Monatshefte fur Chemie p. 1101 - 1112 (1987)
Update date:2022-08-05
Topics:
El-Shetary, B. A.
Stefan, S. L.
Zidan, F. I.
El-Maraghy, S. B.
The relative stabilities of the metal derivatives of hydrazo pyrazolone dyes containing ortho-OCH3, -COOH, and -NO2 groups have been measured potentiometrically in 75percent (ν/ν) dioxane-water mixture at 30 degC and < 0.1 ionic strength.The stability constant of their 1:1 and 1:2 chelates with twelve trivalent lanthanide ions Ln(III) have also been determined.The effects of substituents on the hydrazo-moiety of the ligand on the equilibria are discussed.The affinity of different ligands for complexation with lanthanide ions reaches its highest value with ortho-carboxyphenylhydrazopyrazolone.The data were correlated and the results were used to explain the stabilization of such chelates by dative ?-bonding between Ln(III) and the ligand. - Keywords: 1-Phenyl-3-methyl-4-(x-phenylhydrazo)-5-pyrazolone ligands; Stabilty of lanthanide (III)
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