A new Zn(II) mononuclear complex with tris(benzimidazol-2-yl-methyl)amine (NTB) was synthesized with stoichiometry of [Zn(NTB)NO3]NO3·DIPY·DMF (DIPY∶4,4’-dipyridyl). The complex was characterized by elemental analysis, UV and IR spectra. The crystal structure was determined by using X-ray diffraction analysis. The crystal structure indicates that four N atoms and one O atom coordinate to zinc ion to construct a distorted trigonal-dipyramid configuration. Three nonprotonated N atoms from imidazole groups are in the equatorial plane, one alkylamino N atom and one O atom from 3NO- in the axial directions. The biological activity assay shows that this complex presents certain biological activity by means of pyrogallol autoxidation and it can be called a model compound of superoxide dismutase (SOD). A new Zn (II) mononuclear complex with tris (benzimidazol-2-yl-methyl) amine (NTB) was synthesized with stoichiometry of [Zn (NTB) NO3] NO3 · DIPY · DMF (DIPY: 4,4’-dipyridyl) The complex structure characterized by elemental analysis, UV and IR spectra. The crystal structure was determined by using X-ray diffraction analysis. The crystal structure was determined by using X-ray diffraction analysis. The crystal structure was determined by using X-ray diffraction analysis. configuration. Three nonprotonated N atoms from imidazole groups are in the equatorial plane, one alkylamino N atom and one O atom from 3NO- in the axial directions. The biological activity assay shows that this complex presents certain biological activity by means of pyrogallol autoxidation and it can be called a model compound of superoxide dismutase (SOD).