Conformation of the Ester Group Governs the Photophysics of Highly Polarized Benzo[g]coumarins.

ABSTRACT: Photosensitizers that display "unusual" emission from upper electronically excited states offer possibilities for initiating higher-energy processes than what the governing Kasha's rule postulates. Achieving conditions for dual fluorescence from multiple states of the same species requires molecular design and conditions that favorably tune the excited-state dynamics. Herein, we switch the position of the electron-donating NMe₂ group around the core of benzo[g]coumarins (BgCoum) and tune the electronic coupling and the charge-transfer character of the fluorescent excited states. For solvents with intermediate polarity, three of the four regioisomers exhibit fluorescence from two different excited states with bands that are well separated in the visible and the near-infrar

SUBMITTER: Szychta K 

PROVIDER: S-EPMC10369411 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature