用MIBK萃取Rh(Ⅲ)的硫氰酸配合物

EXTRACTION OF THIOCYANATE COMPLEX OF RHODIUM ( Ⅲ ) WITH MIBK

研究了在盐酸介质中硫氰酸盐存在下Rh(Ⅲ)的萃取.Rh(Ⅲ)在0.5～1.0mol·L^(-1)盐酸介质中与1×10~3倍以上的硫氰酸盐于沸水浴中加热60min即可形成硫氰酸铑(Ⅲ)配合物.此配合物可在较宽酸度范围(0.5～4mol·L^(-1)盐酸)被MIBK(甲基异丁基酮)定量萃取.通过吸收光谱试验证实有[Rh(SCN)_xCl_(6-x)]^(3-)(x>3)配合物生成.与质子化的MIBK生成(钅羊)盐而被萃取.

Rhodium(Ⅲ) reacts with more than 1000 fold of thiocyanate ions and forms Rhodium(Ⅲ)-thio-cyanate complex at 0. 5-1. Omol · L^(-1) HC1 medium after heating in a boiling water bath for 60 minutes. The com-plex can be extracted quantitatively at a wide range of acidity (0. 5-4. 0mol · L^(-1) HCI) with MIBK. The absorp-tion spectra shows that a mixed ligand complex [Rh(SCN)_xCl_(6-x)]^(3-) (x>3) is formed in the HC1-KSCN solution and an oxonium salt is formed and extracted with MIBK.