Influence of Metal Ion Complexation on the Acid Dissociation of 4'-Carboxybenzo-24-Crown-8 in an Ethanol-Water Mixture

Influence of Metal Ion Complexation on the Acid Dissociation of 4'-Carboxybenzo-24-Crown-8 in an Ethanol-Water Mixture

A spectrophotometric method was used to determine the acidity constant of 4'-carboxybenzo-24-crown-8 in 52% (w/w) ethanol-water mixture. The acid dissociation constant, Ka, was found to increase in the presence of Na+, K+, Rb+, Cs+ and Tl+ ions. The formation constants of the resulting 1:1 comp...

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Veröffentlicht in:Iranian journal of chemistry & chemical engineering 1997-01, Vol.16 (2), p.59-62
Hauptverfasser: Ahmad Rouhollahi, Mohammad Reza Ganjali, Abolghasem Moghimi, Mojtaba Shamsipur
Format: Artikel
Sprache:eng
Schlagworte:
4'-carboxybenzo-24-crown-8
alkali and tl+ ions
complexation
ethanol-water mixture
spectrophotometry
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Zusammenfassung:A spectrophotometric method was used to determine the acidity constant of 4'-carboxybenzo-24-crown-8 in 52% (w/w) ethanol-water mixture. The acid dissociation constant, Ka, was found to increase in the presence of Na+, K+, Rb+, Cs+ and Tl+ ions. The formation constants of the resulting 1:1 complexes between the carboxycrown and the metal ions used were evaluated from the observed changes of Ka value with varying concentration of cations and found to vary in the order Rb+>Cs+>Tl+>K+>Na+.
ISSN:1021-9986
1021-9986