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Descrevem-se neste trabalho, a síntese e a caracterização de uma série de complexos hexaazamacrocíclicos com anéis de 14 e 16 membros, obtidos pela condensação de 1,2-diaminometano ou 1,3-diaminopropano, formaldeído e hidrato de hidrazina, na presença de sais de metais do primeiro período de transição. ]Cl 2 (where M = Co(II), Ni(II) and Zn(II)), were obtained. Elemental analyses, IR spectra, 1 H NMR, EPR, UV-Vis, magnetic susceptibility and conductivity measurements have ascertained the overall geometry and stereochemistry of the complexes. An octahedral geometry has been suggested for all the complexes, except for copper compounds, in which the metal centre coordinates to the four nitrogen atoms of macrocyclic ligand in a square planar fashion. These complexes were screened against different fungi and bacteria in vitro and were found to be potentially active in the concentration 5 mg mL -1 .

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