Summary
The electroeduction of Zn(II) ions in 1M NaClO4 in the presence of thiolactams has been studied by means of the faradaic impedance method in wide frequency ranges. The standard rate constants are found to be a linear function of the surface excesses of thiolactams. Catalytic activity of thiolactams increases in the following order: thiopyrrolidone, thiopiperidinone, thiocaprolactam; the enthalpies of activation decrease in this order. The differences in the catalytic activity of thiolactams result mainly from the double layer effect.
Zusammenfassung
Die Elektroeduktion von Zn(II)-Ionen in 1M NaClO4 in Gegenwart von Thiolactamen wurde mittels derFaradayschen Impedanzmethode über große Frequenzbereiche untersucht. Die Standardgeschwindigkeitskonstanten sind eine lineare Funktion der Überschußoberfläche der Thiolactame. Deren katalytische Aktivität steigt in der Reihenfolge Thiopyrrolidon — Thiopiperidinon — Thiocaprolactam; die Aktivierungsenthalpien sinken in der angegebenen Reihenfolge. Die Unterschiede in der katalytischen Aktivität der Thiolactame sind hauptsächlich auf den Doppelschichteffekt zurückzuführen.
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Dalmata, G. On the catalytic effect of thiolactams on the electrochemical reduction of Zn(II) ions. Monatsh Chem 126, 1195–1201 (1995). https://doi.org/10.1007/BF00824297
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DOI: https://doi.org/10.1007/BF00824297