A new series of nickel(II) mixed ligand complexes of some disubstituted dithiocarbamates with ethylsalicylaldiminate have been synthesized and characterized. The complexes conform to the general formula, [Ni(EtSal)(R2dtc)] where EtSal = ethylsalicylaldiminate, R2 = dibenzyl (Bz2), di-iso-butyl (i-Bu2), di-n-butyl (n-Bu2), ethylbutyl (EtBu), methylbutyl (MeBu), methylphenyl (MePh), cyclo-hexylmethyl (c-HxMe), and dtc = dithiocarbamate. Infrared spectra and elemental analyses reveal bidentate coordination of the ligands to nickel(II) ion in 1:1:1 mole ratio. Room temperature magnetic moments and solid reflectance spectra data indicate diamagnetic complexes with four-coordinate square planar geometry. The complexes show moderate and selective activity toward some of the test microorganisms.