Synthesis and spectral characterisation of a new metal complex with a bidentate ligand

Abstract

Literature mentions the important biologic-active, antimalaric, antiviral, antitumoural, tuberculostatic properties of 3-alkyl-and 3-alkenyl-substituted derivatives of 2-hydroxy-1,4-naphthoquinone and arylamino-1,4-naphthoquinones; the same properties are shown by the complexes that these ligands form with metal ions, which act in the biological structures as essential microelement. This paper reports the study of the structure of some new electron-transfer complexes with bidentate ligands of the naphthoquinone series by using IR, visible and UV spectra. A quantum-mechanical interpretation of the electronic transitions for the free and coordinated ligand has been performed in order to get information on the coordination of the heteroatoms to the M(II). The complexes of transitional metals with naphthoquinonic ligand have been prepared by following the procedure described by Jensen and Nielsen. The structural formula of the free and coordinated organic ligand has been modelled on the computer. The electronic spectra of the complexes studied lead to the conclusion that they are square-planar. © 2009 IOP Publishing Ltd.