2024-03-29T01:30:12Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/801972022-11-17T02:08:08Zhdl_2115_20039hdl_2115_116The effect of pyridyl anchoring groups at the surfaces of Ru(II)-dyesensitized TiO2 nanoparticles on photocatalytic oxygen evolutionOtsuka, HirokiKobayashi, Atsushi1000020712293Yoshida, Masaki1000080214401Kato, Masakoopen access©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 InternationalPhotocatalystWater oxidationDye-sensitizationArtificial photosynthesisRu(II) complex430Photocatalytic 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.Elsevier2019-01-15engjournal articleAMhttp://hdl.handle.net/2115/80197https://doi.org/10.1016/j.jphotochem.2018.10.0191010-6030Journal of photochemistry and photobiology a-chemistry369189194https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/80197/1/Otsuka_RuPy-paper-14th-for-publication.pdfapplication/pdf548.52 KB2019-01-15