SYNTHESIS, X-RAY CRYSTAL STRUCTURES, AND ANTIBACTERIAL ACTIVITY OF ZINC(II) AND COPPER(II) COMPLEXES DERIVED FROM N,N′-BIS(5-METHYLSALICYLIDENE)-1,3-PROPANEDIAMINE

New phenolate and azide bridged tetranuclear zinc(II) complex [Zn 4 Br 2 L 2 (μ 1,1 -N 3 ) 2 ] ( 1 ) and new mononuclear copper(II) complex [CuL] ( 2 ), where L is the dianionic form of N , N ′-bis(5-methylsalicylidene)-1,3-propanediamine (H 2 L), are synthesized and characterized. The complexes are characterized by elemental analyses, IR, UV-Vis spectra, molar conductivity, and single crystal X-ray diffraction. X-ray analysis indicates that the Zn atoms in complex 1 are in tetrahedral and square pyramidal coordinations, and the Cu atom in complex 2 is in a tetrahedral distorted square planar coordination. In the crystal structures of the complexes, molecules are stacked through π⋯π interactions. The complexes are assayed for antibacterial activities against three gram-positive bacterial strains ( E. cloacae , E. cloacae , and St. faecalis ) and three gram-negative bacterial strains ( St. faecalis , P. aeruginosa , and E. cloacae ) by the MTT method.