International Journal of Educational Research and Reviews

Full Length Research Paper

Preparation, characterization and kinetic study of metal complexes derived from N₅ acyclic ligand

Omar Hamad Shehab AL- Obaidi, Taghreed M.Musa, Mahmod N.Al-jibouri

*Chemistry department, Women Education College, Al-Anbar University, Iraq.

*Chemistry department, College of science, Al-Mustansrya University, Iraq.

*Corresponding author. E-mail: [email protected]

Accepted 15 July, 2013.

Abstract

The complexes of a new pentadentate acyclic ligand derived from 1,2-diamino benzene and 2,6-diacetylpyridine with vanadium(IV), Cr(III), Mn(II), Fe(III), Co(II), Ni(II), and Cu(II) have been synthesized. Metal to ligand ratio in all complexes has been found to be 1:1. The polydentate ligand behaves as N₅ system upon linkage with Cr (III), Fe (III), Mn(II), Co(II), and Cu(II) ions. All the complexes have been assigned octahedral stereo chemistry, while VO (IV) complex was square pyramid. The thermodynamic parameters such as ∆G*, ∆H* and ∆S* are calculated from the curve of logK_s verse temperature. It is found that Ni (Π) and Cu (II) are the most stable complexes from the data of formation constant and Gibbs free energy.

Key words: Preparation, characterization, kinetic study, metal complexes, acyclic ligand.