Synthesis, structure, and electrochemical properties of <i>N,Nʹ</i>-bis(ferrocenylmethylene)ethylenediamine Schiff base and its metal complexes

<p>The reaction of <i>N,N'</i>-bis(ferrocenylmethylene)ethylenediamine (<b>FcNN</b>) Schiff base with metal salts gave SnCl<sub>4</sub>FcNN (<b>1</b>), SnCl<sub>2</sub>FcNN(H<sub>2</sub>O)<sub>2</sub> (<b>2</b>), Sn<sub>2</sub>(CH<sub>3</sub>)<sub>4</sub>Cl<sub>4</sub>FcNN (<b>3</b>), Ti<sub>2</sub>Cl<sub>8</sub>FcNN (<b>4</b>), CdFcNN(NO<sub>3</sub>)<sub>2</sub> (<b>5</b>), and CuFcNN(NO<sub>3</sub>)<sub>2</sub> (<b>6</b>). New complexes (<b>1</b>)–(<b>6</b>) were characterized by IR and elemental analysis techniques. IR spectra showed that the Schiff base was coordinated to the metal ions in a bidentate manner with <i>N,N'</i> donor sites. The <sup>1</sup>H NMR spectra of complexes (<b>1</b>), (<b>2</b>), and (<b>4</b>) show all the expected signals with a typical signal pattern of disubstituted ferrocenyl groups. The electrochemical properties of complexes were determined by cyclic voltammetry. Cyclic voltammetry results show that these complexes exhibit one irreversible oxidation peak.</p>