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6854410 
Journal Article 
Stability constants and thermodynamics of complexation of Schiff base hydrazones derived from 3-hydrazino-6-phenylpyridazine and acetophenone derivatives 
Seleem, HS; Seleem, HS 
2003 
Yes 
Journal of the Indian Chemical Society
ISSN: 0019-4522 
80 
6 
622-625 
English 
WOS:000184208300002 
The acid-base equilibria and metal ion chelating tendency of 3-(acetophenonehydrazone)-6-phenylpyridazine (AHP) and its para-substituted derivatives (XAHP); X = NH2, Cl, OH, and OMe have been investigated potentiometrically in 75% (v/v) dioxane-water at 298 K and 0.1 M KNO3. For the same metal ion, the order of stability decreases, in the sequence: NH(2)AHP > OHAHP > OMeAHP > ClAHP, which is the same order of decreasing the electron-repelling property of the substituent (X) and consequently the basicity of the ligands. The thermodynamic parameters have been evaluated.< 
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