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- Title
Near-Infrared Light-Driven Hydrogen Evolution from Water Using a Polypyridyl Triruthenium Photosensitizer.
- Authors
Tsuji, Yutaro; Yamamoto, Keiya; Yamauchi, Kosei; Sakai, Ken
- Abstract
In order to realize artificial photosynthetic devices for splitting water to H2 and O2 (2 H2O+ hν→2 H2+O2), it is desirable to use a wider wavelength range of light that extends to a lower energy region of the solar spectrum. Here we report a triruthenium photosensitizer [Ru3(dmbpy)6(μ-HAT)]6+ (dmbpy=4,4′-dimethyl-2,2′-bipyridine, HAT=1,4,5,8,9,12-hexaazatriphenylene), which absorbs near-infrared light up to 800 nm based on its metal-to-ligand charge transfer (1MLCT) transition. Importantly, [Ru3(dmbpy)6(μ-HAT)]6+ is found to be the first example of a photosensitizer which can drive H2 evolution under the illumination of near-infrared light above 700 nm. The electrochemical and photochemical studies reveal that the reductive quenching within the ion-pair adducts of [Ru3(dmbpy)6(μ-HAT)]6+ and ascorbate anions affords a singly reduced form of [Ru3(dmbpy)6(μ-HAT)]6+, which is used as a reducing equivalent in the subsequent water reduction process.
- Subjects
PYRIDYL compounds; HYDROGEN evolution reactions; RUTHENIUM compound synthesis; POLYPYRIDINES; ION pairs; PHOTOSENSITIZERS; SOLAR spectra
- Publication
Angewandte Chemie, 2018, Vol 130, Issue 1, p214
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201708996