Base-enhanced catalytic water oxidation by a carboxylate–bipyridine Ru(II) complex
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; Brookhaven National Lab. (BNL), Upton, NY (United States)
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
- Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry; Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemistry and Biochemistry
In aqueous solution above pH 2.4 with 4% (vol/vol) CH3CN, the complex [RuII(bda)(isoq)2] (bda is 2,2'-bipyridine-6,6'-dicarboxylate; isoq is isoquinoline) exists as the open-arm chelate, [RuII(CO2-bpy-CO2$$-$$)(isoq)2(NCCH3)], as shown by 1H and 13C-NMR, X-ray crystallography, and pH titrations. Rates of water oxidation with the open-arm chelate are remarkably enhanced by added proton acceptor bases, as measured by cyclic voltammetry (CV). In 1.0 M PO43–, the calculated half-time for water oxidation is ~7 μs. In conclusion, the key to the rate accelerations with added bases is direct involvement of the buffer base in either atom–proton transfer (APT) or concerted electron–proton transfer (EPT) pathways.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Solar Fuels (UNC EFRC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Organization:
- UNC partners with University of North Carolina (lead); Duke University; University of Florida; Georgia Institute of Technology; University; North Carolina Central University; Research Triangle Institute
- Grant/Contract Number:
- SC0001011; CHE-0957215
- OSTI ID:
- 1210509
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 16; ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Related Subjects
catalysis (homogeneous)
catalysis (heterogeneous)
solar (photovoltaic)
solar (fuels)
photosynthesis (natural and artificial)
hydrogen and fuel cells
electrodes - solar
charge transport
materials and chemistry by design
synthesis (novel materials)
synthesis (self-assembly)
Ru polypyridyl complexes
electrocatalysis
solar energy
water oxidation catalysis
water splitting