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Title: Guest and solvent modulated photo-driven charge separation and triplet generation in a perylene bisimide cyclophane

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/c6sc01574c· OSTI ID:1434679
 [1];  [2];  [2];  [1]
  1. Univ. Wurzburg, Wurzburg (Germany)
  2. Northwestern Univ., Evanston, IL (United States)

Cofacial positioning of two perylene bisimide (PBI) chromophores at a distance of 6.5 Å in a cyclophane structure prohibits the otherwise common excimer formation and directs photoexcited singlet state relaxation towards intramolecular symmetry-breaking charge separation (τCS = 161 ± 4 ps) in polar CH2Cl2, which is thermodynamically favored with a Gibbs free energy of ΔGCS = –0.32 eV. The charges then recombine slowly in τCR = 8.90 ± 0.06 ns to form the PBI triplet excited state, which can be used subsequently to generate singlet oxygen in 27% quantum yield. This sequence of events is eliminated by dissolving the PBI cyclophane in non-polar toluene, where only excited singlet state decay occurs. In contrast, complexation of electron-rich aromatic hydrocarbons by the host PBI cyclophane followed by photoexcitation of PBI results in ultrafast electron transfer (<10 ps) from the guest to the PBI in CH2Cl2. As a result, the rate constants for charge separation and recombination increase as the guest molecules become easier to oxidize, demonstrating that charge separation occurs close to the peak of the Marcus curve and the recombination lies far into the Marcus inverted region.

Research Organization:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
FG02-99ER14999
OSTI ID:
1434679
Journal Information:
Chemical Science, Vol. 7, Issue 8; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Protein‐like Enwrapped Perylene Bisimide Chromophore as a Bright Microcrystalline Emitter Material journal August 2019
Protein-like Enwrapped Perylene Bisimide Chromophore as a Bright Microcrystalline Emitter Material journal August 2019
Photoinduced Energy‐ and Electron‐Transfer Processes in a Side‐to‐Face Ru II ‐Porphyrin/Perylene‐bisimide Array journal August 2019
Control of triplet state generation in heavy atom-free BODIPY–anthracene dyads by media polarity and structural factors journal January 2018
Extending the scope of the carbonyl facilitated triplet excited state towards visible light excitation journal January 2018
A supramolecular radical cation: folding-enhanced electrostatic effect for promoting radical-mediated oxidation journal January 2018
Choosing sides: unusual ultrafast charge transfer pathways in an asymmetric electron-accepting cyclophane that binds an electron donor journal January 2019
Guest-mediated chirality transfer in the host–guest complexes of an atropisomeric perylene bisimide cyclophane host journal January 2019
Enhanced triplet state generation through radical pair intermediates in BODIPY-quantum dot complexes journal December 2019
A Water-Soluble Perylene Bisimide Cyclophane as a Molecular Probe for the Recognition of Aromatic Alkaloids journal January 2019