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

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
compounds with already known anti-Kasha properties. The pigments are
further found to form strongly delocalized excitons, especially between
the higher excited states usually responsible for anti-Kasha pathways.
Test calculations with different pigment compositions for various
natural light harvesting complexes (LHCII, CP24, CP26, CP29, FCP)
demonstrate how the higher band EET network and absorbance could be
affected by the presence of accessory pigments: Chl a-only networks should perform anti-Kasha EET, but this is suppressed
by the presence of accessory pigments via several mechanisms (exciton
disruption, spectral competition, energy sinks and fast, non-Chl a IC). The apparent “special” behavior of
photosynthetic systems is thus resolved as the result of pigment mixtures.