Dynamics of photoinduced electron transfer in an amphiphilic A2+-S-D triad molecule

Masaru Sakomura, Su Lin, Thomas A Moore, Ana L Moore, John Devens Gust, Masamichi Fujihira

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

An amphiphilic A2+-S-D triad molecule and its reference compounds, S-D, A2+-S, and S type molecules, were synthesized and studied using time-resolved transient absorption spectroscopy. The three moieties in the triad, i.e., an electron acceptor moiety (A2+, viologen), a sensitizer moiety (S, perylene), and an electron donor moiety (D, ferrocene), were linearly combined by sigma-bonded tunneling bridges. Intramolecular electron transfer reactions were initiated by photoexcitation of the S moiety to 1S*, and the long-lived final charge separated state, A.+-S-D.+, was formed. Although the yield of the initial charge separated state, A.+-S.+-D, was very high (0.93), the overall yield of the final charge separated state was ca. 0.2. The rate of the backward electron transfer from A.+ to S.+ was observed to be two times lower than that of the forward electron transfer from 1S* to A2+, suggesting that with suitable molecular engineering, the yield of long-lived charge separation in such triads could be improved.

Original languageEnglish
Pages (from-to)2218-2226
Number of pages9
JournalJournal of Physical Chemistry A
Volume106
Issue number10
DOIs
Publication statusPublished - Mar 14 2002

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electron transfer
Molecules
Electrons
molecules
polarization (charge separation)
photoexcitation
Viologens
Perylene
absorption spectroscopy
electrons
engineering
Photoexcitation
Absorption spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Dynamics of photoinduced electron transfer in an amphiphilic A2+-S-D triad molecule. / Sakomura, Masaru; Lin, Su; Moore, Thomas A; Moore, Ana L; Gust, John Devens; Fujihira, Masamichi.

In: Journal of Physical Chemistry A, Vol. 106, No. 10, 14.03.2002, p. 2218-2226.

Research output: Contribution to journalArticle

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