摘要
用萃取化学方法对金(Ⅲ)在混合中性氧配体——磷酸三丁酯/二苯基亚砜(TBP/Ph_2SO)和TBP/三苯基膦氧(TBP/Ph_3PO)体系中的配位情况进行了研究。结果表明金没有与配体发生直接的配位作用,而是藉氢键方式与试剂形成两类配合物,其组成为[H_3O^+·2TBP·Ph_2SO·yH_2O]·AuCI_4^-·HCl和[H_3O^+·mTBP·nPh_3PO·yH_2O]·AuCl_^-(m=1或2,n=1或2,m+n=3).求算出相应配合物的表观生成常数logK=3.33,5.29和6.32.对配合物的形成机理及其结构亦进行了讨论.
Many ion-associated complexes of gold (Ⅲ) with oxo neutral ligands have been reported, but the complexes of gold (Ⅲ) with mixed oxo neutral ligand have not been researched in organic phase before. In this paper, TBP and two other oxo neutral ligands (Ph2SO and Ph3PO) were used to coordinate with gold in HC1. The possible formed compositions of the complexes and the relative reaction mechanisms were proposed by means of UV spectra and the method of extracting chemistry (slopes).It was found that in the complexes of Ph2SO and TBP with gold (Ⅲ) only one kind of complex existed. The complex contained one Ph2SO and two TBP molecules. The apparent formation constant of the complex was logK1=3.33. The interesting phenomena were that the complexes formed by ph3PO and TBP had two forms: H30+.mTBP.nph3PO.yH2,O. AuCl4-(m = l or 2;n = l or 2;m + n = 3). When m=2, the apparent formation constant was logK2 = 5.29; but when m = l, the apparent formation constant logK3 = 6.32.By the experiments, the structures of the complexes were suggested and the mechanism of the coordination reeactions was ion-associated one.
出处
《浙江大学学报（理学版）》
CAS
1988年第4期421-429,共9页
Journal of Zhejiang University（Science Edition）
基金
国家自然科学基金资助项目
关键词
金
中性含氧配体
配位反应
gold
mixed oxo neutral ligand
coordination reaction
