Abstract
Zinc complexes of Schiff base ligands exhibit interesting properties which could be exploited for potential applications as catalysts and models for biochemical systems. In this study, we report of the synthesis of a new zinc Schiff base complex, bis(N’-(pyridine-3-carboxaldehyde) isonicotinoylhydrazone) zinc(II), which has been characterized by physico-chemical methods. The X-ray single crystal structure of the complex has also been determined. The Schiff base ligand is bonded to the metal in a monodentate manner, coordinating through the pyridine N-atom, as shown from spectral studies. The crystal structure shows the zinc atom bonded to two Schiff bases and four aqua ligands, with each Schiff base ligand coordinating through its pyridine N-atom forming a distorted octahedral ZnN2O4 complex. Two water molecules and two nitrate ions found in the crystal structure link the different monomers through hydrogen bonding to form a layered supramolecular structure.
Highlights
There is a substantial increase in the coordination chemistry of zinc due to its structural diversity
We report of the synthesis of a new zinc Schiff base complex, bis(N’-(pyridine-3-carboxaldehyde) isonicotinoylhydrazone) zinc(II), which has been characterized by physico-chemical methods
The crystal structure shows the zinc atom bonded to two Schiff bases and four aqua ligands, with each Schiff base ligand coordinating through its pyridine N-atom forming a distorted octahedral ZnN2O4 complex
Summary
There is a substantial increase in the coordination chemistry of zinc due to its structural diversity. Schiff bases are important as ligands because of their ease of preparation and their resemblance to natural biomolecules [8] [9] Their metal complexes have been studied extensively because of their attractive physico-chemical properties and structural diversity, which account for their wide range of applications in industry and biology [9]-[13]. The study of the structural chemistry of Schiff base ligands and their complexes is important in understanding the complex biological properties of these systems Such ligands have been used to construct various metal-organic frameworks including coordination polymers due to their capabilities to act as chelators or connectors using the imine linkage [9] [17]. We report here the synthesis, characterisation and X-ray single crystal structure of a zinc(II) complex of N’-(pyridine-3-carboxaldehyde)isonicotinoylhydrazone Schiff base ligand in which bonding to the zinc atom is through the N-atom of pyridine while the imine group remains unusually uncoordinated
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