Synthesis, crystal structures and antibacterial activities of two Schiff base Zinc(II) complexes

Two new mononuclear Schiff base zinc(II) complexes, [ZnBr(2)L1] center dot CH3OH (1) and [ZnBr(2)L2] center dot H2O (2) (L1 = 1-[(2-ethylaminoethylimino) methyl] naphthalen-2-olate, L2 = 4 bromo-2-[(2=methylaminoethylimino)methyl] phenolate), have been obtained from a similar synthetic procedure. The complexes have been characterized by elemental analyses and single crystal X-ray determinations. In each of the complexes, the zinc(II) atom is four-coordinated by one imine N and one phenolate O atoms from a Schiff base ligand, and by two terminal Br atoms, forming a tetrahedral coordination. Except for the mononuclear zinc(II) complex moiety, complex 1 consists of a lattice MeOH molecule, while complex 2 consists of a lattice water molecule. Both of the lattice components in the complexes participate in the formation of hydrogen bonds. The Schiff base ligands and the two zinc(II) complexes showed potent antibacterial activities.