New mixed ligand Co(II) complexes: Synthesis, characterization and antimicrobial activity

A new complexes with general formula [Co2(X)2tpmc](BF4)2·Y (X= F-, Y=CH3CN; X= Br-, Y= H2O; tpmc = N,N',N'',N'''-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane), were isolated and their composition, some of physical and chemical properties and their tentative geometries were evaluated based on: elemental analysis (C, H, N), conductometric and magnetic measurements, spectroscopic data (UV/Vis, IR) respectively. Then, we compared synthesized complexes with early described chloro analogous. Both complexes are binuclear with proposed chair conformation of macrocycle. Complex compounds were also preliminary assayed in vitro toward some Gram (+) and Gram (-) bacteria, fungi and mould together with the starting material for the synthesis (ligands, simple salts and solvents) as test substances. In some cases certain antimicrobial activity of the complexes was detected. Minimal inhibitory concentration suppressing the visible growth of bacteria was determined. Both investigated complexes showed a moderate activity against strains of bacteria and were inactive against the tested fungi and mould. Under the same conditions and applied the same concentration of the control group did not show activity.