Photoinduced Electron Transfer in Carotenoporphyrin-Fullerene Triads: Temperature and Solvent Effects

Darius Kuciauskas, Paul A. Liddell, Su Lin, Simon G. Stone, Ana L Moore, Thomas A Moore, John Devens Gust

Research output: Contribution to journalArticle

148 Citations (Scopus)

Abstract

A carotenoid (C) porphyrin (P) fullerene (C60) molecular triad (C-P-C60) has been synthesized and found to undergo photoinduced electron transfer from the porphyrin first excited singlet state or to the fullerene first excited singlet state to yield C-P•+-C60 •-. Electron transfer from the carotenoid then gives a C•+-P-C60 •- final charge-separated state. This state is formed with quantum yields up to 0.88 and has a lifetime of up to 1 μs, depending upon the conditions. The various electron transfer rate constants are relatively insensitive to solvent and temperature. The quantum yield of C•+-P-C60 •- is relatively constant under conditions ranging from fluid solutions at ambient temperatures to a rigid organic glass at 8 K. In most solvents, recombination of C•+-P-C60 •- yields the carotenoid triplet state, rather than the ground state. The results suggest that the energies of the charge-separated states of fullerene-based systems are only about half as sensitive to changes in solvent dielectric constant as are those for similar molecules with quinone electron acceptors, and that total reorganization energies for electron transfer are also smaller.

Original languageEnglish
Pages (from-to)4307-4321
Number of pages15
JournalJournal of Physical Chemistry B
Volume104
Issue number18
Publication statusPublished - May 11 2000

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Fullerenes
carotenoids
fullerenes
temperature effects
electron transfer
Carotenoids
Electrons
porphyrins
Porphyrins
Quantum yield
Excited states
Temperature
quinones
atomic energy levels
ambient temperature
excitation
Ground state
permittivity
Rate constants
Permittivity

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Photoinduced Electron Transfer in Carotenoporphyrin-Fullerene Triads : Temperature and Solvent Effects. / Kuciauskas, Darius; Liddell, Paul A.; Lin, Su; Stone, Simon G.; Moore, Ana L; Moore, Thomas A; Gust, John Devens.

In: Journal of Physical Chemistry B, Vol. 104, No. 18, 11.05.2000, p. 4307-4321.

Research output: Contribution to journalArticle

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