highlight 2 2023

We are looking at the quenching of an intramolecular charge-separated state produced by photoinduced symmetry-breaking charge separation (SB-CS) in a PDI-based cage synthesized in the Solomek group in Bern. The figure on the right shows the Evolution-Associated Spectra (EAS) resulting from a global analysis of the transient absorption spectra. In the absence of quencher, the S1 state (green) evolves to the 1CS state (orange) with the PDI cation and the anion bands. In the presence of a weak donor quencher, the 1CS state lifetime is only reduced, whereas in the presence of a strong donor, the hole is transferred to the quencher and the electron remains in the PDI (blue). These findings offer promising perspective to extend the lifetime of charge separation towards potential applications in photoelectronic devices.

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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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