title: The ion-pair formation between dodecylsulfate and ammine-complexes of copper(II), nickel(II), zinc(II), palladium(II) and platinum(II), and the extraction behavior of the ammine-complexes by using sodium dodecylsulfate.
abstract: A micellar solution of sodium dodecylsulfate (SDS) exhibits the property of being separated into two phases due to a temperature change or the addition of salts. The ammine-complexes of copper(II), nickel(II) and palladium(II) reacted with the dodecylsulfate anion to form the corresponding ion-pair, and were extracted into the SDS gel phase. The SDS plays the roles of a pairing-ion for the ammine-complexes and of an extraction medium. The ion-pair extraction mechanism was investigated; the extractability of metals was given by the function of the solubility products of the ion-pairs. This method was applied to the mutual separation of Ni(II)/Cu(II) and Pd(II)/Pt(II). The driving force for the extraction was an electrostatic interaction between the cationic complex and the surfactant anion. The use of the SDS gel as ion-exchanger is also expected.
authors.affiliation: Department of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nakai
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Murakami
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Shoji
authors.initials: S
authors.lastname: Tagashira