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 Allyn Weiss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

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 (US)
Pages (from-to)2840-2844
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number19
DOIs
StatePublished - Oct 4 2012

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Evidence for a through-space pathway for electron transfer from quantum dots to carboxylate-functionalized viologens'. Together they form a unique fingerprint.

Cite this