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Solvent dependence of the charge-transfer properties of a quaterthiophene–anthraquinone dyad

Paper ID Volume ID Publish Year Pages File Format Full-Text
28033 44056 2008 11 PDF Available
Title
Solvent dependence of the charge-transfer properties of a quaterthiophene–anthraquinone dyad
Abstract

An electron donor–acceptor dyad (quaterthiophene–anthraquinone) mediates ultrafast intramolecular photoinduced charge separation and consequent charge recombination when in polar or moderately polar solvents. Alternatively, non-polar media completely impedes the initial photoinduced electron transfer by causing enough destabilization of the charge-transfer state and shifting its energy above the energy of the lowest locally excited singlet state. Furthermore, femtosecond transient-absorption spectroscopy reveals that for the solvents mediating the initial photoinduced electron-transfer process, the charge recombination rates were slower than the rates of charge separation. This behavior of donor–acceptor systems is essential for solar-energy-conversion applications. For the donor–acceptor dyad described in this study, the electron-transfer driving force and reorganization energy place the charge-recombination processes in the Marcus inverted region.

Keywords
Oligothiophene; Quinone; Electron transfer; Charge separation; Charge recombination; Fluorescence quenching; Laser flash photolysis; Charge-transfer rate; Rehm weller equation; Born equation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issues 2–3, 25 June 2008, Pages 364–374
Authors
, , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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