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- Title
On the role of excitonic interactions in carotenoid-phthalocyanine dyads and implications for photosynthetic regulation.
- Authors
Liao, Pen-Nan; Pillai, Smitha; Kloz, Miroslav; Gust, Devens; Moore, Ana; Moore, Thomas; Kennis, John; Grondelle, Rienk; Walla, Peter
- Abstract
In two recent studies, energy transfer was reported in certain phthalocyanine-carotenoid dyads between the optically forbidden first excited state of carotenoids (Car S) and phthalocyanines (Pcs) in the direction Pc → Car S (Kloz et al., J Am Chem Soc 133:7007-7015, ) as well as in the direction Car S → Pc (Liao et al., J Phys Chem A 115:4082-4091, ). In this article, we show that the extent of this energy transfer in both directions is closely correlated in these dyads. This correlation and the additional observation that Car S is instantaneously populated after Pc excitation provides evidence that in these compounds excitonic interactions can occur. Besides pure energy transfer and electron transfer, this is the third type of tetrapyrrole-carotenoid interaction that has been shown to occur in these model compounds and that has previously been proposed as a photosynthetic regulation mechanism. We discuss the implications of these models for photosynthetic regulation. The findings are also discussed in the context of a model in which both electronic states are disordered and in which the strength of the electronic coupling determines whether energy transfer, excitonic coupling, or electron transfer occurs.
- Subjects
CAROTENOIDS; CHLOROPHYLL; CHARGE transfer; PHTHALOCYANINES; PHOTOSYNTHESIS; TETRAPYRROLES
- Publication
Photosynthesis Research, 2012, Vol 111, Issue 1/2, p237
- ISSN
0166-8595
- Publication type
Article
- DOI
10.1007/s11120-011-9690-9