Abstract: The complexes of some transition metals coordinated with Nand Satoms of Schiff bases have been show to be effective as anticancers. Of all them, the kind of bis- (thiosemicarbazone) copper ( Ⅱ) is the best one. The crystal and molecular structure of dibenzoyl-bis- (thiosemicarbazone) copper (Ⅱ) (CuL) has been determined. Its crystal data are triclinic, space group P1 a = 8.9491(7), b = 9.595(1), c= 10.882(1)Å; α = 99.42(1)°, β = 106.19(1)°, γ=92.43(1)°; Z=2, D= 1.582 g/cm³; R=0.025.Cu (Ⅱ) is coordinated by N₁₁, N₂₁, S₁, S₂ atoms of the ligand, giving rise to a distorted planar square coordination. It can be found from the bond angle data that there is some tension here. Probably the LFSEof Cu (Ⅱ) (d⁹) can make compensation for it. Two benzene rings are nearly normal to this planar section. The structure of Cu-KTShas been discribed as containing chains of coppeffr(Ⅱ) with axial Cu-Sbonding tendency, but there are no chains in the structure of CuLowing to the existence of benzene rings.Then, it would be helpful to the understanding of the biological function of these compounds for us whe ther CuLhas the anticancer activity like Cu-KTS.

Key words: Complex of Cu(Ⅱ), Crystal and molecular structure, Dibenzoyl-bis-(thiosemicarbazone)