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With a tridentate Schiff base ligand 2-bromo-N'-(2-hydroxy-5-methylbenzylidene)benzohydrazide (HL) and cobalt nitrate, a cobalt(II) compound [Co(L)2]NO3∙½H2O (1) was prepared and characterized by elemental analysis, IR spectroscopy and X-ray structure determination. The compound crystallizes in the monoclinic space group P21/c. Single crystal X-ray diffraction analysis reveals that the Co atom is coordinated by the NOO donor atoms of the Schiff base ligands, in an octahedral coordination. The compound show effective catalytic oxidation property on some olefins. In general, oxidation of the substrates gave the corresponding epoxides in over 80% yields for various styrene and 71% for cyclohexene.