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The stability constants of the ternary Cu 2+  complexes containing 1,2-diaminobenzene and oxalate or salicylate have been calculated from potentiometric titration curves published by G. K. CHATURVEDI and J. P. TANDON (Z. Naturforsch. 23b, 303 [1968]; 25b, 26 [1970]). A comparison of the results with data of the literature reveals that the qualities of 1,2-diaminobenzene in ternary complexes correspond to those of ethylenediamine, while the qualities of both amines differ considerably from those of 2,2′-bipyridyl, which has a stability-enhancing effect.

Ternary Complexes in Solution, XX: Stability of the Mixed-Ligand Cu 2+ Complexes Formed with 1,2-Diaminobenzene and Oxalate or Salicylate