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Chemical and photoc...
Chemical and photocatalytic water oxidation by mononuclear Ru catalysts
- Article/chapterEnglish2013
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LIBRIS-ID:oai:DiVA.org:kth-128483
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128483URI
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https://doi.org/10.1016/S1872-2067(12)60600-7DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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QC 20130913
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Four mononuclear Ru complexes with different substituents on the para position of the pyridine ligand of Ru(bda)(pic)(2) (H(2)bda = 2,2'-bipyridine-6,6'-dicarboxylic acid; pic = picoline) were synthesized and characterized by H-1 nuclear magnetic resonance or X-ray crystallography. The electrochemical properties of this series of compounds in acidic and neutral conditions were studied by cyclic voltammetry. Their catalytic activity towards water oxidation was investigated using a chemical oxidant ([Ce(NH4)(2)(NO3)(6)] (Ce-IV) in acidic solution, or driven by visible light in a three-component system containing a photosensitizer ([Ru(bpy)(3)](2+)) and an electron acceptor (S2O82-). For the chemical water oxidation, complex 1 was found to be the most effective, exhibiting a turnover number (TON) of up to 4000. The pyridine substituent at the 4-position in 1 may be protonated giving an intensive electron-withdrawing effect. Complex 2 bears the most electron-withdrawing trifluoromethyl group under neutral conditions and showed the highest photocatalytic activity with a TON of 270 over 2 h. It was concluded that the more electron-withdrawing substituents led to higher activity towards oxygen evolution for this type of Ru catalysts in the oxidation of water.
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Li, Fei
(author)
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Huang, Fang
(author)
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Zhang, Biaobiao
(author)
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Sun, LichengKTH,Organisk kemi(Swepub:kth)u1umfd9h
(author)
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KTHOrganisk kemi
(creator_code:org_t)
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In:Cuihuà xuébào34:8, s. 1489-14950253-98371872-2067
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