and its metalcomplexes have been synthesized and characterized. The ligand potassium 2-(2-phenylisonicotinoyl)hydrazinecarbodithioate [K+(H2L)−] (1) on reaction with transitionmetals in EtOH-H2O medium undergoes cyclization and converted to 5-(2-phenyl-4-pyridyl)-1,3,4-oxadiazole-2-thione (ppot), which yielded a series of mononuclear transitionmetalcomplexes. Four transitionmetalcomplexes of ligand