Synthesis, Crystal Structures, and Antibacterial Activities of Schiff-Base Zinc(II) Complexes [ZnL1Cl2] and [ZnL2I2]·0.5CH3OH
摘要:
Reaction of N-methylpropane- 1,3-diamine with 3-bromo-5-chlorosalicylaldehyde and 3-ethoxysalicylaldehyde, respectively, in methanol, forms two new Schiff bases, 2-bromo-4-chloro-6-[(3-methylaminopropylimino) methyl] phenol (L-1) and 2-ethoxy-6-[(3-methylaminopropylimino) methyl] phenol (L-2). Two new halido-coordinated zinc(II) complexes, [(ZnLCl2)-Cl-1] ( 1) and [(ZnLI2)-I-2]center dot 0.5CH(3)OH ( 2), derived from the Schiff bases, have been prepared and characterized by single-crystal x-ray diffraction, Fourier-transform infrared (FT-IR), and elemental analysis. Complex ( 1) crystallizes in the monoclinic space group P21/c, with a = 17.0640(10) angstrom, b = 13.238(2) angstrom, c = 14.843(2) angstrom, beta = 100.888(3)degrees, V = 3292.6(7) angstrom(3), Z = 8. Complex (2) crystallizes in the monoclinic space group P2(1)/n, with a = 15.7238(5) angstrom, b = 14.6918(5) angstrom, c = 18.4250(6) angstrom, beta = 114.7590(10)degrees, V = 3865.1(2) angstrom(3), Z = 2. The Zn atom in each complex is coordinated by one imino N and one phenolic O atoms of a Schiff-base ligand, and by two halide atoms (Cl for 1, and I for 2), forming a tetrahedral geometry. The Schiff bases and the complexes were assayed for antibacterial activities.