[RuV(NCN-Me)(bpy)(O)]3+ mediated efficient photo-driven water oxidation
| Autor: | Jully Patel, Sumanta Kumar Padhi, Karunamay Majee |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Electrolysis of water 010405 organic chemistry Chemistry General Chemical Engineering Inorganic chemistry Iodide General Chemistry Overpotential Electron acceptor 010402 general chemistry Photochemistry 01 natural sciences Redox 0104 chemical sciences Catalysis Deprotonation Photocatalysis |
| Zdroj: | RSC Advances. 6:61959-61965 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c6ra12074a |
| Popis: | The [Ru(NCN-Me)(bpy)H2O](PF6)2 complex (1) (where NCN-Me is the neutral N-methyl-3,5-di(2-pyridyl)pyridinium iodide after deprotonation of the C–H bond) acts as an active catalyst for the visible light driven oxidation of water, when employed with [Ru(bpy)3]2+ as the photosensitizer and Na2S2O8 as the sacrificial electron acceptor in a phosphate buffer solution at pH 6.5, in the presence of a visible light emitting diode (LED; visible light 10.2 mW cm−2) at 20 °C. The system exhibits very high activity, achieving 130 turnovers with respect to catalyst and an initial turnover rate TOF of 0.10 s−1. The controlled experiments conducted for the photo-oxidation of water indicate that the catalytic system is dependent upon the following: (i) a visible light source, (ii) photosensitizer, (iii) catalyst and, (iv) pH. During the photocatalysis of water oxidation for 2 h in a phosphate buffer solution at pH 6.5, there was no degradation of the catalyst 1, which indicates the good photo-stability of the complex. The NCN-Me coordinates as a neutral ligand after deprotonation of the central C–H bond; generating the negatively charged carbon center favors a reduction in the redox potential of the complex, which considerably lowers the overpotential to 100 mV at pH 6.5 for the oxidation of water. |
| Databáze: | OpenAIRE |
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