Synthesis, characterization and biological activity of the complexes of manganese(III), cobalt(III), nickel(II), copper(II) and zinc(II) with salicylaldehyde thiobenzhydrazone

Abstract

A new ligand, salcylaldehyde thiobenzhydrazone (H₂STB) forms the adduct [Cu(H₂STB)₂]Cl₂ and the deprotonated complexes, [M(HSTB)₂] (M(II)=Ni, Cu or Zn), [Mn(HSTB)₃] and [Co(STB)(HSTB)], which have been characterized by elemental analyses, magnetic susceptibility measurement, IR, UV- Vis, NMR and FAB mass spectral data. Magnetic and electronic spectral studies suggest octahedral geometry for [Mn(HSTB)₃] and [Co(STB)(HSTB)] and square planar geometry for [M(HSTB)₂] (M(II)=Ni , Cu) and [Cu(H₂STB)₂]Cl₂. The antifungal and antibacterial activity of the ligand and the complexes have been screened against several fungi and bacteria.