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Complexing equilibria and redox potentials of the Ag(II)/Ag(I) system in the presence of 2,2′:6′,2″-terpyridine in water

Komplexibildungsgleichgewichte und Redoxpotentiale des Systems Ag(II)/Ag(I) in Gegenwart von 2,2′:6′,2″-Terpyridin in Wasser

  • Anorganische Und Physikalische Chemie
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Summary

The conditional protonation constants (μ=0.1) for 2,2′:6′,2″-terpyridine, logK 1=4.93, logK 2=3.69, were determined by thepH-metric method. The compositions of complexes of Ag2+ and Ag+ ions with 2,2′:6′,2″-terpyridine (tp) were studied and equilibria of the complex formation process were described. The values of conditional complex formation constants are as follows: for Ag(tp) +2 :logβ01=5.79, logβ02=9.68, for Ag(tp) 2+2 :logβ02=25.31, while the conditional constant of the Ag(tp)NO3 precipitate formation is:K SO=2.45·104. Using coulometric and chronovoltamperometric measurements, the redox systems being formed in the complex solutions of Ag(II) and Ag(I) were determined and described including their formal potentials.

Zusammenfassung

Mit Hilfe derpH-metrischen Methode wurden die konditionalen Protonationskonstanten (μ=0.1) von 2,2′:6′,2″-Terpyridin bestimmt: logK 1=4.93, logK 2=3.69. Es wurde auch die Zusammensetzung der Komplexe von Ag(II) und Ag(I) mit 2,2′:6′,2″-Terpyridin(tp) bestimmt sowie die Gleichgewichte der komplexbildung beschrieben. Die Werte der Konditionalkomplexbildungskonstanten sind: für Ag(tp) +2 :logβ01=5.79, logβ02=9.68, für Ag(tp) 2+2 :logβ02=25.31 und für das Löslichkeitsprodukt Ag(tp)NO3:K −1SO =4.08·10−5. Die in Komplexlösungen von Ag(II) und Ag(I) vorliegenden Redoxsysteme wurden mittels cyclischer Voltametrie und Coulometrie untersucht und die Formalpotentialwerte dieser Systeme in Wasser bestimmt.

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Authors and Affiliations

  1. Department of General and Inorganic Chemistry, University of Łódź, PL-90-136, Łódź, Poland

    Maksymilian Ignaczak, Andrzej Grzejdziak & Barbara Olejniczak

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  1. Maksymilian Ignaczak
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  2. Andrzej Grzejdziak
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  3. Barbara Olejniczak
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Ignaczak, M., Grzejdziak, A. & Olejniczak, B. Complexing equilibria and redox potentials of the Ag(II)/Ag(I) system in the presence of 2,2′:6′,2″-terpyridine in water. Monatsh Chem 120, 515–527 (1989). https://doi.org/10.1007/BF00810838

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