Abstract
Two new thiosemicarbazone ligands {HL1 = 4‑(2‑chlorophenyl)‑1‑((pyridin‑2‑yl)methylene)thiosemicarbazide and HL2 = 4‑(2‑methoxyphenyl)‑1‑((pyridin‑2‑yl)methylene)thiosemicarbazide} were synthesized. With Mn2+, Ni2+ and Cu2+, the metal complexes [Mn(L1)2] 1, [Ni(L1)Cl] 2, [Cu(L1)Cl] 3, [Mn(L2)2] 4, [Ni(L2)Cl] 5 and [Cu(L2)Cl] 6 have been isolated and their structures were assigned based on their CHNS contents, magnetic moments, spectral (IR, UV–Vis) data and DMF solution molar conductivities. The complexes are of varied structures, spanning from octahedral manganese complexes to square planar nickel and copper complexes or even square pyramidal geometries and adopt different topologies, such as monomers or dimers. Further studies on complex 2 and 3 were performed; single crystals of 2 and 3 were grown and analyzed by XRD technique. Additionally the thermal degradation mechanism of 2 in nitrogen atmosphere has been studied, being observed the formation of nickel sulfide as a final product at temperature of around 700 °C. All ligands and complexes have been tested against fungal and bacterial cultures and, in many cases, the biological activity of the free ligands is enhanced upon coordination.
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