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Schiff bases containing N, S donor atoms and their metal complexes have received considerable attention owing to their potent biological activity as anti-fungals, anti-virals, anti-malarials, and most notably, as anti-tumor agents. For example, thiosemicarbazones (tsc) show a wide range of biological properties depending on the parent aldehyde or ketone; if these are heterocyclic aromatic system, their nature seems to enhance their activity. Tsc usually bind to a metal ion as bidentate N,S-donor ligands, when a third donor site is incorporated into the ligands, like tsc of 2-acetylpyridine, normally N,N,S-tricoordination takes place. The πdelocalization of charge and the configurational flexibility of their molecular chain can give rise to a great variety of coordination modes. In this work, the schiff base (acpymdtcH) derived from 2-acetylpyridene and S-methyldithiocarbazate was taken as trifunctional (N,N,S) monobasic ligand. This ligand shown in thione (I) and thiol (II) form is of important because their coordination mode.

Synthesis and Structural Studies of Mn(II), Co(III), and Ni(II) Complexes with Schiff Base Ligands Derived from 2-Acetylpyridine