Copolymer formation of 9-(2-(benzyloxy)ethyl)-9H-carbazole and 1-tosyl-1H-pyrrole coated on glassy carbon electrode and electrochemical impedance spectroscopy

Abstract

In this work, 9-(2-(benzyloxy)ethyl)-9H-carbazole (BzOCz)and1-tosyl-1H-pyrrole(TsP)monomerswerechem- ically synthesized and characterized by Fourier transform infrared reflectance (FTIR) and proton nuclear magnetic res- onance ( 1 H-NMR) spectroscopy. BzOCz and TsP were elec- trocoated on glassy carbon electrode (GCE) in various molar fractions (XTsP00.5, 0.83, 0.91, and 0.98) in 0.1 M sodium perchlorate/acetonitrile. The detailed characterization of poly (BzOCz-co-TsP) was studied by cyclic voltammetry, FTIR- attenuated total reflection spectroscopy and electrochemical impedance spectroscopy (EIS). The effects of different molar fractions during the preparation of modified electrodes were studied by EIS technique. The AC impedance technique was used to determine the capacitive behaviors of modified GCE via Nyquist, Bode magnitude, and Bode phase plots. The highest low frequency capacitance value was obtained as CLF023.94 μ Fc m −2 for XTsP00.98. Therefore, synthesized copolymer has more capacitive behavior than its homopoly- mers, such as CLF07.5 μ Fc m −2 for poly(BzOCz) and CLF0 9.44 μ Fc m −2 for poly(TsP). In order to interpret the AC