Thumbnail
Access Restriction
Open

Author Ohki, Akira ♦ Takenaka, Shigeori ♦ Tsukada, Kadzuya ♦ Maeda, Shigeru ♦ Takagi, Makoto
Source J-STAGE
Content type Text
Publisher The Japan Society for Analytical Chemistry
Language English
Subject Keyword Ion-pair extraction ♦ extracting solvent ♦ liquid crystal ♦ phase transition
Abstract By using a liquid crystal, 4-cyano-4′-hexylbiphenyl (abbreviated as CHB), as an extracting solvent, the following ion-pair extraction reaction was investigated: $(QClO_{4})_{o}+(Pi^{-})_{w}_??_(QPi)_{o}+(ClO_{4}^{-})_{w}$ $(Q^{+}:$ cationic species such as Crystal Violet $(CV^{+}),$ Methylene Blue $(MB^{+})$ and tetrabutylammonium $(TBA^{+});$ $Pi^{-}:$ picrate anion; subscripts o and w denote organic and aqueous phases, respectively). The above extraction equilibrium was confirmed to hold in the case of a liquid crystal (CHB) solvent as well as in an ordinary solvent (hexylbenzene/cyanobenzene 1:1 mixture for comparison; abbreviated as MIX). The dependence of the extraction constant on the temperature was investigated. Only in the $CV^{+}-CHB$ system, the extraction constant discontinuously changed around a phase transition temperature of CHB (29°C; nematic/liquid). When an MIX solvent was used, such a phenomenon was not observed; the extraction constant gradually increased with an increase in temperature. The effect of the molecular orientation of the extracting solvent is discussed.
ISSN 09106340
Learning Resource Type Article
Publisher Date 1990-04-10
e-ISSN 13482246
Journal Analytical Sciences(analsci1985)
Volume Number 6
Issue Number 2
Page Count 4
Starting Page 283
Ending Page 286


Open content in new tab

   Open content in new tab