Electrocatalytic oxidation of thiosulfate at the 2,7-BFEFMCPE occurs at a potential about 460 mV less positive than that unmodified carbon paste electrode.The diffusion coefficient（=5.6×10^-5）cm^2 s^-1）,the ki...Electrocatalytic oxidation of thiosulfate at the 2,7-BFEFMCPE occurs at a potential about 460 mV less positive than that unmodified carbon paste electrode.The diffusion coefficient（=5.6×10^-5）cm^2 s^-1）,the kinetic parameters such as electron transfer coefficient,（=0.5） and kh（=1.21×10^-3 cm s^-1） of thiosulfate oxidation at the surface of,2,7-BFEFMCPE were determined.The electrocatalytic oxidation peak current of thiosulfate showed two linear dynamic ranges（0.0006-0.009 mmol/L and 0.009- 0.900 mmol/L） and a detection limit of 0.00015 mmol/L.This method was also examined as a new electrochemical sensor for the determination of thiosulfate in real sample.展开更多
In search for new antioxidant agents derived from 6-azauracil, the spiro-5-(flurin-9’-yl)-6-azauracil <strong>3</strong> and their <em>N</em>,<em>N</em>-disubstituted-6-azauracils ...In search for new antioxidant agents derived from 6-azauracil, the spiro-5-(flurin-9’-yl)-6-azauracil <strong>3</strong> and their <em>N</em>,<em>N</em>-disubstituted-6-azauracils <strong>4</strong> - <strong>17</strong> have been synthesized using various methods and reaction conditions. Structure of the new synthesized compounds was deduced from elemental analysis and spectral measurements, for example IR, 1H/13C NMR and mass spectroscopy. The antioxidant evaluation of the new targets showed that the activity increases in the order of <strong>8</strong> > <strong>10</strong> > <strong>6</strong> > <strong>7</strong> > <strong>9</strong> in comparison with 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and ascorbic acid as standards.展开更多
在优化条件下,用NaH、n-BuLi、THF、芴、溴、二溴代烃、二酮为原料,通过溴代反应合成了新型的含芴发光材料前体9-(2,7-二溴-9-正丁基-9-H-芴)壬烷-2,4-二酮(DBBFOD);产物的收率为56%,纯度>99%,其结构经1 H NMR、13 C NMR、MS和元素...在优化条件下,用NaH、n-BuLi、THF、芴、溴、二溴代烃、二酮为原料,通过溴代反应合成了新型的含芴发光材料前体9-(2,7-二溴-9-正丁基-9-H-芴)壬烷-2,4-二酮(DBBFOD);产物的收率为56%,纯度>99%,其结构经1 H NMR、13 C NMR、MS和元素分析确证.展开更多
文摘Electrocatalytic oxidation of thiosulfate at the 2,7-BFEFMCPE occurs at a potential about 460 mV less positive than that unmodified carbon paste electrode.The diffusion coefficient（=5.6×10^-5）cm^2 s^-1）,the kinetic parameters such as electron transfer coefficient,（=0.5） and kh（=1.21×10^-3 cm s^-1） of thiosulfate oxidation at the surface of,2,7-BFEFMCPE were determined.The electrocatalytic oxidation peak current of thiosulfate showed two linear dynamic ranges（0.0006-0.009 mmol/L and 0.009- 0.900 mmol/L） and a detection limit of 0.00015 mmol/L.This method was also examined as a new electrochemical sensor for the determination of thiosulfate in real sample.
文摘In search for new antioxidant agents derived from 6-azauracil, the spiro-5-(flurin-9’-yl)-6-azauracil <strong>3</strong> and their <em>N</em>,<em>N</em>-disubstituted-6-azauracils <strong>4</strong> - <strong>17</strong> have been synthesized using various methods and reaction conditions. Structure of the new synthesized compounds was deduced from elemental analysis and spectral measurements, for example IR, 1H/13C NMR and mass spectroscopy. The antioxidant evaluation of the new targets showed that the activity increases in the order of <strong>8</strong> > <strong>10</strong> > <strong>6</strong> > <strong>7</strong> > <strong>9</strong> in comparison with 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and ascorbic acid as standards.
