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Article Dans Une Revue Chemical Physics Letters Année : 2016

Excited-state symmetry breaking of linear quadrupolar chromophores: A transient absorption study

Résumé

The photophysical properties of two highly symmetrical quadrupolar chromophores were studied by both steady-state and transient absorption spectroscopy. Their excited-state behavior is dominated by the solvent-induced Stokes shift of the stimulated-emission band. The origin of this shift is attributed to symmetry breaking that confers a non-vanishing dipole moment to the excited state of both compounds. This dipole moment is large and constant in DMSO, whereas symmetry breaking appears significantly slower and leading to smaller excited-state dipole in toluene. Time-dependant increase of the excited-state dipole moment induced by weak solvation is proposed to explain the results in toluene.

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Chimie
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Dates et versions

hal-01382724 , version 1 (17-10-2016)

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Nadia Dozova, Lionel Ventelon, Guillaume Clermont, Mireille Blanchard-Desce, Pascal Plaza. Excited-state symmetry breaking of linear quadrupolar chromophores: A transient absorption study. Chemical Physics Letters, 2016, 664, pp.56 - 62. ⟨10.1016/j.cplett.2016.10.020⟩. ⟨hal-01382724⟩
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