Ternary Complexes in Solution, XXII: Comparison of the Stability of 2,2'-Bipyridyl-Cu2+-1,2-Diaminobenzene with some Related Mixed-Ligand Complexes

Authors

  • Helmit Sigel Institut für Anorganische Chemie Universität Basel, Spitalstraße 51 CH-4056 Basel (Schweiz)
  • Bernhard Prijs Institut für Anorganische Chemie Universität Basel, Spitalstraße 51 CH-4056 Basel (Schweiz)

DOI:

https://doi.org/10.2533/chimia.1975.134

Abstract

The stability of the mixed-ligand Cu2+ complexes containing 2,2'-bipyridyl (Bipy) and 1,2-diaminobenzene (Dab), o-aminophenolate (Ap) or pyrocatecholate (Pyr) is compared by determining the constants (I = 0.1, NaClO4; 25°) due to Cu(Bipy)2 + CuL  ⇄ 2 Cu(Bipy)L (log X) and Cu(Bipy) + CuL ⇄ Cu(Bipy)L + Cu (Δ log K). The discriminating qualities of Cu(Bipy)2+ are obvious: Cu(Bipy)(Dab)2+, log X = 1.06, Δ log K = -1.18; Cu(Bipy)(Ap)+, log X = 3.14, A log K = −0.31; and Cu(Bipy)(Pyr), log X = 6.15, Δ log K = + 0.43. This discriminating behavior of Cu2+-amine 1:1 complexes is observed only with tert. aromatic-heterocyclic but not with aliphatic amines.

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Published

1975-03-31

Issue

Vol. 29 No. 3 (1975): Forschung/Research

Section

Kurze Mitteilungen

License

Copyright (c) 1975 Helmit Sigel

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

[1]
H. Sigel, B. Prijs, Chimia 1975, 29, 134, DOI: 10.2533/chimia.1975.134.