N-Anilinoacetohydrazobenzoylacetone (H2L) and their manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes have been
synthesized and characterized by IR, electronic spectra, molar conductivities, thermal analyses and magnetic susceptibilities. Binuclear
complexes with molar ratios of M:L=2:1 are formed. IR spectra show that the ligand (H2L) coordinates to the metal ions in a tetradentate
manner with O2N2 donor sites in Mn(II), Co(II), Ni(II) and Zn(II) complexes while in the Cu(II) complexes the ligand coordinates as
bidentate via N and O donor atoms. The electronic absorption spectra and magnetic susceptibility measurements show that all the
complexes have octahedral structure. The copper(II) complexes shows higher antibacterial activity towards G+ bacteria (Bacillus subtilis )
than the ligand and other complexes while Mn(II) complex shows higher antifungal activity than the free ligand.
Key words: Schiff base; synthesis; IR; thermal analyses; biological activity.
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