Photoinduced electron-transfer processes along molecular wires based on phenylenevinylene oligomers

A quantum-chemical insight

G. Pourtois, D. Beljonne, J. Cornil, Mark A Ratner, J. L. Brédas

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Quantum-chemical techniques are applied to model the mechanisms of photoinduced charge transfer from a π-electron donating group (tetracene, D) to a π-electron-acceptor moiety (pyromellitimide, A) separated by a bridge of increasing size (p-phenylenevinylene oligomers, B). Correlated Hartree-Fock semiempirical approaches are exploited to calculate the four main parameters controlling the transfer rate (kRP) in the framework of Marcus-Jortner-Levich's formalism: (i) the electronic coupling between the initial and final states; (ii) and (iii) the internal and external reorganization energy terms; and (iv) the variation of the free Gibbs energy. The charge transfer is shown to proceed in these compounds through two competing mechanisms, coherent (superexchange) versus incoherent (bridge-mediated) pathways. While superexchange is the dominant mechanism for short bridges, incoherent transfer through hopping along the phenylene vinylene segment takes over in longer chains (for ca. three phenylenevinylene repeat units). The influence of the chemical structure of the π-conjugated phenylenevinylene bridge on the electronic properties and the rate of charge transfer is also investigated.

Original languageEnglish
Pages (from-to)4436-4447
Number of pages12
JournalJournal of the American Chemical Society
Volume124
Issue number16
DOIs
Publication statusPublished - Apr 24 2002

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Oligomers
Wire
Electrons
Charge transfer
Gibbs free energy
Electronic properties
naphthacene

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Photoinduced electron-transfer processes along molecular wires based on phenylenevinylene oligomers : A quantum-chemical insight. / Pourtois, G.; Beljonne, D.; Cornil, J.; Ratner, Mark A; Brédas, J. L.

In: Journal of the American Chemical Society, Vol. 124, No. 16, 24.04.2002, p. 4436-4447.

Research output: Contribution to journalArticle

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