Photoinduced electron and energy transfer in molecular pentads

John Devens Gust, Thomas A Moore, Ana L Moore, Alisdair N. Macpherson, Arnaldo Lopez, Janice M. Degraziano, Isabelle Gouni, Edith Bittersmann, Gilbert R. Seely, Feng Gao, Ronald A. Nieman, Xiaochun C. Ma, Lori J. Demanche, Su Chun Hung, David K. Luttrull, Seung Joo Lee, Pamela K. Kerrigan

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

A series of molecular pentads, each consisting of a porphyrin dyad (P-P) covalently linked to a carotenoid polyene (C) and a diquinone moiety (QA-QB), have been prepared, and the photochemical properties of these molecules have been studied using steady-state and transient absorption and emission spectroscopies. Each of the pentads undergoes photoinduced electron transfer from the C-P-1P-QA-QB singlet state to yield the charge-separated state C-P-P+QA--QB. Competing with charge recombination of this species are additional electron-transfer reactions operating in series and in parallel which converge on a final C+-P-P-QA-QB- state. The electron-transfer rate constants and the quantum yields of the various charge-separated species are sensitive functions of the state energies and the electronic coupling between the porphyrin and diquinone moieties. One of the pentads undergoes photoinduced electron transfer to produce the final C+-P-P-QA-QB- state with a quantum yield of 0.83 and a lifetime of 55 μs. This example of an artificial photosynthetic reaction center preserves about half of the initial excited singlet state energy as chemical potential. Other pentads have charge-separation lifetimes of several hundred microseconds.

Original languageEnglish
Pages (from-to)11141-11152
Number of pages12
JournalJournal of the American Chemical Society
Volume115
Issue number24
Publication statusPublished - 1993

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Energy Transfer
Energy transfer
Electrons
Porphyrins
Quantum yield
Photosynthetic Reaction Center Complex Proteins
Polyenes
Chemical potential
Emission spectroscopy
Carotenoids
Absorption spectroscopy
Excited states
Electron energy levels
Genetic Recombination
Rate constants
Spectrum Analysis
Molecules

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Gust, J. D., Moore, T. A., Moore, A. L., Macpherson, A. N., Lopez, A., Degraziano, J. M., ... Kerrigan, P. K. (1993). Photoinduced electron and energy transfer in molecular pentads. Journal of the American Chemical Society, 115(24), 11141-11152.

Photoinduced electron and energy transfer in molecular pentads. / Gust, John Devens; Moore, Thomas A; Moore, Ana L; Macpherson, Alisdair N.; Lopez, Arnaldo; Degraziano, Janice M.; Gouni, Isabelle; Bittersmann, Edith; Seely, Gilbert R.; Gao, Feng; Nieman, Ronald A.; Ma, Xiaochun C.; Demanche, Lori J.; Hung, Su Chun; Luttrull, David K.; Lee, Seung Joo; Kerrigan, Pamela K.

In: Journal of the American Chemical Society, Vol. 115, No. 24, 1993, p. 11141-11152.

Research output: Contribution to journalArticle

Gust, JD, Moore, TA, Moore, AL, Macpherson, AN, Lopez, A, Degraziano, JM, Gouni, I, Bittersmann, E, Seely, GR, Gao, F, Nieman, RA, Ma, XC, Demanche, LJ, Hung, SC, Luttrull, DK, Lee, SJ & Kerrigan, PK 1993, 'Photoinduced electron and energy transfer in molecular pentads', Journal of the American Chemical Society, vol. 115, no. 24, pp. 11141-11152.
Gust, John Devens ; Moore, Thomas A ; Moore, Ana L ; Macpherson, Alisdair N. ; Lopez, Arnaldo ; Degraziano, Janice M. ; Gouni, Isabelle ; Bittersmann, Edith ; Seely, Gilbert R. ; Gao, Feng ; Nieman, Ronald A. ; Ma, Xiaochun C. ; Demanche, Lori J. ; Hung, Su Chun ; Luttrull, David K. ; Lee, Seung Joo ; Kerrigan, Pamela K. / Photoinduced electron and energy transfer in molecular pentads. In: Journal of the American Chemical Society. 1993 ; Vol. 115, No. 24. pp. 11141-11152.
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AU - Gust, John Devens

AU - Moore, Thomas A

AU - Moore, Ana L

AU - Macpherson, Alisdair N.

AU - Lopez, Arnaldo

AU - Degraziano, Janice M.

AU - Gouni, Isabelle

AU - Bittersmann, Edith

AU - Seely, Gilbert R.

AU - Gao, Feng

AU - Nieman, Ronald A.

AU - Ma, Xiaochun C.

AU - Demanche, Lori J.

AU - Hung, Su Chun

AU - Luttrull, David K.

AU - Lee, Seung Joo

AU - Kerrigan, Pamela K.

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