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Polarographically active cobalt-1-nitroso-2-naphthol complex in aqueous tartrate solutions

Polarographisch aktiver Cobalt-1-nitroso-2-naphtholat-Komplex in wäßrigen Tartrat-Lösungen

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  • Metal Complexes
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Zusammenfassung

Bildung und Zusammensetzung der Cobaltkomplexe mit 1-Nitroso-2-naphthol (HL) in wäßrigen Tartratlösungen wurden mit Hilfe der Differential-Puls-Polarographie und der Spektralphotometrie untersucht. Der inerte Cobalt(III)-Komplex CoIIIL3, der in schwach sauren Medien gebildet wird, wird an der Quecksilbertropfenelektrode im Potentialbereich zwischen + 0,2 und −1,8V gegen die gesättigte KE nicht reduziert. Ein Reduktionspeak des labilen CoIIL2-Komplexes wurde in schwach alkalischen Medien beobachtet.

Summary

The formation and composition of cobalt complexes with 1-nitroso-2-naphthol (HL) in aqueous tartrate solutions were investigated by the differential pulsepolarographic and spectrophotometric techniques. The inert cobalt(III) complex CoIIIL3, which is formed in weakly acidic media, is not reduced at the dropping mercury electrode (DME) in the potential range between + 0.2 and −1.8 V vs. SCE. A reduction peak of the labile CoIIL2 complex is observed in weakly alkaline media.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Hokkaido University, 060, Sapporo, Japan

    T. Uchida & M. Sugawara

Authors
  1. T. Uchida
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  2. M. Sugawara
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Additional information

The authors thank Prof. F. Umland and Prof. Y. Umezawa for their helpful suggestions and comments.

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Uchida, T., Sugawara, M. Polarographically active cobalt-1-nitroso-2-naphthol complex in aqueous tartrate solutions. Z. Anal. Chem. 322, 470–473 (1985). https://doi.org/10.1007/BF00496213

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  • DOI: https://doi.org/10.1007/BF00496213

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