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Metal complexes derived from the reaction of Cu(II), Co(II), Ni(II) and   Zn(II) acetates and (E)-4-(2-hydroxyphenylimino)pentan-2-one (H2L) have been   synthesized and characterized by elemental analyses, MS, IR, UV-Vis., 1H NMR,   thermal analyses (TGA and DTG) and magnetic measurements. In all complexes   except for Zn(II) complex, the Schiff base ligand acts as a mono-negative   tridentate (NOO) donor, through the azomethine nitrogen, the hydroxyl oxygen   and the enolic carbonyl oxygen. The structure of the Cu(II) complex is   square-planar, the Co(II) is octahedral while, the Ni(II) and Zn(II) are   tetrahedral. The optical band gap measurements indicated a semi-conducting   nature of these complexes. The biological activities have been screened   against two bacteria and two fungi. Some of the studied complexes showed   activity against bacteria and fungi

Spectral, thermal, optical and biological studies on (E)-4-[(2-hydroxyphenyl)imino]pentan-2-one and its complexes