Photoinduced asymmetric charge trapping in a symmetric tetraazapyrene-fused bis(tetrathiafulvalene) conjugate.

Autor:	Zhou P; Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern Freiestrasse 3 CH-3012 Bern Switzerland shi-xia.liu@unibe.ch., Nazari Haghighi Pashaki M; Institute of Applied Physics, University of Bern Sidlerstrasse 5 CH-3012 Bern Switzerland andrea.cannizzo@unibe.ch., Frey HM; Institute of Applied Physics, University of Bern Sidlerstrasse 5 CH-3012 Bern Switzerland andrea.cannizzo@unibe.ch., Hauser A; Department of Physical Chemistry, University of Geneva 30 Quai Ernest Ansermet CH-1211 Geneva Switzerland., Decurtins S; Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern Freiestrasse 3 CH-3012 Bern Switzerland shi-xia.liu@unibe.ch., Cannizzo A; Institute of Applied Physics, University of Bern Sidlerstrasse 5 CH-3012 Bern Switzerland andrea.cannizzo@unibe.ch., Feurer T; Institute of Applied Physics, University of Bern Sidlerstrasse 5 CH-3012 Bern Switzerland andrea.cannizzo@unibe.ch., Häner R; Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern Freiestrasse 3 CH-3012 Bern Switzerland shi-xia.liu@unibe.ch., Aschauer U; Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern Freiestrasse 3 CH-3012 Bern Switzerland shi-xia.liu@unibe.ch.; Department of Chemistry and Physics of Materials, University of Salzburg Jakob-Haringer-Straße 2A 5020 Salzburg Austria ulrichjohannes.aschauer@plus.ac.at., Liu SX; Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern Freiestrasse 3 CH-3012 Bern Switzerland shi-xia.liu@unibe.ch.
Jazyk:	angličtina
Zdroj:	Chemical science [Chem Sci] 2023 Oct 25; Vol. 14 (44), pp. 12715-12722. Date of Electronic Publication: 2023 Oct 25 (Print Publication: 2023).
DOI:	10.1039/d3sc03184e
Abstrakt:	In fused donor-acceptor (D-A) ensembles, rapid charge recombination often occurs because the D and A units are spatially close and strongly coupled. To the best of our knowledge, a long-lived charge separated (CS) state is still elusive in such systems. The results presented here show that symmetric annulation of two tetrathiafulvalene (TTF) donors to a central tetraazapyrene (TAP) acceptor via two quinoxaline units leads to a CS state lifetime of a few ns. A detailed study of the electronic interactions between TTF and TAP units in the ground and excited states was performed and compared with the asymmetric counterpart by cyclic voltammetry, optical absorption and ultrafast transient absorption spectroscopy. The results demonstrate that the photoinduced asymmetric charge trapping between two TTFs significantly stabilizes the CS state, which is also verified theoretically. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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