A Ruthenium Complex–Porphyrin–Fullerene‐Linked Molecular Pentad as an Integrative Photosynthetic Model. Issue 12 (14th February 2017)

• Record Type: Journal Article
• Authors: Yamamoto, Masanori; Föhlinger, Jens; Petersson, Jonas; Hammarström, Leif; Imahori, Hiroshi
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 12(2017)
• Page Start: 3329
• Page End: 3333
• Publication Date: 2017-02-14
• Subjects: artificial photosynthesis -- fullerenes -- molecular pentads -- photoinduced electron transfer -- porphyrins -- ruthenium; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201612456
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A ruthenium complex, porphyrin sensitizer, fullerene acceptor molecular pentad has been synthesized and a long‐lived hole–electron pair was achieved in aqueous solution by photoinduced multistep electron transfer: Upon irradiation by visible light, the excited‐state of a zinc porphyrin ( 1 ZnP*) was quenched by fullerene (C60 ) to afford a radical ion pair, 1, 3 (ZnP .+ ‐C60 .− ). This was followed by the subsequent electron transfer from a water oxidation catalyst unit (Ru II ) to ZnP .+ to give the long‐lived charge‐separated state, Ru III ‐ZnP‐C60 .−, with a lifetime of 14 μs. The ZnP worked as a visible‐light‐harvesting antenna, while the C60 acted as an excellent electron acceptor. As a consequence, visible‐light‐driven water oxidation by this integrated photosynthetic model compound was achieved in the presence of sacrificial oxidant and redox mediator. Abstract : Pent‐up energy : A ruthenium‐based water oxidation catalyst linked to porphyrin–fullerene units in a molecular pentad has been synthesized. Transient absorption indicated the photoinduced multistep electron transfer afforded a long‐lived hole–electron pair, and photocatalytic water oxidation by the pentad was achieved in the presence of sacrificial oxidant.