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000173062 0247_ $$2doi$$a10.1002/cctc.201400066
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000173062 037__ $$aFZJ-2014-06475
000173062 041__ $$aEnglish
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000173062 1001_ $$0P:(DE-HGF)0$$aHocking, Rosalie K.$$b0$$eCorresponding Author
000173062 245__ $$aFormation of a Nanoparticulate Birnessite - Like Phase in Purported Molecular Water Oxidation Catalyst Systems
000173062 260__ $$aWeinheim$$bWILEY-VCH Verlag$$c2014
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000173062 520__ $$aThe fate of [MnIII/IV2(μ-O)2(terpy)2(H2O)2]3+ (1) under conditions typically applied to test its ability to catalyze water oxidation was studied by X-ray absorption spectroscopy and UV/Vis spectrophotometry by using [MnIII/IV2(μ-O)2(bipy)4]3+ (2) and Mn2+ as controls (terpy=2,2′:6′,2“-terpyridine, bipy=2,2′-bipyridine). The sample matrix, pH and choice of oxidizing agent were found to have a significant effect on the species formed under catalytic conditions. At low range pH values (4–6), homogeneous catalysis testing in oxone implied that 1 remains intact, whereas in clay intercalate there is strong evidence that 1 breaks down to a birnessite-like phase. In homogeneous solutions at higher pH, the results are consistent with the same birnessite-like structure identified in the clay intercalate. The use of the molecular complexes, as a source of manganese instead of simple MnII salts, was found to have the effect of slowing down oxide formation and particle aggregation in solution. The original analytical results that implied the systems are molecular are discussed in the context of these new observations.
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000173062 7001_ $$0P:(DE-HGF)0$$aMalaeb, Rafah$$b1
000173062 7001_ $$0P:(DE-HGF)0$$aGates, Will P.$$b2
000173062 7001_ $$0P:(DE-HGF)0$$aPatti, Antonio F.$$b3
000173062 7001_ $$0P:(DE-Juel1)159156$$aChang, Lan-Yun$$b4$$ufzj
000173062 7001_ $$0P:(DE-HGF)0$$aDevlin, Glyn$$b5
000173062 7001_ $$0P:(DE-HGF)0$$aMacFarlane, Douglas R.$$b6
000173062 7001_ $$0P:(DE-HGF)0$$aSpiccia, Leone$$b7
000173062 773__ $$0PERI:(DE-600)2501161-3$$a10.1002/cctc.201400066$$p2028 - 2038$$tChemCatChem$$v6$$x1867-3880$$y2014
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