highlight 11 2017

We are currently investigating a series of quadrupolar D-𝜋-A-𝜋-D compounds with the same electron donor unit, D, but different electron accepting cores A. Upon optical excitation, these molecules undergo Excited-State Symmetry Breaking (ESSB) in polar solvents, i.e. the initially quadrupolar state evolves to a dipolar state.
To study this, we apply time-resolved infrared spectroscopy to monitor the ethynyl stretching modes located in the
𝜋 bridges. The figure shows how this vibrational modes change considerably with time in a polar solvent, where ESSB is taking place, but not in an apolar one. Current work aims to gain better insight into ESSB, in particular how donor/acceptor strength and conformational changes affect these dynamics.
 

 

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Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)


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