二硫代安替比林甲烷-硫氰酸盐-醋酸根体系萃取铑  

Extraction of Rhodium(Ⅲ) by Dithioantipyrylmethane-Thiocyanate-Acetate System

作　　者：陈淑群[1] 莫启武[1] 容庆新[1] 

机构地区：[1]中山大学化学系,广州510275

出　　处：《分析化学》1996年第6期630-634,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金

摘　　要：本文系统地研究了二硫代安替比林甲烷（DTPM）－SCN-－CH3COO-（Ac-）体系对Rh（Ⅲ）的萃取性能及萃取机理。实验表明，在pH4的HAc－NaAc介质中，Rh（Ⅲ）与DTPM、SCN-及Ac-在加热下所形成的混配络合物可被氯仿定量萃取。文中试验了萃取的最佳条件、萃取容量、反本条件以及共存离子对Rh（Ⅲ）萃取的影响；测定了萃合物中各组分的组成比为Rh：DTPM：SCN-：Ac-－＝1：2：2：1；用电子吸收光谱和红外光谱研究了萃取过程的机理和萃合物的结构。The extraction behaviour of Rh (Ⅲ)-Dithioantipyrylmethane (DTPM)-SCN--acetate (Ac- ) systcm and its extraction mechanism were investigated. Experiments showed that in HAc-NaAc solution of pH 4 and under heating, Rh(Ⅲ)-DTPM-SCN--Ac- formed as a quadri-component complex and was extracted quantitatively by chloroform. The optimal conditions of extration, the extraction capacity, back extraction and diverse ions effect was studied. The composition of the extracted species was determined as Rh (Ⅲ): DTPM: SCN-: Ac =1: 2: 2: 1. The extraction mechanism was studied using electronic spectra and infrared spectra.It showed that sulfur atoms in DTPM and'SCN- coordinated into the inner-sphere of Rh(Ⅲ) complex, and Ac as an outer-sphere coordination ion rendered the extracted species more hydrophobic and neutral in charge. A possible structure of the extrat ed species was proposed.

关 键 词：铑 硫氰酸盐 萃取 DTPM 

分 类 号：O614.822[理学—无机化学] O658.2[理学—化学]