Magnetic Field Effects on Photoelectrochemical Reactions of Porphyrin--Viologen Linked Compounds in an Ionic Liquid
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概要
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Magnetic field effects (MFEs) on photoelectrochemical reactions of three porphyrin--viologen linked compounds with various methylene groups [ZnP($n$)V ($n=4,6,8$)] were examined in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF<sub>4</sub>]) as an ionic liquid using a two-electrode cell. Stable anodic photocurrents are produced by irradiating ZnP($n$)V ($n=4,6,8$) in [BMIM][BF<sub>4</sub>] with visible light, and the MFEs on photocurrents were clearly observed in ZnP($n$)V ($n=4,6,8$). The MFEs on photocurrents increase with magnetic field for lower magnetic fields ($B \leq 200$ mT) and are constant for higher magnetic fields ($B > 200$ mT). The magnitude of the MFEs in ZnP($n$)V ($n=6,8$) are larger than that in ZnP(4)V. The MFEs can be explained by radical pair mechanism. The magnitude of the MFEs is larger than those in electrodes modified with ZnP($n$)V ($n=4,6,8$) as Langmuir--Blodgett films. The results are most likely attributable to the properties of [BMIM][BF<sub>4</sub>] and the mechanism of photoelectrochemical reaction.
- 2011-08-25
著者
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Yamada Sunao
Department Of Applied Chemistry Faculty Of Engineering Kyushu University
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Yonemura Hiroaki
Department Of Applied Chemistry Faculty Of Engineering Kyushu University
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Harada Satoko
Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
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Tahara Hironobu
Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
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Yonemura Hiroaki
Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
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Tahara Hironobu
Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Yamada Sunao
Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
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