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Majid JAFARIAN Mehdi RASHVAND AVEI Iman DANAEE Fereydoon GOBAL Mohammad G.MAHJANI 《催化学报》2010,31(11):1351-1357
A stable copper (hydr)oxide-modified electrode was prepared in 0.5 mol/L NaOH solution by cyclic voltammetry in the range of -250 to 1 000 mV. It can be used for electrochemical studies in the range of -250 to 1 000 mV without interfering peaks because there is no oxidation of copper. During an anodic potential sweep, the electro-oxidation of saccharose on Cu occurred by the formation of CuIII and this reaction also occurred in the early stages of the reversed cycle until it is stopped by the negative potentials. A mechanism based on the electro-chemical generation of CuIII active sites and their subsequent consumption by saccharose was proposed, and the rate law and kinetic parameters were obtained. The charge transfer resistance from theoretical and impedance studies was used to verify the mechanism. Under chronoamperometry regimes, the reaction followed Cottrellian behavior. The transfer of up to 21 electrons was observed in further investigations of the electro-oxidation of saccharose on a (hydr)oxide Cu rotating disk electrode. 相似文献
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Qu Lingbo Chen Xiaolan Lu Jiansha Yuan Jingwei Zhao Yufen 《Chemistry of Natural Compounds》2005,41(5):565-568
Six substances were isolated from the branches and leaves of the Chinese herb Leptopus Chinensis (Bunge) Pojark. by column chromatography for the first time. Their structures were elucidated as 3α-hydroxyfriedelan-2-one,
saccharose, triacontanol, friedelane-2α,3β-diols, β-sitosterol-3-O-β-D-glucoside, and β -sitosterol on the basis of x-ray,
chemical, and spectroscopic methods.
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Published in Kimiya Prirodnikh Soedinenii, No. 5, pp. 462–464, September–October, 2005. 相似文献
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A. F. Artamonov M. T. Aldabergenova F. S. Nigmatullina B. Zh. Dzhiembaev 《Chemistry of Natural Compounds》2000,36(4):345-348
Di- and triesters of saccharose with aromatic acids are synthesized by transesterification of the methyl esters of the corresponding acids with saccharose. The structures of the resulting compounds are confirmed by IR spectroscopy, PMR, and
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C NMR. 相似文献
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A new version of the regressive technique is proposed for calculating adsorption parameters from two-dimensional pressure isotherms. The method assumes that the Frumkin isotherm is applicable to individual adsorption of surface-active neutral molecules and single-charged ions. Based on literature data, the adsorption parameters are assessed for tetraethylammonium, tetrapropylammonium, and tetrabutylammonium cations and for saccharose molecules for their adsorption from aqueous solutions on the uncharged mercury surface. 相似文献
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