N,N′-Bis(triethoxysilylmethyl)thiocarbamide and Poly[N,N′-bis(silsesquioxanylmethyl)thiocarbamide S,S-dioxide]
作者:M. G. Voronkov、N. N. Vlasova、O. Yu. Grigor’eva、Yu. N. Pozhidaev、S. A. Bol’shakova
DOI:10.1007/s11176-005-0373-0
日期:2005.7
Condensation of (aminomethyl)triethoxysilane with thiocarbamide in the presence of catalytic amounts of ammonium sulfate was used to synthesize N,N-bis(triethoxysilylmethyl)thiocarbamide. The latter was brought into oxidative hydrolytic polycondensation with H2O2 to obtain poly[N,N′-bis(silsesquioxanylmethyl)thiocarbamide S, S-dioxide] whose properties were compared with the properties of poly[N,N′-bis(silsesquioxanylpropyl)thiocarbamide S,S-dioxide]. Both polymers in highly acidic media rather strongly absorb Ag(I), while at pH 7 they reduce most absorbed Ag+ to the metal. Their reaction with potassium permanganate involves reduction of Mn7+ to Mn4+. The first polymer is a less effective sorbent and redox agent than the second.
在大量硫酸铵催化下,用(氨甲基)三乙氧基硅烷与硫代甲酰胺缩合合成 N,N-双(三乙氧基硅甲基)硫代甲酰胺。将后者与 H2O2 进行氧化水解缩聚,得到聚[N,N′-双(硅烷氧基甲基)硫代碳酰胺 S,S-二氧化物],并将其性质与聚[N,N′-双(硅烷氧基丙基)硫代碳酰胺 S,S-二氧化物]的性质进行比较。在高酸性介质中,这两种聚合物都能强烈吸收 Ag(I),而在 pH 值为 7 时,它们能将吸收的大部分 Ag+ 还原成金属。它们与高锰酸钾的反应是将 Mn7+ 还原成 Mn4+。与第二种聚合物相比,第一种聚合物的吸附剂和氧化还原剂效果较差。