Journal :   Asian Journal of Research in Chemistry

Volume No. :   9

Issue No. :  12

Year :  2016

Pages :   626-628

ISSN Print :  0974-4169

ISSN Online :  0974-4150


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Formation and Stability of Co(II), Ni(II), Cu(II) and Zn(II) Complexes of Pyridoxal Semicarbazone and Pyridoxal Thiosemicarbazone in Solution



Address:   Saritha Aduri1, Ch. Venkata Ramana Reddy2*, B. Sireesha1
1Department of Chemistry, Nizam College, OU, Hyderabad-500 001, India.
2Department of Chemistry, Jawaharlal Nehru Technological University Hyderabad, Hyderabad-500 085, India.
*Corresponding Author
DOI No: 10.5958/0974-4150.2016.00085.7

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 ± 1ºC and an ionic strength of 0.1M KNO3 in 70% v/v DMF-H2O medium. The acid dissociation constants (pKa) 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.
Cite:
Saritha Aduri, Ch. Venkata Ramana Reddy, B. Sireesha. Formation and Stability of Co(II), Ni(II), Cu(II) and Zn(II) Complexes of Pyridoxal Semicarbazone and Pyridoxal Thiosemicarbazone in Solution. Asian J. Research Chem. 2016; 9(12): 626-628.
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