ISSN:
1436-5073
Keywords:
Mg2+ ionophore
;
bis-β-diketone
;
solvent polymeric membrane
;
ion-selective electrode
;
dissociation constant
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Lipophilic bis-β-diketones have been prepared by covalently linking twoβ-diketone subunits. Potentiometric studies on liquid membrane electrode cell assemblies showed no improvement of the ion selectivities induced by the bridged systems in comparison to unbridgedβ-diketones. The dissociation constants of the enol functions in the bis-β-diketones indicate that under the conditions of the EMF measurement probably only oneβ-diketone unit is deprotonated in the liquid membrane phase. The complexation of theseβ-diketones with Mg2+ and Ca2+ was studied by13C NMR-monitored titrations in a homogeneous organic phase.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01201711
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