Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad

Paul A. Liddell, Darius Kuciauskas, John P. Sumida, Boaz Nash, Dorothy Nguyen, Ana L Moore, Thomas A Moore, John Devens Gust

Research output: Contribution to journalArticle

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Abstract

A molecular triad consisting of a diarylporphyrin (P) covalently linked to a carotenoid polyene (C) and a fullerene (C60) has been prepared and studied using time-resolved spectroscopic methods. In 2-methyltetrahydrofuran solution, the triad undergoes photoinduced electron transfer to yield C-P·+-C60·-, which evolves into C·+-P-C60·- with an overall quantum yield of 0.14. This state decays by charge recombination to yield the carotenoid triplet state with a time constant of 170 ns. Even in a glass at 77 K, C·+-P-C60·- is formed with a quantum yield of ~0.10 and again decays mainly by charge recombination to give 3C-P-C60. The fullerene triplet, formed through normal intersystem crossing, is also observed at 77 K. The generation in the triad of a long-lived charge separated state by photoinduced electron transfer, the low-temperature electron transfer behavior, and the formation of a triplet state by charge recombination are phenomena previously observed mostly in photosynthetic reaction centers.

Original languageEnglish
Pages (from-to)1400-1405
Number of pages6
JournalJournal of the American Chemical Society
Volume119
Issue number6
DOIs
Publication statusPublished - Feb 12 1997

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Fullerenes
Porphyrins
Quantum yield
Carotenoids
Genetic Recombination
Electrons
Photosynthetic Reaction Center Complex Proteins
Polyenes
Electron temperature
Glass
Temperature
fullerene C60
2-methyltetrahydrofuran

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad. / Liddell, Paul A.; Kuciauskas, Darius; Sumida, John P.; Nash, Boaz; Nguyen, Dorothy; Moore, Ana L; Moore, Thomas A; Gust, John Devens.

In: Journal of the American Chemical Society, Vol. 119, No. 6, 12.02.1997, p. 1400-1405.

Research output: Contribution to journalArticle

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AU - Nguyen, Dorothy

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AU - Moore, Thomas A

AU - Gust, John Devens

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