The liquid–liquid extraction of various metal ions, especially of soft class b metal ions with a thiacrown compound, 1,4,7,10,13,16-hexathiacyclooctadecane (HTCO) using picrate ion (Pic−) was examined and compared with that of 1,4,8,11-tetrathiacyclotetradecane (TTCT). Although the extraction behavior of the class a, ab, and b metals with HTCO is fundamentally similar to that with TTCT, that of some metals belonging to class b metals with HTCO is different from that with TTCT. The extraction percentages of copper(II) and palladium(II) with HTCO are a few times larger than those with TTCT. Copper(I) and silver(I) are extracted with HTCO as the 1 : 1 complexes such as [Cu(htco)]+Pic− and [Ag(htco)]+Pic−, respectively, regardless of the relative concentration of the ligand to the metal. On the other hand, copper(I) and silver(I) complexes with TTCT are extracted with different compositions depending upon the relative concentration of the ligand to the metal.
对各种
金属离子的液-液萃取进行了研究,特别是使用
苦味酸盐离子(Pic−)对1,4,7,10,13,16-六
硫杂环
十八烷(HTCO)的软b类
金属离子进行萃取,并与
1,4,8,11-四硫杂环十四烷(
TTCT)的萃取进行了比较。虽然a类、ab类和b类
金属与HTCO的萃取行为与与
TTCT的萃取行为基本相似,但属于b类
金属的某些
金属与HTCO的萃取行为与与
TTCT的萃取行为不同。HTCO萃取
铜(II)和
钯(II)的百分比比
TTCT高几倍。
铜(I)和
银(I)与HTCO以1:1的复合物形式被萃取,如[Cu(htco)] + Pic−和[Ag(htco)] + Pic−,与
配体与
金属的相对浓度无关。另一方面,
铜(I)和
银(I)与
TTCT的复合物根据
配体与
金属的相对浓度以不同的成分被萃取。