Details

Autor(en) / Beteiligte

• Li, Guoping
• Xu, Letian
• Zhang, Weidong
• Zhou, Kun
• Ding, Yousong
• Liu, Fenglin
• He, Xiaoming
• He, Gang

Titel

Narrow‐Bandgap Chalcogenoviologens for Electrochromism and Visible‐Light‐Driven Hydrogen Evolution

Ist Teil von

• Angewandte Chemie (International ed.), 2018-04, Vol.57 (18), p.4897-4901

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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, in 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. Narrow‐bandgap chalcogenoviologens have been developed by a combination of viologens with chalcogenophenes. These compounds show fascinating electrochromic applications, such as the visible‐light‐driven hydrogen evolution. Adding chalcogens to viologens disturbs their electronic structure, which allows them to be used for many different applications.