Abstract
In this publication, several six coordinate Co(III)-complexes are reported. The reaction of 2,3-butanedione monoxime with ethylenediamine or o-phenylenediamine in mole ratios of 2:1 gave the tetradentate imine-oxime ligands diaminoethane-N,N`-bis(2-butylidine-3-onedioxime) H2L1 and o-phenylenediamine-N,N`-bis(2-butylidine-3-onedioxime), respectively. The reaction of H2L1 and H2L2 with Co(NO3)2, and the amino acid co-ligands (glycine or serine) resulted in the formation of the required complexes. Upon complex formation, the ligands behave as a neutral tetradantate species, while the amino acid co-ligand acts as a monobasic species. The mode of bonding and overall geometry of the complexes were determined through physico-chemical and spectroscopic methods. These studies revealed octahedral geometry about Co(III) complexes in which the co-ligands bound through the amine and the carboxylate groups. Molecular structure for the complexes have been optimised by CS Chem 3D Ultra Molecular Modelling and Analysis Program and supported six coordinate geometry.
Highlights
The coordination chemistry of metal complexes of α-dioxime has been investigated widely [1]
Schiff-base oxime species based on transition metal compounds and polydentate ligands has been the subject of extensive research due to their potential applications in materials science [3, 4] and environmental chemistry and medicine [2] and biomimetic model including the preparation and molecular structure of Co(III)-complexes called cobaloxime
As part of our continuing efforts to explore the use of mixed ligands based on the multidentate Schiff-base oxime ligands and amino acid coligands, we describe here the formation and the spectral investigations of Co(III)-complexes with the mixed ligands; the amino acids and the tetradentate imin-oxime ligands diaminoethane-N,N-bis(2butylidine-3-onedioxime) H2L1 and ophenylenediamine-N,N-bis(2butylidine-3-onedioxime) H2L2
Summary
The coordination chemistry of metal complexes of α-dioxime has been investigated widely [1]. Approaches such as synthetic routes to obtain vicinal imine-oxime complexes and analytical and structural applications of these oxime species have been reviewed extensively [2]. Schiff-base oxime species based on transition metal compounds and polydentate ligands has been the subject of extensive research due to their potential applications in materials science [3, 4] and environmental chemistry and medicine [2] and biomimetic model including the preparation and molecular structure of Co(III)-complexes called cobaloxime [5, 6]. We reported the formation of phenoxo-bridged binuclear transition metal ions with the Schiffe-oxime ligand
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