摘要:
Ni(II), Co(II) and Co(III) complexes of imidazole- and pyrrole-2-carbaldehyde thiosemicarbazone ligands (H2L1 and H2L2, respectively) have been prepared. The X-ray crystal structures of [Co(L-1)(HL1)], [Ni(H2L1)(2)]Cl-2.3.5H(2)O and [Ni(HL2)(2)] have been solved. The Co(III) ion assumes a slightly distorted octahedral coordination geometry, involving both N2S binding domain of di- and monoanionic ligand molecules. Whereas in [Ni(HL2)(2)] the metal ion is tetracoordinated in a square planar geometry by two pyrrole-2-carbaldehyde thiosemicarbazone molecules acting as NS-donor, the spatial array of non deprotonated H2L1 ligand molecules in [Ni(H2L1)(2)]Cl-2.3.5H(2)O is equivalent to that found for [Co(L-1)(HL1)]. The in vitro antimicrobial properties of the ligands and their complexes were tested against representative bacterial and fungal strains in broth culture. The compounds H2L2 and [Co(L-2)(HL2)(H2L2)].1.5H(2)O exhibit a moderate inhibitory effect on the microbial proliferation and only against some Gram positive bacteria. (C) 2004 Elsevier B.V. All rights reserved.