Studies on Vo (IV) Complex of Schiff base Ligand Derived from Ninhydrin Nd Semicarbazide
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Date
2010-06
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Addis Ababa Universty
Abstract
The catalytic and material properties of vanadium compounds and their effects in biological
systems have long provided the impetus and fuel to studies of vanadium science. The expanding
knowledge of the role of vanadium in biological systems and of the potential of vanadium
compounds as therapeutic agents has led continuously increasing interest in the coordination
chemistry and solution chemistry of this element. Vanadium complexes with mixed ligands
containing oxygen and nitrogen atoms are known to have high redox stability. In this context, the
ninhydrin-semicarbazone Schiff base ligand with nitrogen and oxygen coordinating atoms was
chosen for this study.The oxovanadium (IV) complex of the type [VO(DSCI] has been prepared using template
method of synthesis with Schiff base ligand derived by condensation of ninhydrin and
semicarbazide wherein the VO2+ cation acts as a template. Tentative structure of the complex has
been proposed on the basis of characterization by electrical conductance, magnetic moment and
electronic spectra. The oxovanadium (IV) complex is a five coordinated square-pyramidal
wherein the Schiff base ligand acts as a tetradentate ONNO donor coordinating via the
azomethine nitrogen atoms and enolized oxygen atoms of the amide group. The assignment of
the geometry is corroborated by magnetic moment and electrical conductance measurements.
Key Words: Oxovanadium (IV) complex, Schiff base, Ninhydrin, Semicarbazide, 1, 2-
disemicarbazone-indan-3-one.
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Keywords
Oxovanadium (IV) complex; Schiff base; Ninhydrin; Semicarbazide; 1; 2- disemicarbazone-indan-3-one.