Determination of Stability Constant of Some Transition Metal Ions Chelates With Substituted Pyrazoles

R. G. Shinde, V. M. Raut And M. L. Narwade

Department of Chemistry, Government Vidarbha Institute of Science and Humanities, Amravati - 444 604 (India).

ABSTRACT:

The stability constants of the complexes of Cu (II), Co (II) and Ni (II) ions with 3-(3’-nitrophenyl)-4-(4-chlorobenzoyl)-5-(2-hydroxyphenyl) pyrazole (L1), 3-(4’-chlorophenyl)-4-(4""-chlorobenzoyl)-5-(2-hydroxyphenyl) pyrazole (L2), 3-(4’-methoxyphenyl)-4-benzoyl-5-(2-hydroxyphenyl) pyrazole (L3), 3-(4-bromophenyl)-4-furoyl-5-(2-hydroxyphenyl) pyrazole (L4) have been determined by the pH-metric method at 0.1M ionic strength at 28 ± 0.10C in 70% dioxane-water mixture. The data obtained were used to estimate the values of proton-ligand (pK) and metal-ligand (logK) stability constants. It is observed that Cu (II), Co (II) and Ni (II) metal ions form 1:1 and 1:2 complexes with all the ligands.

KEYWORDS:

Stability constants; Pyrazoles; metal chelates; dioxane-water

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Copy the following to cite this article: Shinde R. G, Raut V. M, Narwade M. L. Determination of Stability Constant of Some Transition Metal Ions Chelates With Substituted Pyrazoles. Orient J Chem 2010;26(2).

Copy the following to cite this URL: Shinde R. G, Raut V. M, Narwade M. L. Determination of Stability Constant of Some Transition Metal Ions Chelates With Substituted Pyrazoles. Orient J Chem 2010;26(2). Available from: http://www.orientjchem.org/?p=24138