi: 10.1021/acs.jpclett.4c01840
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Additional URL for this publicationhttps://pubs.acs.org/doi/10.1021/acs.jpclett.4c01840
Journal ISSN1948-7185
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