Silver Ion Selective Extraction with Dithiaza-, Tetrathiaza-, and Tetrathiadiazacrown Ether Derivatives
作者:Hidefumi Sakamoto、Junichi Ishikawa、Makoto Otomo
DOI:10.1246/bcsj.68.2831
日期:1995.10
Dithiazacrown, tetrathiazacrown, and two tetrathiadiazacrown ether derivatives, bearing a phenyl group on each nitrogen atom at the periphery, were synthesized, and the solvent extractions of some transition metal ions with these compounds were carried out using an H2O–1,2-dichloroethane system. All of the thiazacrown compounds employed exhibited Ag+ selectivity, and formed 1 : 1 : 1 complexes of Ag+ : ligand : laurate ion as a counter anion to be extracted into a 1,2-dichloroethane solution. The extractabilities (extraction constants, Kex) for Ag+ decreased in the order: 7,16-diphenyltetrathia-7,16-diaza-18-crown-6 (3) (log Kex = 1.18 ± 0.13) > 13-phenyltetrathia-13-aza-15-crown-5 (2) (0.75 ± 0.09) > 7-phenyldithia-7-aza-9-crown-3 (1) (−0.47 ± 0.06) > 13,16-diphenyltetrathia-13,16-diaza-18-crown-6 (4) (−0.62 ± 0.16).
合成了二硫氮杂冠醚、四硫氮杂冠醚以及两种四硫二氮杂冠醚衍生物,这些化合物在每一个氮原子外围都带有一个苯基。使用水-1,2-二氯乙烷系统,研究了这些化合物对某些过渡金属离子的萃取。所有这些硫氮杂冠醚化合物都对银离子有选择性,并且形成了银离子:配体:月桂酸离子1:1:1的络合物,作为被萃取到1,2-二氯乙烷溶液中的反离子。银离子的萃取能力(萃取常数,Kex)按以下顺序递减:7,16-二苯基四硫-7,16-二氮杂-18-冠-6(3)(log Kex = 1.18 ± 0.13)> 13-苯基四硫-13-氮杂-15-冠-5(2)(0.75 ± 0.09)> 7-苯基二硫-7-氮杂-9-冠-3(1)(−0.47 ± 0.06)> 13,16-二苯基四硫-13,16-二氮杂-18-冠-6(4)(−0.62 ± 0.16)。