Methimazole complexes of platinum(II): Synthesis, characterization and redox behavior

► Platinum complexes of methimazole (2-mercapto-1-ethylimidazole) coordinated in both thione and thiolate forms have been isolated and characterized. ► Molecular structure of [Pt(bipy)(HImS)2]Cl2 3H2O (3a 3H2O) has been established by single crystal X-ray crystallography. ► Platinum thiolate complex, [Pt(ImS)2(HImS)2] (5), yielded polynuclear platinum complexes which were studied by various techniques. ► The effect of diimine ligands on oxidation of methimazole moiety in the complexes has been studied by electrochemical oxidation and pulse radiolysis.