Narrow-Bandgap Chalcogenoviologens for Electrochromism and Visible-Light-Driven Hydrogen Evolution.
Angew Chem Int Ed Engl
; 57(18): 4897-4901, 2018 04 23.
Article
en En
| MEDLINE
| ID: mdl-29489048
ABSTRACT
A series of electron-accepting chalcogen-bridged viologens with narrow HOMO-LUMO bandgaps and low LUMO levels is reported. The optoelectronic properties of chalcogenoviologens can be readily tuned through heavy atom substitution (S, Se and Te). Herein, inâ
situ electrochemical spectroscopy was performed on the proof-of-concept electrochromic devices (ECD). E-BnV2+ (E=Se, Te; BnV2+ =benzyl viologen) was used for the visible-light-driven hydrogen evolution due to the strong visible-light absorption. Remarkably, E-BnV2+ was not only used as a photosensitizer, but also as an electron mediator, providing a new strategy to explore photocatalysts. The higher apparent quantum yield of Se-BnV2+ could be interpreted in terms of different energy levels, faster electron-transfer rates and faster formation of radical species.
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Año:
2018
Tipo del documento:
Article
País de afiliación:
China