On the role of excitonic interactions in carotenoid-phthalocyanine dyads and implications for photosynthetic regulation

Pen Nan Liao, Smitha Pillai, Miroslav Kloz, John Devens Gust, Ana L Moore, Thomas A Moore, John T M Kennis, Rienk Van Grondelle, Peter J. Walla

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In two recent studies, energy transfer was reported in certain phthalocyanine-carotenoid dyads between the optically forbidden first excited state of carotenoids (Car S1) and phthalocyanines (Pcs) in the direction Pc → Car S1 (Kloz et al., J Am Chem Soc 133:7007-7015, 2011) as well as in the direction Car S1 → Pc (Liao et al., J Phys Chem A 115:4082-4091, 2011). 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 S1 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.

Original languageEnglish
Pages (from-to)237-243
Number of pages7
JournalPhotosynthesis Research
Volume111
Issue number1-2
DOIs
Publication statusPublished - Mar 2012

Fingerprint

Energy Transfer
Carotenoids
energy transfer
Energy transfer
carotenoids
Railroad cars
electron transfer
electronics
Tetrapyrroles
Electrons
Electronic states
Excited states
phthalocyanine
Direction compound

Keywords

  • Carotenoid-phthalocyanine dyads
  • Carotenoids
  • Chlorophylls
  • Excitonic interactions
  • Two-photon excitation

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology
  • Biochemistry

Cite this

On the role of excitonic interactions in carotenoid-phthalocyanine dyads and implications for photosynthetic regulation. / Liao, Pen Nan; Pillai, Smitha; Kloz, Miroslav; Gust, John Devens; Moore, Ana L; Moore, Thomas A; Kennis, John T M; Van Grondelle, Rienk; Walla, Peter J.

In: Photosynthesis Research, Vol. 111, No. 1-2, 03.2012, p. 237-243.

Research output: Contribution to journalArticle

Liao, Pen Nan ; Pillai, Smitha ; Kloz, Miroslav ; Gust, John Devens ; Moore, Ana L ; Moore, Thomas A ; Kennis, John T M ; Van Grondelle, Rienk ; Walla, Peter J. / On the role of excitonic interactions in carotenoid-phthalocyanine dyads and implications for photosynthetic regulation. In: Photosynthesis Research. 2012 ; Vol. 111, No. 1-2. pp. 237-243.
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