title: In-situ spectroelectrochemical evidences for the copolymerization of o-toluidine with diphenylamine-4-sulphonic acid by UV-visible spectroscopy.
abstract: In-situ spectroelectrochemical studies on the copolymerization of o-toluidine (OT) with diphenylamine-4-sulfonic acid (DPASA) were carried out on ITO electrode in 0.5 M H2SO4 for different feed ratios of OT and DPASA. The early stages of copolymerization of OT with DPASA have been identified through spectroelectrochemical techniques. The results revealed the formation of a head-to-tail dimer type of intermediate at the initial stages of copolymerization. This N-phenyl-paraphenylene diamine (PPD) type of intermediate was assigned to have a peak at 550 nm in UV-visible spectra and confirmed via derivative cyclic voltabsorptogram (DCVA). Constant potential electropolymerization results also supported the formation of intermediate with an absorption maximum at 550 nm.
authors.affiliation: Chemical Engineering Department, National Cheng Kung University, Tainan, Taiwan, ROC. tcwen@mail.ncku.edu.tw
authors.forename: Ten-Chin
authors.initials: TC
authors.lastname: Wen
authors.forename: C
authors.initials: C
authors.lastname: Sivakumar
authors.forename: A
authors.initials: A
authors.lastname: Gopalan
mesh_terms: D019281:Dimerization; D004159:Diphenylamine / Q000737:chemistry*; D004563:Electrochemistry; D008956:Models, Chemical; D013053:Spectrophotometry / Q000379:methods*; D013451:Sulfonic Acids / Q000737:chemistry*; D014052:Toluidines / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D013451:Sulfonic Acids; D014052:Toluidines; D004159:Diphenylamine; C023622:2-toluidine