Photoinduced hole transfer from tris(bipyridine)ruthenium dye to a high-valent iron-based water oxidation catalyst

An efficient water oxidation system is a prerequisite for developing solar energy conversion devices. Using advanced time-resolved spectroscopy, we study the initial catalytic relevant electron transfer events in the light-driven water oxidation system utilizing [Ru(bpy)(3)](2+) (bpy = 2,2 '-bipyridine) as a light harvester, persulfate as a sacrificial electron acceptor, and a high-valent iron clathrochelate complex as a catalyst. Upon irradiation by visible light, the excited state of the ruthenium dye is quenched by persulfate to afford a [Ru(bpy)(3)](3+)/SO4- pair, showing a cage escape yield up to 75%. This is followed by the subsequent fast hole transfer from [Ru(bpy)(3)](3+) to the Fe-IV catalyst to give the long-lived Fe-V intermediate in aqueous solution. In the presence of excess photosensitizer, this process exhibits pseudo-first order kinetics with respect to the catalyst with a rate constant of 3.2(1) x 10(10) s(-1). Consequently, efficient hole scavenging activity of the high-valent iron complex is proposed to explain its high catalytic performance for water oxidation.

Pavliuk, Mariia V.Uppsala universitet,Fysikalisk kemi,Uppsala Univ, Angstrom Lab, Dept Chem, POB 523, S-75120 Uppsala, Sweden(Swepub:uu)marpa882 (författare)
D'Amario, LucaUppsala universitet,Fysikalisk kemi,Free Univ Berlin, Phys Dept, Arnimallee 14, D-14195 Berlin, Germany(Swepub:uu)luclu960 (författare)
Fritsky, Igor O.Taras Shevchenko Natl Univ Kyiv, Dept Chem, Volodymyrska 64, UA-01601 Kiev, Ukraine;PBMR Labs Ukraine, Murmanska 1, UA-02094 Kiev, Ukraine (författare)
Berggren, GustavUppsala universitet,Molekylär biomimetik(Swepub:uu)guber255 (författare)
Uppsala universitetFysikalisk kemi (creator_code:org_t)

Ingår i:Faraday discussions: ROYAL SOC CHEMISTRY215, s. 162-1741359-66401364-5498

Av författaren/redakt...: Shylin, Sergii I ...; Pavliuk, Mariia ...; D'Amario, Luca; Fritsky, Igor O.; Berggren, Gustav

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