We are investigating the excited-state dynamics of conjugated multi-donor-acceptor (D-A) push-pull systems, with an increasing number of -C≡C- units (one, two, and four) in collaboration with the group of B. Carlotti in Perugia, using time-resolved IR spectroscopy. In non-polar solvents, a single -C≡C- band is observed with all three systems, pointing to a symmetric distribution of the excitation in 3. Significant spectral dynamics are present in polar solvents. They are due to solvent relaxation and the localisation of the excited electron on the A subunit in 1 and 2 as well as to a localization of the hole on a single branch in 3, hence to excited-state symmetry breaking.
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Contact:
Eric Vauthey
Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)
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