Asian Journal of Research in Chemistry

Saritha Aduri ¹, Venkata Ramana Reddy ², B. Sireesha ¹

Affiliations
1 Department of Chemistry, Nizam College, OU, Hyderabad-500 001, IN
2 Department of Chemistry, Jawaharlal Nehru Technological University Hyderabad, Hyderabad-500 085, IN

Abstract

The formation and stability of Pyridoxal semicarbazone (PLSC) and Pyridoxal thiosemicarbazone (PLTSC) Schiff base ligand (L) complexes of Co(II), Ni(II), Cu(II) and Zn(II) have been investigated by Irving-Rossotti pH-metric titration technique, at 30 ± 1°C and an ionic strength of 0.1M KNO₃ in 70% v/v DMF-H₂O medium. The acid dissociation constants (pK_a) of the ligands and the stability constants of the metal complexes formed in solution were determined. The results indicate the formation of 1:1(ML) and 1:2(ML₂) complexes in solution. The order of stability of the metal complexes with respect to the metal ions follows the Irwing - william's natural order, Co(II), Ni(II), Cu(II) > Zn(II).

Keywords

Schiff Base, Transition Metals, pH Metry, Stability Constants.

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