Abstract

STRUCTURAL AND BIOLOGICAL STUDIES OF SOME TRANSITION METAL COMPLEXES OF NITRO DERIVATIVE OF PHENYLAZO-ETHYLACETOACETATE

Dr. Harmeet Kaur Kohli* and Dr. A. Y. Desai

ABSTRACT

Nitro phenylazoethyl acetoacetate complexes of the type M(NO2-PAEA)n, where M is ZrO(IV), Th(IV), Zn(II) and Cd(II), n is the valency of the metal, and NO2-HPAEA is nitro phenylazoethyl acetoacetate, have been synthesized and characterized. Complexes were isolated in solid state and characterized from elemental analysis, magnetic studies, UV-visible, IR and NMR data. The elemental analysis confirms the assigned stoichiometries. The stereochemistries of the complexes were ascertained using magnetic studies, uv- visible diffusive reflectance, IR and 1H NMR. The present paper describes synthesis and characterization and biological studies of these complexes. The complexes are found to have striking structural features. In these complexes, the phenylazo group (C6H5N2) exhibits bidentate character and co-ordinates with the metal through the phenylazo and methylketo groups. Metal- Ligand ratio is found to be 1:2. ZrO(IV)complex is square pyramidal, Th(IV) has octahedral geometry whereas Zn(II) and Cd(II) are found to have tetrahedral geometry respectively.

Keywords: Nitrophenylazoethylacetoacetate, transition metal complexes of hydrazone, ?-diketone ligands, Coordination compounds of Zn(II),Cd(II), ZrO(IV) and Th(IV).