We present the synthesis and characterization of a benzodithiophene/thiophene alternating copolymer decorated with rigid, singly branched pendant side chains. We characterize exciton migration and recombination dynamics in these molecules in tetrahydrofuran solution, using a combination of static and time-resolved spectroscopies. As control experiments, we also measure electronic relaxation dynamics in isolated molecular analogues of both the side chain and polymer moieties. We employ semi-empirical and time-dependent density functional theory calculations to show that photoexcitation of the decorated copolymer using 395 nm laser pulses results in excited states primarily localized on the pendant side chains. We use ultrafast transient absorption spectroscopy to show that excitations are transferred to the polymer backbone faster than the instrumental response function, ∼250 fs.
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21 January 2014
Research Article|
January 21 2014
Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymer
Graham B. Griffin;
Graham B. Griffin
a)
1Department of Chemistry,
The James Franck Institute
, Institute for Biophysical Dynamics, The University of Chicago
, Chicago, Illinois 60637, USA
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Pamela M. Lundin;
Pamela M. Lundin
a)
2Department of Chemical Engineering,
Stanford University
, Stauffer III, 381 North-South Mall, Stanford, California 94305, USA
3A. R. Smith Department of Chemistry,
Appalachian State University
, 417 CAP Building, 525 Rivers Street, Boone, North Carolina 28608, USA
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Brian S. Rolczynski;
Brian S. Rolczynski
1Department of Chemistry,
The James Franck Institute
, Institute for Biophysical Dynamics, The University of Chicago
, Chicago, Illinois 60637, USA
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Alexander Linkin;
Alexander Linkin
1Department of Chemistry,
The James Franck Institute
, Institute for Biophysical Dynamics, The University of Chicago
, Chicago, Illinois 60637, USA
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Ryan D. McGillicuddy;
Ryan D. McGillicuddy
1Department of Chemistry,
The James Franck Institute
, Institute for Biophysical Dynamics, The University of Chicago
, Chicago, Illinois 60637, USA
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Zhenan Bao;
Zhenan Bao
2Department of Chemical Engineering,
Stanford University
, Stauffer III, 381 North-South Mall, Stanford, California 94305, USA
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Gregory S. Engel
Gregory S. Engel
b)
1Department of Chemistry,
The James Franck Institute
, Institute for Biophysical Dynamics, The University of Chicago
, Chicago, Illinois 60637, USA
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a)
G. B. Griffin and P. M. Lundin contributed equally to this work.
b)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Chem. Phys. 140, 034903 (2014)
Article history
Received:
September 29 2013
Accepted:
December 09 2013
Citation
Graham B. Griffin, Pamela M. Lundin, Brian S. Rolczynski, Alexander Linkin, Ryan D. McGillicuddy, Zhenan Bao, Gregory S. Engel; Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymer. J. Chem. Phys. 21 January 2014; 140 (3): 034903. https://doi.org/10.1063/1.4855156
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