Synthesis of 2,5-disubstituted thiadiazoles was accomplished via a conventional method as well as microwave irradiation method. These substituted thiadiazoles were diazotized and coupled with 2,4-pentanedione (AcAc), ethylcyanoacetate (ECA) and malanodinitrile (MN) to get dinucleating ligands. The ligands were isolated, characterized and condensed with Ni (II), Cu (II) and Ru(III) chlorides. These compounds were screened on HL-60 Human leukemia cell Line and U-937 Lymphoma cell lines for anticancer activities. The antimicrobial activity of the ligands and their complexes against bacteria and fungi was also investigated. The effect of metal on the ligand activity is discussed.