Magnetic Field Effects on Photoelectrochemical Reactions of Porphyrin–Viologen Linked Compounds in an Ionic Liquid

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<jats:p> Magnetic field effects (MFEs) on photoelectrochemical reactions of three porphyrin–viologen linked compounds with various methylene groups [ZnP(<jats:italic>n</jats:italic>)V (<jats:italic>n</jats:italic>=4,6,8)] were examined in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF<jats:sub>4</jats:sub>]) as an ionic liquid using a two-electrode cell. Stable anodic photocurrents are produced by irradiating ZnP(<jats:italic>n</jats:italic>)V (<jats:italic>n</jats:italic>=4,6,8) in [BMIM][BF<jats:sub>4</jats:sub>] with visible light, and the MFEs on photocurrents were clearly observed in ZnP(<jats:italic>n</jats:italic>)V (<jats:italic>n</jats:italic>=4,6,8). The MFEs on photocurrents increase with magnetic field for lower magnetic fields (<jats:italic>B</jats:italic> ≤200 mT) and are constant for higher magnetic fields (<jats:italic>B</jats:italic> > 200 mT). The magnitude of the MFEs in ZnP(<jats:italic>n</jats:italic>)V (<jats:italic>n</jats:italic>=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(<jats:italic>n</jats:italic>)V (<jats:italic>n</jats:italic>=4,6,8) as Langmuir–Blodgett films. The results are most likely attributable to the properties of [BMIM][BF<jats:sub>4</jats:sub>] and the mechanism of photoelectrochemical reaction. </jats:p>

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