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Modulation of circularly polarized luminescence through excited-state symmetry breaking and interbranched exciton coupling in helical push-pull organic systems

Abstract : pi-Helical push-pull dyes were prepared and their (chir)optical properties were investigated both experimentally and computationally. Specific fluorescent behaviour of bis-substituted system was observed with unprecedented solvent effect on the intensity of circularly polarized luminescence (CPL, dissymmetry factor decreasing from 10(-2) to 10(-3) with an increase in solvent polarity) that was linked to a change in symmetry of chiral excited state and suppression of interbranched exciton coupling. The results highlight the potential of CPL spectroscopy to study and provide a deeper understanding of electronic photophysical processes in chiral pi-conjugated molecules.
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Submitted on : Friday, February 7, 2020 - 9:40:01 AM
Last modification on : Tuesday, September 1, 2020 - 3:09:40 AM

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Kais Dhbaibi, Ludovic Favereau, Monika Srebro-Hooper, Cassandre Quinton, Nicolas Vanthuyne, et al.. Modulation of circularly polarized luminescence through excited-state symmetry breaking and interbranched exciton coupling in helical push-pull organic systems. Chemical Science , The Royal Society of Chemistry, 2020, 11 (2), pp.567-576. ⟨10.1039/c9sc05231c⟩. ⟨hal-02470140⟩

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