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Title: Photoinitiated Charge Transport through π-Stacked Electron Conduits in Supramolecular Ordered Assemblies of Donor−Acceptor Triads

Abstract

Photochemical electron donor-acceptor triads having an aminopyrene primary donor (APy) and a p-diaminobenzene secondary donor (DAB) attached to either one or both imide nitrogen atoms of a perylene-3,4:9,10-bis(dicarboximide) (PDI) electron acceptor were prepared to give DAB-APy-PDI and DAB-APy-PDI-APy-DAB. In toluene, both triads are monomeric, but in methylcyclohexane, they self-assemble into ordered helical heptamers and hexamers, respectively, in which the PDI molecules are {pi}-stacked in a columnar fashion, as evidenced by small- and wide-angle X-ray scattering. Photoexcitation of these supramolecular assemblies results in rapid formation of DAB{sup +}-PDI{sup -} spin-polarized radical ion pairs having spin-spin dipolar interactions, which show that the average distance between the two radical ions is much larger in the assemblies (31 {angstrom}) than it is in their monomeric building blocks (23 {angstrom}). This work demonstrates that electron hopping through the {pi}-stacked PDI molecules is fast enough to compete effectively with charge recombination (40 ns) in these systems, making these materials of interest as photoactive assemblies for artificial photosynthesis and organic photovoltaics.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1005836
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Am. Chem. Soc.; Journal Volume: 131; Journal Issue: (33) ; 08, 2009
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ATOMS; BINDING ENERGY; CHARGE TRANSPORT; ELECTRONS; IMIDES; ION PAIRS; NITROGEN; PHOTOSYNTHESIS; RADICALS; RECOMBINATION; SCATTERING; TOLUENE; VALENCE

Citation Formats

Bullock, Joseph E., Carmieli, Raanan, Mickley, Sarah M., Vura-Weis, Josh, Wasielewski, Michael R., and NWU). Photoinitiated Charge Transport through π-Stacked Electron Conduits in Supramolecular Ordered Assemblies of Donor−Acceptor Triads. United States: N. p., 2009. Web. doi:10.1021/ja903903q.
Bullock, Joseph E., Carmieli, Raanan, Mickley, Sarah M., Vura-Weis, Josh, Wasielewski, Michael R., & NWU). Photoinitiated Charge Transport through π-Stacked Electron Conduits in Supramolecular Ordered Assemblies of Donor−Acceptor Triads. United States. doi:10.1021/ja903903q.
Bullock, Joseph E., Carmieli, Raanan, Mickley, Sarah M., Vura-Weis, Josh, Wasielewski, Michael R., and NWU). Fri . "Photoinitiated Charge Transport through π-Stacked Electron Conduits in Supramolecular Ordered Assemblies of Donor−Acceptor Triads". United States. doi:10.1021/ja903903q.
@article{osti_1005836,
title = {Photoinitiated Charge Transport through π-Stacked Electron Conduits in Supramolecular Ordered Assemblies of Donor−Acceptor Triads},
author = {Bullock, Joseph E. and Carmieli, Raanan and Mickley, Sarah M. and Vura-Weis, Josh and Wasielewski, Michael R. and NWU)},
abstractNote = {Photochemical electron donor-acceptor triads having an aminopyrene primary donor (APy) and a p-diaminobenzene secondary donor (DAB) attached to either one or both imide nitrogen atoms of a perylene-3,4:9,10-bis(dicarboximide) (PDI) electron acceptor were prepared to give DAB-APy-PDI and DAB-APy-PDI-APy-DAB. In toluene, both triads are monomeric, but in methylcyclohexane, they self-assemble into ordered helical heptamers and hexamers, respectively, in which the PDI molecules are {pi}-stacked in a columnar fashion, as evidenced by small- and wide-angle X-ray scattering. Photoexcitation of these supramolecular assemblies results in rapid formation of DAB{sup +}-PDI{sup -} spin-polarized radical ion pairs having spin-spin dipolar interactions, which show that the average distance between the two radical ions is much larger in the assemblies (31 {angstrom}) than it is in their monomeric building blocks (23 {angstrom}). This work demonstrates that electron hopping through the {pi}-stacked PDI molecules is fast enough to compete effectively with charge recombination (40 ns) in these systems, making these materials of interest as photoactive assemblies for artificial photosynthesis and organic photovoltaics.},
doi = {10.1021/ja903903q},
journal = {J. Am. Chem. Soc.},
number = (33) ; 08, 2009,
volume = 131,
place = {United States},
year = {Fri Sep 25 00:00:00 EDT 2009},
month = {Fri Sep 25 00:00:00 EDT 2009}
}