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Computerized potentiometric determination of stability constants of metal ion-crown complexes by the method of corresponding solutions

✍ Scribed by B. S. Grabarić; M. Tkalčec; V. Merzel; I. Filipović

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
538 KB
Volume
3
Category
Article
ISSN
1040-0397

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✦ Synopsis

Two computerized potentiometric methods have been used to determine the stability constants of Na+ , K', and NH: complexes with 18-crown-6 in methanol-water solutions (70% volume fraction of methanol) at 25.0 ? O.l"C, and at constant ionic strength I = 0.1 M, adjusted with tetrabutylammonium iodide (TBAI). One method assumes a single complex equilibrium, while the method of corresponding solutions assumes the presence of simultaneous multiequilibria. It has been shown using the second method that K + ion, even with 18-crown-6 ligand, can form both M L and sandwich-type ML, complexes, found so far only with smaller crown rings. The other two cations investigated form only ML complexes, as was confirmed by both methods.

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