The derivative fluorimetric characteristics of Tb—SDS and Tb—SDS—phenanthroline systems have been studied. The optimum conditions were obtained. The 2nd—derivative spectrofluorimetric method in the systems has be... The derivative fluorimetric characteristics of Tb—SDS and Tb—SDS—phenanthroline systems have been studied. The optimum conditions were obtained. The 2nd—derivative spectrofluorimetric method in the systems has been applied to the determination of trace amounts of terbium, in rare earth ore and their oxides. The results are satisfactory.展开更多
Aim To synthesize a new water-soluble Na 2(C15H8O5)(SO3) 2 and determine its structure.Method The new water-soluble apigenin sulfonated derivative was synthesized by sulfonation with concentrated sulfuric acid at 40℃...Aim To synthesize a new water-soluble Na 2(C15H8O5)(SO3) 2 and determine its structure.Method The new water-soluble apigenin sulfonated derivative was synthesized by sulfonation with concentrated sulfuric acid at 40℃for half an hour and the products were obtained in ethanol-water(V∶V =1∶1).The structure of the product was identified by IR,NMR spectrum and elemental analysis.Results and Conclusion After highly selective introduced two - SO 3 groups at C3′and C6of the substrate,the new water-soluble apigenin sulfonated derivative,sodium 5,7,4 '-trihydroxyflavone-6,3′-sulfonate was obtained in good yield(78%) at moderate conditions.This method is an ideal synthesis way because of its simple operation,mild reaction conditions,high selectivity,easy separation of the product and higher yield.展开更多
基金Project supported by the National Natural Science Foundation of China
文摘 The derivative fluorimetric characteristics of Tb—SDS and Tb—SDS—phenanthroline systems have been studied. The optimum conditions were obtained. The 2nd—derivative spectrofluorimetric method in the systems has been applied to the determination of trace amounts of terbium, in rare earth ore and their oxides. The results are satisfactory.
文摘Aim To synthesize a new water-soluble Na 2(C15H8O5)(SO3) 2 and determine its structure.Method The new water-soluble apigenin sulfonated derivative was synthesized by sulfonation with concentrated sulfuric acid at 40℃for half an hour and the products were obtained in ethanol-water(V∶V =1∶1).The structure of the product was identified by IR,NMR spectrum and elemental analysis.Results and Conclusion After highly selective introduced two - SO 3 groups at C3′and C6of the substrate,the new water-soluble apigenin sulfonated derivative,sodium 5,7,4 '-trihydroxyflavone-6,3′-sulfonate was obtained in good yield(78%) at moderate conditions.This method is an ideal synthesis way because of its simple operation,mild reaction conditions,high selectivity,easy separation of the product and higher yield.
