Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Ion-pair Formation between Cd(II), Na(I), and Ag(I) Complex Ions with 18-Crown-6 Ether Derivatives and Various Pairing Anions in Water: an Understanding of the Ion-pair Formation Based on the HSAB Principle
Yoshihiro KUDOTsukasa KOIDEYujie ZHAOShoichi KATSUTAYasuyuki TAKEDA
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2011 Volume 27 Issue 12 Pages 1207

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Abstract

The ion-pair formation constants (KMLX0/mol−1 dm3) of CdL2+ with Br or NaL+ with N,N-diethyldithiocarbamate ion (DDTC) in water were determined potentiometrically at 25°C; ionic strength (I)→0: L denotes 18-crown-6 ether (18C6) and its mono-benzo derivative for the CdBr2-L system and 15-crown-5 ether and 18C6 for the NaDDTC-L one. The formation constant corresponding to the simple salt, NaDDTC, in water was also determined at I→0. Using the log KCdLX0 values of CdLCl+, CdLBr+, CdLPic+, and CdLSO4, then CdL2+ and picrate ion (Pic) in water have been classified with the hard and soft acids and bases principle, where the values were available in the literature, except for CdLBr+. The same classification was examined in NaX-L systems with X = DDTC, trifluoroacetate ion, MnO4, ReO4, Pic, and BPh4 and the AgPic-L one. Consequently, CdL2+, NaL+, and AgL+ were classified as the hard acids, while Pic and BPh4 as the hard bases. These results reflected the reactivities of the complex ions in ion-pair formation with X and SO42− in water.

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© 2011 by The Japan Society for Analytical Chemistry
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