Dianiline conjugated Schiff base molecule: Electrical and electrochemical properties

摘要

Schiff bases are small molecules possessing -C=N- functional groups which are exploited for coordinating inorganic cations to form stable complexes which play the critical role in catalysis. Here we synthesized a new Schiff base molecule (SBM) by condensation of terephthalaldehyde and conjugated dianiline to study its electrical and electrochemical properties. This Schiff base molecule (SBM) can be oxidized with ammonium peroxodisulfate in presence of 1 M HCl solution into emeraldine base form (O-SBM). Interestingly, the O-SBM molecule exhibits electrical conductivity after doping. The structure of the synthesized products (SBM and O-SBM) were characterized by Fourier-transform infrared (FT-IR) spectra, H-1 NMR, ESI-MASS, elemental analysis, UV-vis, and fluorescence spectral techniques. The oxidized state (O-SBM) is dopable with 1 M HCl, to give better electrically conducting material than few oligoanilines such as trianiline, tetraaniline and pentaaniline. The electrical conductivity of O-SBM is 4.5 x 10(-2) S/cm at room temperature. The redox behavior of SBM and O-SBM is investigated by cyclic voltammetry.