Distinct Proton and Water Reduction Behavior with a Cobalt(III) Electrocatalyst Based on Pentadentate Oximes
作者:Debashis Basu、Shivnath Mazumder、Xuetao Shi、Richard J. Staples、H. Bernhard Schlegel、Cláudio N. Verani
DOI:10.1002/anie.201501410
日期:2015.6.8
A new pentadentateoxime has been designed to drive the preferential coordination favored by CoI in catalysts used for proton/waterreduction. The ligand incorporates water upon metal coordination and is water soluble. This CoIII species is doubly reduced to CoI and exhibits H+ reduction activity in the presence of weak acids in MeCN and evolves H2 upon protonation suggesting that the ligand design
Biomimetic Oxidation of 3,5-Di-<i>tert</i>-butylcatechol by Dioxygen via Mn-Enhanced Base Catalysis
作者:Imola Cs. Szigyártó、László I. Simándi、László Párkányi、László Korecz、Gitta Schlosser
DOI:10.1021/ic060618v
日期:2006.9.1
The 6-coordinate dioximatomanganese(II) complex [Mn(HL)(CH3OH)](+) (2, where H2L is [HON=C(CH3) C(CH3) = NCH2CH2] 2NH), formed by instant solvolysis of [Mn-2(HL)(2)](BPh4)(2) (1) in methanol, accelerates the triethylamine (TEA)-catalyzed oxidation of 3,5-di-tert-butylcatechol (H(2)dtbc) by O-2 to the corresponding o-benzoquinone. Significantly, 2 alone has no catalytic effect. The observed rate increase can be explained by the interaction of 2 with the hydroperoxo intermediate HdtbcO(2)-formed from Hdtbc-and O-2 in the TEA-catalyzed oxidation. The kinetics of the TEA-catalyzed and Mn-enhanced reaction has been studied by gas-volumetric monitoring of the amount of O2 consumed. The initial rate of O2 uptake (V in) shows a first-order dependence on the concentration of 2 and O2 and saturation kinetics with respect to both H2dtbc and TEA. The observed kinetic behavior is consistent with parallel TEA-catalyzed and Mn-enhanced oxidation paths. The 3,5-di -tert-butylsemiquinone anion radical is an intermediate detectable by electron spin resonance (ESR) spectroscopy. The dimeric catalyst precursor has been characterized by X-ray diffraction and electrospray ionization mass spectrometry and the monomeric catalyst by ESR spectroscopy.
Organic compounds and method of making same
申请人:RESEARCH CORP
公开号:US02400876A1
公开(公告)日:1946-05-28
Binuclear dioxomolybdenum(VI) complexes containing bridging dioxime schiff base ligands
作者:R.N. Mohanty、K.C. Dash
DOI:10.1016/s0277-5387(00)81286-3
日期:1990.1
Singh, S.; Chakravortty, V.; Dash, K. C., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 4, p. 397 - 399