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

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