Evidence for a through-space pathway for electron transfer from quantum dots to carboxylate-functionalized viologens

Adam J. Morris-Cohen, Mark D. Peterson, Matthew T. Frederick, Judith M. Kamm, Emily A. Weiss

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Ultrafast transient absorption measurements reveal that the rate constant for photoinduced electron transfer (PET) from colloidal CdS quantum dots (QDs) to alkylcarboxylate-functionalized viologens is independent of the number of methylene groups in the alkyl chain (n). The rate constant for PET is (1.2 ± 0.3) × 10 10 s -1 for n = 1, 2, and 3, and for n = 0 (methylviologen). The insensitivity of the electron transfer rate constant to the length of the functional groups on the viologen suggests that a "through-space" pathway, where the electron bypasses the alkylcarboxylate and tunnels instead through only the orbitals of the QD and of the bipyridinium core, is the dominant PET pathway.

Original languageEnglish
Pages (from-to)2840-2844
Number of pages5
JournalJournal of Physical Chemistry Letters
Issue number19
Publication statusPublished - Oct 4 2012


ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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