Electrochemical copolymerization of aniline and anilinesulfonic acids in FSO₃H/acetonitrile solution

Abstract

ABSTRACT:The effects of 2-aminobenzenesulfonic acid (orthanilic acid), 3-aminobenzenesulfonic acid (metanilic acid), and 4-aminobenzenesulfonic acid (sulfanilic acid) on the electropreparation and properties of polyaniline (PANI) were investigated in acetonitrile containing 200 mM fluorosulfonic acid. The cyclic voltammetric studies of the products showed characteristics similar to those of conventional PANI in neutral solution, but there was a significant difference between the electrochemical behavior of the polymer films in basic solution. The sulfur-to-nitrogen ratios were found to be about 0.50, which indicated that copolymers were formed. The copolymers were soluble in a basic aqueous solution and in 1-methyl-2-pyrrolidinone and dimethyl sulfoxide solvents. The dry electrical conductivity values of the copolymers were measured. The structure and properties of these conducting copolymers in acetonitrile were elucidated with cyclic voltammetry, Fourier transform infrared spectroscopy, and ultravioletvisible absorption spectroscopy.

Potential dependent SERS profile of sulfanilic acid on silver electrode

“…22,23 The band at around 635 cm 1 is assigned as the C-S stretching vibrational mode. 10,24,25 CH bands are seen at 830 cm 1 in IR spectrum and at 821 and 803 cm 1 in the Raman spectrum as expected for 1-4 disubstituted aromatic compounds. 5 The relative intensities from SERS spectra are expected to differ significantly from normal Raman spectra owing to specific surface selection rules.…”

Electrochemical synthesis of sulfonated polypyrrole in FSO3H/acetonitrile solution

“…Cyclic voltammetric behavior of FSO 3 H/acetonitrile solution was investigated in our previous study 24, 26. The anodic limit of that solution was found to be +2.50 V versus Ag/AgCl.…”

Electrochemical preparation of poly(2‐bromoaniline) and poly(aniline‐co‐2‐bromoaniline) in acetonitrile

“…Introducing a -SO 3 H group on the PANI chain affects the properties of the parent PANI without substantially changing the conductivity and is of specific interest for several reasons such as solubility, environmental stability, and processibility. [12][13][14][15] Halogen-substituted PANIs, such as fluoro-substituted, 6,16 -19 chloro-substituted, 19 -22 and iodo-substituted, 23 have been synthesized and characterized. The polymers, which have electron-donating groups, are soluble in common organic solvents but exhibit lower electrical conductivity values (10 Ϫ3 -10 Ϫ1 S/cm) than those of unsubstituted PANI and the electrical conductivity of the copolymers is strongly dependent on the amount of substituted aniline incorporated.…”