SYNTHESIS, CRYSTAL STRUCTURES AND PRELIMINARY ANTIBACTERIAL ACTIVITIES OF NICKEL(II) AND ZINC(II) COMPLEXES DERIVED FROM 2-BROMO-6-[(3-CYCLOHEXYLAMINOPROPYLIMINO) METHYL]PHENOL

Two centrosymmetric mononuclear nickel(II) and zinc(II) complexes, [NiL2]center dot 2NO(3) (1) and [ZnL2(dca)(2)] (2), where L is the zwitterionic form of 2-bromo-6-[(3-cyclohexylaminopropylimino)methyl] phenol, and dca is the dicyanamide anion, have been synthesized. The complexes have been characterized by physicochemical methods and single crystal X-ray determination. Complex (1) crystallizes in the monoclinic space group P2(1)/n with unit cell dimensions a = 7.0091(7) angstrom, b = 11.137(1) angstrom, c = 23.997(2) angstrom, beta = 97.390(3)degrees, V = 1857.7(3) angstrom(3), Z = 2, R-1 = 0.0617, and wR(2) = 0.1632. Complex (2) crystallizes in the triclinic space group P-1 with unit cell dimensions a = 8.762(1) angstrom, b = 10.386(1) angstrom, c = 10.687(2) angstrom, alpha = 85.209(2)degrees, beta = 83.931(2)degrees, g = 88.734(2)degrees, V = 963.6(2) angstrom(3), Z = 1, R-1 = 0.0374, and wR(2) = 0.0873. The Ni atom in (1) is in a square planar geometry, and the Zn atom in (2) is in an octahedral geometry. The preliminary antibacterial activities of the complexes were assayed.