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An EtOH solution of 4-bromobenzaldehyde and thiosemicarbazide in equimolar ratio forms the corresponding Schiff base, LH (1). The latter reacts with Mn(II), Cu(II), Ni(II) and Zn(II) ions in 2:1 ratio and forms the corresponding coordination compounds [MnL2(H2O)2] (2), [CuL2] (3)and [ML2] (4, M = Ni, Zn). The coordination compounds have been characterized on the basis of elemental analyses, molar conductance, spectral (IR, reflectance, 1H NMR, ESR) studies and magnetic susceptibility measurements. The molar conductivities show that all of the complexes are non-electrolytes. 1 acts as a monobasic bidentate NS donor ligand in 2–4 coordinating through its azomethine N and thione S atoms. A square-planar structure to 3, a tetrahedral structure to 4 and an octahedral structure to 2 are proposed. These complexes were also screened for anti-bacterial and anti-fungal activity. The complexes exhibited greater activity against some micro-organisms when compared to the ligand