According to the Kasha-Vavilov rule, photochemistry does not depend on the excitation wavelength. We investigated a alkynylated push-pull dye synthesised in the Matile group, which is characterised by a large structural disorder at room temperature. We found that planar molecules have intense S1 ← S0 absorption, whereas twisted ones have rather strong S3 ← S0 absorption. This allows for a selective excitation of dyes with different geometries. In a rigid environment where this disorder is frozen, we observed markedly different excited-state dynamics depending on the excitation wavelength as illustrated in the above figure. More details can be found in our just published article (https://doi.org/10.1021/acs.jpclett.4c01840).
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Eric Vauthey
Physical Chemistry Department - Sciences II - University of Geneva
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