The Solvent Extraction of Bivalent Metal Picrates by 15-Crown-5, 18-Crown-6, and Dibenzo-18-crown-6
- 1 April 1979
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 52 (4) , 1027-1030
- https://doi.org/10.1246/bcsj.52.1027
Abstract
The overall extraction equilibrium constants (Kex) for the 1:1:2 complexes of 15-crown-5 (15C5), 18-crown-6 (18C6), and dibenzo-18-crown-6 (DB18C6) with several bivalent metal picrates between benzene and water have been determined at 25 °C. The Kex sequences of the bivalent metal ions with 15C5, 18C6, and DB18C6 are Pb2+>Sr2+>Ba2+>Ca2+, Pb2+>>Ba2+=Sr2+>Hg2+>Ca2+, and Pb2+>Hg2+>Sr2+>Ca2+ respectively. To clarify the role of the crown ether in the extraction process, the three constituent equilibria have been investigated: the stability and the extractability of the bivalent metal ion-crown ether complex, and the distribution coefficient of the crown ether. The extractability of the bivalent metal ion-crown ether complex about the same bivalent metal ion increases with increasing size of the crown ether, and appears to be dependent on the chemical nature of the bivalent metal ion trapped in the cavity of the crown ether.This publication has 10 references indexed in Scilit:
- Electronic substituent effects upon the selectivity of synthetic ionophoresJournal of the American Chemical Society, 1977
- Calorimetric titration study of the interaction of some uni- and bivalent cations with benzo-15-crown-5, 18-crown-6, dibenzo-24-crown-8, and dibenzo-27-crown-9 in methanol-water solvents, at 25.degree.C and .mu. = 0.1Journal of the American Chemical Society, 1976
- Calorimetric titration study of the interaction of several uni- and bivalent cations with 15-crown-5, 18-crown-6, and two isomers of dicyclohexo-18-crown-6 in aqueous solution at 25.degree.C and .mu. = 0.1Journal of the American Chemical Society, 1976
- Formation Constants of Dibenzo-18-crown-6 Complexes with Alkali Metal Ions in DMSO, DMF, and PC at 25°CBulletin of the Chemical Society of Japan, 1976
- Extraction selectivity of organic solutions of a cyclic polyether with respect to the alkali cationsJournal of Inorganic and Nuclear Chemistry, 1975
- The Extraction of Alkali Metal Picrates with Dibenzo-18-Crown-6Bulletin of the Chemical Society of Japan, 1975
- A Conductometric Study of Complexation of Macrocyclic Polyethers with Sodium SaltsIsrael Journal of Chemistry, 1973
- Salt complexes of cyclic polyethers. Distribution equilibriumsJournal of the American Chemical Society, 1971
- Calorimetric study of the interaction in aqueous solution of several uni- and bivalent metal ions with the cyclic polyether dicyclohexyl-18-crown-6 at 10,25, and 40.deg.Journal of the American Chemical Society, 1971
- Stability constants of cyclic polyether complexes with univalent cationsJournal of the American Chemical Society, 1971