Symmetry-breaking charge separation in weakly coupled anthracene dimers

Lv, Liping; Liu, Heyuan; Li, Tianyu; Cui, Boce; Wang, Tianying; Song, Xiaojuan; Chen, Wenmiao; Chen, Yanli; Li, Xiyou

doi:10.1039/d3tc03007e

J. Mater. Chem. C

2023

DOI: 10.1039/d3tc03007e

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Symmetry-breaking charge separation in weakly coupled anthracene dimers

Liping Lv,

Heyuan Liu,

Tianyu Li

et al.

Abstract: Symmetry-breaking charge separation (SB-CS), which could convert a singlet exciton into a pair of radical anion and cation, has the potential to be applied into organic photoelectric devices. It is...

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2024

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Distance‐Dependent Symmetry‐Breaking Charge Transfer in 9,10‐ Bis(phenylethynyl)anthracene Dimers

Wang,

Lv,

et al. 2024

Chemistry A European J

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To investigate the effect of the through‐bond coupling strength on the symmetry‐breaking charge separation (SB‐CS) dynamics and mechanism, three 9,10‐bis((4‐hexylphenyl)ethynyl)anthracene dimers with varying distances, viz., a single‐bond linked dimer (0‐dimer), a phenylene linked dimer (1‐dimer) and a para‐biphenylene linked dimer (2‐dimer), were synthesized and studied systematically using steady‐state and transient spectroscopy. Steady‐state absorption spectra revealed that the electronic coupling strength decreased gradually with the increase of the inter‐chromophore distance, and the transition of S0→S1 includes the dark charge transfer (CT) excitation. fs‐TA spectra demonstrated that SB‐CS could be conducted in both weakly and highly polar solvents for 0‐dimer, but the SB‐CS dynamics has a significant difference. In weakly polar solvents, SB‐CS only produces the partial CT (PCT) state, but it could generate the CT state via the PCT state in highly polar solvent. In comparison, SB‐CS is only proceeded in highly polar solvents in 1‐dimer and 2‐dimer to produce the CT state directly. These results demonstrate that the SB‐CS dynamics is strongly dependent on the inter‐chromophore electronic coupling, and the relatively strong electronic coupling is crucial for the occurrence of SB‐CS in weakly polar environment that is commonly presented in photoelectric devices.

show abstract

Distance‐Dependent Symmetry‐Breaking Charge Transfer in 9,10‐ Bis(phenylethynyl)anthracene Dimers

Wang,

Lv,

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

show abstract

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Symmetry-breaking charge separation in weakly coupled anthracene dimers

Abstract: Symmetry-breaking charge separation (SB-CS), which could convert a singlet exciton into a pair of radical anion and cation, has the potential to be applied into organic photoelectric devices. It is...

Cited by 1 publication

References 60 publications

Distance‐Dependent Symmetry‐Breaking Charge Transfer in 9,10‐ Bis(phenylethynyl)anthracene Dimers

Distance‐Dependent Symmetry‐Breaking Charge Transfer in 9,10‐ Bis(phenylethynyl)anthracene Dimers

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