Central Ring Puckering Enhances the Stokes Shift of Xanthene Dyes
David Dunlop,
Peter Horváth,
Petr Klán
et al.
Abstract:Small‐molecule dyes are generally designed based on well‐understood electronic effects. However, steric hindrance can promote excited‐state geometric relaxation, increasing the difference between the positions of absorption and emission bands (the Stokes shift). Accordingly, we hypothesized that sterically induced central ring puckering in xanthene dyes could be used to systematically increase their Stokes shift. Through a combined experimental/quantum‐chemical approach, we screened a group of (9‐acylimino)‐py… Show more
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