title: Ion-pair extractions with 12-crown-4 and its analogues.
abstract: The complexing abilities of 12-crown-4 and its analogues have been investigated by using ion-pair extractions. A relationship exists between the type of substitution on the 12-crown-4 and the complexing ability and selectivity. Additionally, the selectivities vary according to the reagent concentrations. The compound 12-crown-4 can be used to complex sodium selectively in the presence of other alkali-metal ions. A method for determining serum sodium-ion concentrations has been developed.
authors.affiliation: Miami University, Department of Chemistry, Oxford, OH 45056, U.S.A.
authors.forename: G E
authors.initials: GE
authors.lastname: Pacey
authors.forename: Y P
authors.initials: YP
authors.lastname: Wu