Abstract :
A Schiff-base of 1,8-diaminonaphthaline and 3-acetylthiophene was prepared and characterized by thin layer chromatography (TlC), IR, 1H-NMR, 13C-NMR and MS spectra.
The electropolymerization of the resulting Schiff-base (I) namely 1-(methylthiophenylidine)-8-naphthylamine (MTNA) on platinum and glassy carbon electrodes in DMF/ACN solution containing 0.1 M LiClO4 and 10−3 M of the Schiff-base (MTNA) was carried out by sweeping potential between −0.5 and 1.4 V at scan rate of 0.1 Vs−1. The prepared polymeric film has weak or poor redox response in non-aqueous and aqueous electrolytic solutions, but after immersing the polymeric film in 5 mM Ni(NO3)2/CH3CN for about 24 h, the resulting loaded polymer was tested in CH3CN/LiClO4 and 0.1 M H2SO4. A well defined redox response was obtained in both solutions and exhibit a thin layer behaviour. The loaded poly-MTNA modified electrode behaved as an electrocatalyst for the electrode reaction of hydroquinone and catecol. The electrodes are stable chemically and electro-chemically both in aqueous solutions and in mixtures containing methanol, making them excellent candidates for sensing and/or electrocatalytic applications.
