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Electrochemical study of 18-crown-6-Tl+ complexes in binary solvent mixtures

Elektrochemische Untersuchung von 18-Krone-6-Tl+-Komplexen in binären Lösungsmittelgemischen

  • Organische Chemie Und Biochemie
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Summary

The formation constants,K S, of the 18-crown-6 complex with thallium(I) ion were studied by polarographic measurements in binary mixtures of acetonitrile, acetone, tetrahydrofuran, and dimethylsulfoxide with water, as a function of the solvent mole fraction. In all the cases, the variation of the stability constant can be described by the empirical relation logK S=a[(ε−1)/(2ε+1)]+b where ε stands for relative permittivity of a given mixture anda andb mark the regression coefficients. The values ofa calculated for four series of binary mixtures showed correlation with the Gutmann donor numbers of the neat organic solvents which form the mixture.

Zusammenfassung

Es wurden die KomplexbildungskonstantenK S von 18-Krone-6 mit Thallium(I)-Ionen mittels polarographischer Messungen in binären Mischungen von Acetonitril, Aceton, Tetrahydrofuran und Dimethylsulfoxid mit Wasser als Fuktion des Molenbruch an Solvens untersucht. In allen Fällen konnten die Änderung in den Stabilitätskonstanten mittels der empirischen Beziehung logK S=a[(ε−1)/(2ε+1)]+b beschrieben werden, wobei ε für relative Permeabilität einer gegebenen Mischung steht unda undb die Regressionskoeffizienten darstellen. Der Werta für vier Serien von binären Mischungen zeigte eine Korrelation mit den Gutmann Donorzahlen der reinen organischen Lösungsmittel aus denen die Mischung zusammengesetzt war.

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Authors and Affiliations

  1. Department of Chemistry, University of Warsaw, PL-02-093, Warszawa, Poland

    Ewa Lada, Xiubin Lei & Marek K. Kalinowski

Authors
  1. Ewa Lada
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  2. Xiubin Lei
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  3. Marek K. Kalinowski
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Additional information

Dedicated to Professor Dr. Victor Gutmann on the occasion of his 70th birthday

On leave from the Department of Chemistry, Jingzhou Teacher's College, Jingzhou, Hubei, China

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Lada, E., Lei, X. & Kalinowski, M.K. Electrochemical study of 18-crown-6-Tl+ complexes in binary solvent mixtures. Monatsh Chem 123, 425–433 (1992). https://doi.org/10.1007/BF00817598

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  • DOI: https://doi.org/10.1007/BF00817598

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