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- Title
Ru-bis(pyridine)pyrazolate (bpp)-Based Water-Oxidation Catalysts Anchored on TiO<sub>2</sub>: The Importance of the Nature and Position of the Anchoring Group.
- Authors
Francàs, Laia; Richmond, Craig; Garrido‐Barros, Pablo; Planas, Nora; Roeser, Stephan; Benet‐Buchholz, Jordi; Escriche, Lluís; Sala, Xavier; Llobet, Antoni
- Abstract
Three distinct functionalisation strategies have been applied to the in, in-[{RuII(trpy)}2(μ-bpp)(H2O)2]3+ (trpy=2,2′:6′,2′′-terpyridine, bpp=bis(pyridine)pyrazolate) water-oxidation catalyst framework to form new derivatives that can adsorb onto titania substrates. Modifications included the addition of sulfonate, carboxylate, and phosphonate anchoring groups to the terpyridine and bis(pyridyl)pyrazolate ligands. The complexes were characterised in solution by using 1D NMR, 2D NMR, and UV/Vis spectroscopic analysis and electrochemical techniques. The complexes were then anchored on TiO2-coated fluorinated tin oxide (FTO) films, and the reactivity of these new materials as water-oxidation catalysts was tested electrochemically through controlled-potential electrolysis (CPE) with oxygen evolution detected by headspace analysis with a Clark electrode. The results obtained highlight the importance of the catalyst orientation with respect to the titania surface in regard to its capacity to catalytically oxidize water to dioxygen.
- Subjects
OXIDATION of water; CHEMICAL derivatives; ELECTROLYSIS; ELECTRODES; DIOXYGENASES; LIGANDS (Chemistry)
- Publication
Chemistry - A European Journal, 2016, Vol 22, Issue 15, p5261
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201504015