Bioinspired energy conversion

Rodrigo E. Palacios, Stephanie L. Gould, Christian Herrero, Michael Hambourger, Alicia Brune, Gerdenis Kodis, Paul A. Liddell, John Kennis, Alisdair N. Macpherson, Devens Gust, Thomas A. Moore, Ana L. Moore

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Artificial photosynthetic antenna systems have been synthesized based on carotenoid polyenes and polymer-polyenes covalently attached to tetrapyrroles. Absorption of light in the blue/green region of the spectra excites the polyenes to their S2 state, and ultra-fast singlet energy transfer to the tetrapyrroles occurs when the chromophores are in partial conjugation. The additional participation of other excited states of the polyene in the energy-transfer process is a requirement for perfect antenna function. Analogs of photosynthetic reaction centers consisting of tetrapyrrole chromophores covalently linked to electron acceptors and donors have been prepared. Excitation of these constructs results in a cascade of energy transfer/electron transfer which, in selected cases, forms a final charge-separated state characterized by a giant dipole moment (>150 D), a quantum yield approaching unity, a significant fraction of the photon energy stored as chemical potential, and a lifetime sufficient for reaction with secondary electron donors and acceptors. A new antenna-reaction center complex is described in which a carotenoid moiety is located in partial conjugation with the tetrapyrrole π-system allowing fast energy transfer (<100 fs) between the chromophores. In this assembly, the energy transduction process can be initiated by light absorbed by the polyene.

Original languageEnglish
Pages (from-to)1001-1008
Number of pages8
JournalPure and Applied Chemistry
Volume77
Issue number6
DOIs
Publication statusPublished - Jun 2005

Keywords

  • Antenna systems
  • Bioinspired
  • Carotenoid polyenes
  • Energy conversion
  • Photosynthesis

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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