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The synthesis of a new mixed Schiff-base and DTCs ligands and its metal complexes are reported. Schiff-base was prepared by reaction of ((E)-2-amino-6-(pyridin-2-yl diazenyl)phenol) with 4-(dimethylamino)benzaldehyde). The complexes were prepared by mixing the (2-(((E)-4-(dimethylamino)benzylidene)amino)-6-((E)-pyridin-2-yldiazenyl)phenol) ligand (HL) and (potassium diphenylcarbamodithioate) ligand (L) with the metal salts; Cobalt(II), Nickel(II), Zinc(II) and Cadmium(II) in a 1:1:1 mole ratio. Physico-chemical techniques were implemented, as required, to characterise the ligands and complexes. These include; elemental microanalysis, Fourier Transform Infrared Spectra, Electronic spectra and 1H-Nuclear magnetic resonance spectroscopy, chloride content, magnetic susceptibility and conductance. Thermal stability (TGA-DSC) of the ligand and selected complexes were also investigated. These analyses revealed the isolation of six and four coordinate structures in the solid and solution sate. The antimicrobial activity of the ligand and its complexes against bacterial strains species was examined. [ABSTRACT FROM AUTHOR]

The study includes preparation and characterisation of mixed azo-linked Schiff-base ligands and their complexes. The starting material was isolated from the mixing of 2-amino pyridine diazonium salt with 2-amino-phenole and 4-amino-3-hydroxy-1-naphthalene sulfonic acid respectively in 1:1 mole ratio in water. In this work, the formation of azo-linked Schiffbase ligands are reported. Ligands of the azo-linked Schiff-base was achieved by the reaction of starting material with 4-(dimethylamino) benzaldehyde) (HL1 and HL2). The complexes were prepared by mixing the azo-linked Schiff-base ligands with the metal salts; CoII, NiII and CdII in a 1:1:1 mole ratio. Ligands and complexes were characterised by analytical and spectroscopic analyses including; microanalysis, chloride content, thermal analysis, magnetic susceptibility for complexes, conductance, FTIR, UV-Vis and 1H-NMR spectroscopy. Physico-chemical techniques indicated complexes demonstrated six coordinate structures in the solid and solution sate. Biological activity of the ligands and their metal complexes were screened for their antimicrobial activity against four bacterial species (Escherichia coli and Enterobacter (G-)), (Bacillus stubtilis and Staphylococcus aureus (G+)). [ABSTRACT FROM AUTHOR]