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The stability constants of complexes of Mn++, Fe++, Co++, Ni++, Cu++, Zn++, Cd++ and UO ++2 with 5,7‐dichloro‐, 5,7‐dibromo‐ and 5,7‐dinitro‐8‐hydroxyquinoline and their corresponding N‐oxides have been determined in 75 + 25 v/v dioxan + water medium at 35°C in presence of 0.20 M sodium perchlorate by pH‐titration technique as given by IRVING and Rossotti. A possible explanation for the observed orders of the stability constants of the metal complex with the different ligands, and of the complexes of a particular ligand with different metal ions is also proposed.

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The formation of a greenish blue 1 :1 meta1:ligand chelate at pH 5-7 and a faint violet 1 :1:1 metal:ligand:hydroxyl chelate at pH > 10 has been observed in Cu(I1) complexes with bis-2-pyridylglycol and its 6,6'-dimethyl derivative using spectrophotometric, conductometric, and pH-metric methods.

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