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Broadband fluorescence upconversion spectroscopy was used to monitor the instantaneous emission transition dipole moment (μem) of centrosymmetric acceptor-donor-acceptor (ADA) type molecules. The Figure presents the transient emission spectra measured in a quadrupolar solvent, and the resulting μem are shown in the inset. The results highlight the importance of the interactions through the quadrupole moment of the solute. If the quadrupole moment increases significantly upon excitation, the reorganization of the surrounding solvent molecules can lead to symmetry breaking. By contrast, in the case of a minor increase, the electronic structure remains symmetric.

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Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
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