NDLI: Cyclic Tetramers of Zinc Chlorophylls as a Coupled Light-Harvesting Antenna–Charge-Separation System

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Cyclic Tetramers of Zinc Chlorophylls as a Coupled Light-Harvesting Antenna–Charge-Separation System

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Cyclic Tetramers of Zinc Chlorophylls as a Coupled Light-Harvesting Antenna–Charge-Separation System

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Shinozaki, Yoshinao Fukuzumi, Shunichi Otsuki, Joe Sugawa, Kosuke Ohkubo, Kei
Description	Author Affiliation: Shinozaki Y ( College of Science and Technology, Nihon University, 1-8-14 Kanda Surugadai, Chiyoda-ku, Tokyo, 101-8308, Japan.); Ohkubo K ( Department of Material and Life Science, Graduate School of Engineering, ALCA and SENTAN, JST, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.); Fukuzumi S ( Faculty of Science and Engineering, Meijo University, ALCA and SENTAN, JST, Nagoya, Aichi, 468-0073, Japan.); Sugawa K ( Department of Material and Life Science, Graduate School of Engineering, ALCA and SENTAN, JST, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan. fukuzumi@chem.eng.osaka-u.ac.jp.); Otsuki J ( Department of Bioinspired Science, Ewha Womans University, Seoul, 120-750, Korea. fukuzumi@chem.eng.osaka-u.ac.jp.)
Abstract	A coupled light-harvesting antenna–charge-separation system, consisting of self-assembled zinc chlorophyll derivatives that incorporate an electron-accepting unit, is reported. The cyclic tetramers that incorporated an electron acceptor were constructed by the co-assembly of a pyridine-appended zinc chlorophyll derivative, ZnPy, and a zinc chlorophyll derivative further decorated with a fullerene unit, $ZnPyC_{60}.$ Comprehensive steady-state and time-resolved spectroscopic studies were conducted for the individual tetramers of ZnPy and $ZnPyC_{60}$ as well as their co-tetramers. Intra-assembly singlet energy transfer was confirmed by singlet–singlet annihilation in the ZnPy tetramer. Electron transfer from the singlet chlorin unit to the fullerene unit was clearly demonstrated by the transient absorption of the fullerene radical anion in the $ZnPyC_{60}$ tetramer. Finally, with the co-tetramer, a coupled light-harvesting and charge-separation system with practically 100 % quantum efficiency was demonstrated.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	3
Volume Number	22
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2016-01-18
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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