Determination of stability constants of Pr(III) and Nd(III) chelates with some substituted pyrazoles

G. H. Murhekar*, A. R. Raut, M. P. Wadekar, V. W. Banewar and V. M. Raut

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

ABSTRACT:

The reaction of Pr(III) and Nd (III) metal ions with L1 : 3 (2’- chlorophenyl) - 4- benzoyl - 5 (2-hydroxy phenyl) pyrazole, L2: 3 (2’-chlorophencyl) - 4- pyridoyl -5 (2-hydroxy phenyl) pyrazole , L3: 3 (2’-aminophenyl)- 4-pyridoyl - 5 (2- hydroxyl phenyl) pyrazole and L4: 3 (4’-chlorophenyl) - 4- Benzoyl - 5 (2-hydroxy-phyenyl) pyrazole, have been studied pH-metrically at 0.1M ionic strength at 28 ± 0.10C in 70% ethanol -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 Pr(III) and Nd(III) metal ions formed 1:1 and 1:2 complexes with all the ligands.

KEYWORDS:

Substituted pyrazole; stability constants; chelates

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Copy the following to cite this article: Murhekar G. H, Raut A. R, Wadekar M. P, Banewar V. W, Raut V. M. Determination of stability constants of Pr(III) and Nd(III) chelates with some substituted pyrazoles. Orient J Chem 2009;25(4).

Copy the following to cite this URL: Murhekar G. H, Raut A. R, Wadekar M. P, Banewar V. W, Raut V. M. Determination of stability constants of Pr(III) and Nd(III) chelates with some substituted pyrazoles. Orient J Chem 2009;25(4). Available from: http://www.orientjchem.org/?p=22811