环状亚砜衍生物α-十二烷-四氢噻吩亚砜的合成及其萃金机理研究

Synthesis of α-Dodecyl-Tetrahydrothiophene-O-Oxide and Studies on the Mechanism of Its Extraction of Gold

讨论了新奇的环状亚砜衍生物α-十二烷-四氢噻吩亚砜DTMSO的合成及其萃金机理,四氢塞吩亚砜TMSO与NaH作用生成中间体后用溴代十二烷处理生成DTMSO。萃取反应为放热反应,反应热为-15.3kJ·mol-1。DTMSO在低酸度盐酸溶液中以中性溶剂化机理萃金,萃合物组成为(HAuCl4).3DTMSO,DTMSO通过氧与金配位;高酸度条件下,以离子缔合机理萃金,DTMSO和AuCl4-发生内配位转变。

Novel cyclic sulfoxides derivatives, α-dodecyl-tetrahydrothiophene-o- oxide(DTMSO) was prepared by the alkylation of tetrahydrothiophene-o-oxide with dodecyl bromides. Extracting reaction is exothermic reaction, Δ H = - 15.3kJ · mol-1. The mechanism of extracting gold with DTMSO was investigated. The results indicated that the reaction is neutral solvent complexing extraction in lower acidity, in which the composition of extraction complex is (HAuCL4) · 3DTMSO, Au is coordinated with 0 atom in > S = 0 group; the reaction is acid association extraction in higher acidity.