Magnetic Field Effects on Photoelectrochemical Responses of Modified Electrodes with Porphyrin-Viologen Linked Compound as Langmuir Blodgett Film

Abstract

Modified electrodes were fabricated by depositing a monolayer containing porphyrin-viologen linked compound on ITO electrodes by Langmuir-Blodgett method. Visible light irradiation on the modified electrodes afforded stable anodic photocurrents. The photocurrents clearly increased in the presence of magnetic fields. The magnetic field effects on photocurrents, as observed for the first time, are ascribed to the contribution of triplet radical pairs.

Photocurrent enhancements in a porphyrin-viologen linked compound under plasmonic and magnetic fields

“…First, the modified ITO-electrodes were prepared by depositing a mixed monolayer consisting of ZnP(6)V or ZnP(6)AB and AA (1:10) on ITO-electrodes (1 layer) using the LB technique [16][17][18]. A chloroform solution containing the porphyrin derivatives [ZnP(6)V and ZnP(6)AB] (0.2 mM) mixed with AA (2 mM) at a molar ratio of 1:10 was spread over a water subphase containing CaCl 2 (0.3 mM) and NaHCO 3 (0.05 mM, pH 7.0).…”

“…We examined the MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with zinc-tetraphenylporphyrin (ZnP)-viologen (V 2+ ) linked compounds [ZnP(n)V (n = 4, 6, 8)] with four, six, or eight methylene groups [16][17][18] and containing semiconductor nanoparticles [19,20]. We also examined the MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with nanoclusters containing a C 60 derivative and a methylphenothiazine group to demonstrate the use of C 60 in a photonic nanodevice [21].…”

Magnetic field effects on photoelectrochemical reactions of modified electrodes with C60-phenothiazine nanoclusters

“…15% at 0.5 T in the case of ZnP(8)V-modified electrode) [26,27]. However, the magnetic field dependence for the modified electrode with the nanoclusters of the mixture of C 60 N + and MePH is different (Fig.…”

“…Photocurrents from the modified electrode were measured under a controlled potential at 0 V vs. Ag/AgCl with a potentiostat in the presence of triethanolamine (TEOA) (50 mM) as a sacrificial electron donor under nitrogen atmosphere. The MFEs on the photoelectrochemical measurements were carried out according to the previous paper [26][27][28][29]. The electrode cell was placed at pole-gap of an electromagnet.…”

“…MFEs on the photoelectrochemical reactions of photosensitive electrodes are very important for practical applications of the MFEs to control the photoelectronic functions of molecular devices. Previously, we have examined MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with zinc-tetraphenylporphyrin-viologen linked compounds [26,27] and semiconductor nanoparticles [28,29]. However, MFEs on the photoelectrochemical reactions of photosensitive electrodes modified with nanoclusters have not yet been reported.…”