|
Abstract:
|
Semicarbazones and their transition metal complexes have been
receiving considerable attention because of their biological relevance and
applications in the field of analysis and in the field of organic NLO materials.
Their structural diversity also attracted inorganic chemists. A good deal of
work has been reported on the synthesis and structural investigation of
semicarbazones and their complexes. This is due partially to their capability
of acting as multidentate, NO, NNO, ONO and ONNO donors with the
formation of either mono or bi or polynuclear complexes. Their chemistry and
pharmacological applications have been extensively investigated. Appreciable biological applications as well as diverse stereochemistry of their metal complexes prompted us to synthesize two new tridentate ONO donor N4-phenyl semicarbazones derived from 2-hydroxy-4-methoxyacetophenone and 2-hydroxy-4-methoxybenzophenone and their transition metal complexes. These ketones were selected since they can provide a further binding site from phenolic–OH and can thus increase the denticity. Introduction of heterocyclic bases like
1,10-phenanthroline, 2,2′-bipyridine, 4,4′-dimethyl- 2,2′-bipyridine and 4-picoline
and some pseudohalides like azide and thiocyanate ion can result in mixed ligand
metal chelates with different geometries in coordination compounds In the present study, oxovanadium(IV), manganese(II), cobalt (II/III), nickel(II), copper(II) and zinc(II) complexes of 2-hydroxy-4- methoxyacetophenone-N4-phenylsemicarbazone (H2ASC) and 2-hydroxy-4-
methoxybenzophenone-N4-phenylsemicarbazone (H2BSC) were synthesized
and characterized. |