Applying an Anti-Kasha Model Resolves Differences Between Photosynthetic and Artificial Pigments.

ABSTRACT: The current interpretation of excitation energy transfer (EET) processes in natural photosynthesis generally relies on Kasha's rule, suggesting that internal conversion (IC) processes usually outpace any EET between higher excited states. It is, however, known from research on artificial systems that Kasha's rule does not apply to many dyes, especially when found in assembled clusters analogous to photosynthetic chlorophyll (Chl)-protein complexes. In this contribution, a semiempirical Förster-type model is applied to otherwise well-investigated pigments of natural photosynthesis (Chls a, b, c1 and various carotenoids). Strong potential for anti-Kasha processes is identified in all investigated pigments, based on their high Coulomb coupling elements, similar to compoun

SUBMITTER: Gotze JP 

PROVIDER: S-EPMC12337091 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature