Stability Constants and Thermodynamic Parameters of Binary and Ternary Complexes of Transition Metal Ions With 4 Amino-Picolinic Acid N-oxide and Some Amino Acids in Aqueous Medium

Shiva Raj, B. Krishna Rao, Kashi Ram and M. G. Ram Reddy

Department of Chemistry, Osmania University, Hyderabad-500 007 India.

ABSTRACT:

Formation constants of binary complexes of Cu (II), Ni (II), Co (II) and Zn (II) and ternary complexes of Ni (II) with 4-amino picolinic acid N-oxide and L ( L= glycine, α-alanine , proline, hydroxyproline, phenylalanine and catechol) as secondary ligands have been determined potentiometrically at different temperatures and at constant ionicstrength. The effect of various ionic strengths at constant temperature on the stability constants of binary systems has also been studied. All these metal ions form 1:1 and 1: 2 binary complexes and 1: 1 : 1 ternary complexes with 4- amino picolinic acid N-oxide. Thermodynamic parameters ( G, H, S) of these complexes have been determined and discussed. The Stabilities of ternary complexes are compared with stabilities of binary complexes of secondary ligands and discussed.

KEYWORDS:

Thermodynamic; Transition; Amino

Download this article as: 

Copy the following to cite this article: Raj S, Rao B. K, Ram K, Reddy M. G. R. Stability Constants and Thermodynamic Parameters of Binary and Ternary Complexes of Transition Metal Ions With 4 Amino-Picolinic Acid N-oxide and Some Amino Acids in Aqueous Medium. Orient J Chem 1988;4(4).

Copy the following to cite this URL: Raj S, Rao B. K, Ram K, Reddy M. G. R. Stability Constants and Thermodynamic Parameters of Binary and Ternary Complexes of Transition Metal Ions With 4 Amino-Picolinic Acid N-oxide and Some Amino Acids in Aqueous Medium. Orient J Chem 1988;4(4). Available from: http://www.orientjchem.org/?p=42055