open access

https://hdl.handle.net/2115/80197

The effect of pyridyl anchoring groups at the surfaces of Ru(II)-dyesensitized TiO2 nanoparticles on photocatalytic oxygen evolution

英語

Ru(II) complex

2019-01-15

Elsevier

Journal of photochemistry and photobiology a-chemistry

369

189-194

Photocatalytic oxygen evolution driven by two pyridyl-anchor-modified Ru(II) photosensitizers, namely [Ru (bpy)(2)(qpy)](PF6)(2) and [Ru(qpy)(3)](PF6)(2) (RuPy2 and RuPy6; bpy = 2,2'-bipyridine, qpy = 2,2'-4,4 ''-4',4'"-quaterpyridine), was examined in order to investigate the influence of pyridyl groups as the connectors that bind both the water-oxidation and water-reduction catalysts. RuPy2 and RuPy6 act as redox photosensitizers in the presence of the S2O82- sacrificial electron acceptor and the K2xCo(3-x)[Fe(CN)(6)](2)center dot nH(2)O, Prussian-blue-type, water-oxidation catalyst; however, their photosensitizing efficiencies were lower than that of [Ru(bpy)(3)](2+) because of their lower reactivities with S2O82-, probably due to steric hindrance associated with the pyridyl groups. Interestingly, the photosensitizing efficiency of RuPy2 was significantly improved through immobilization on TiO2 nanoparticles (RuPy2@TiO2), while the efficiency of RuPy6 was hardly improved by immobilization. These contrasting results indicate that the surface structure of the photosensitizer-immobilized nanoparticle is a crucial factor that determines photosensitizing and/or photocatalytic activity.

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