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

Research output: Contribution to journalArticle

28 Citations (Scopus)

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

Fingerprint

Viologens
carboxylates
Semiconductor quantum dots
electron transfer
quantum dots
Electrons
Rate constants
bypasses
methylene
tunnels
Functional groups
Tunnels
orbitals
sensitivity
electrons

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Evidence for a through-space pathway for electron transfer from quantum dots to carboxylate-functionalized viologens. / Morris-Cohen, Adam J.; Peterson, Mark D.; Frederick, Matthew T.; Kamm, Judith M.; Weiss, Emily A.

In: Journal of Physical Chemistry Letters, Vol. 3, No. 19, 04.10.2012, p. 2840-2844.

Research output: Contribution to journalArticle

Morris-Cohen, Adam J. ; Peterson, Mark D. ; Frederick, Matthew T. ; Kamm, Judith M. ; Weiss, Emily A. / Evidence for a through-space pathway for electron transfer from quantum dots to carboxylate-functionalized viologens. In: Journal of Physical Chemistry Letters. 2012 ; Vol. 3, No. 19. pp. 2840-2844.
@article{6e28de67dc664ec4a012b5220b320916,
title = "Evidence for a through-space pathway for electron transfer from quantum dots to carboxylate-functionalized viologens",
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.",
author = "Morris-Cohen, {Adam J.} and Peterson, {Mark D.} and Frederick, {Matthew T.} and Kamm, {Judith M.} and Weiss, {Emily A}",
year = "2012",
month = "10",
day = "4",
doi = "10.1021/jz301318m",
language = "English",
volume = "3",
pages = "2840--2844",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "19",

}

TY - JOUR

T1 - Evidence for a through-space pathway for electron transfer from quantum dots to carboxylate-functionalized viologens

AU - Morris-Cohen, Adam J.

AU - Peterson, Mark D.

AU - Frederick, Matthew T.

AU - Kamm, Judith M.

AU - Weiss, Emily A

PY - 2012/10/4

Y1 - 2012/10/4

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84867161116&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84867161116&partnerID=8YFLogxK

U2 - 10.1021/jz301318m

DO - 10.1021/jz301318m

M3 - Article

VL - 3

SP - 2840

EP - 2844

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 19

ER -