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Twisting the light away: Internal conversion between the S2 and S1 excited singlet states is rapid in the target dyes (see picture) but shows a clear sensitivity to rotational flexibility of the meso‐phenyl ring. Steric crowding by methyl groups at the 4,7‐positions leads to a curved S2 potential‐energy surface punctured with nonlocal pinholes coupled to the S1 surface. Removal of these groups flattens...
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