<b>Electrochemical synthesis and spectroscopic characterization of poly(N-phenylpyrrole) coatings in an organic medium on iron and platinum electrodes</b>

Abstract

The electrochemical synthesis of poly(N-phenylpyrrole) film was achieved on pretreated iron and platinum electrodes in acetonitrile solutions containing 0.1 M N-phenylpyrrole as the monomer and 0.1 M tetrabutylammonium trifluoromethane sulfonate (Bu4NCF3SO3) as the supporting-salt. The results showed that a surface treatment by 10 % aqueous nitric acid inhibits iron dissolution without preventing the N-phenylpyrrole oxidation. Very strongly adherent films were obtained at constant-potential, constant-current and cyclic voltammetry. XPS measurements, infrared (FT-IR) and electronic absorption (UV-vis) spectroscopies were used to characterize the iron and platinum-coated electrodes. Finally the anticorrosion properties of the PφP film were evidenced.

New synthesis routes, characterization, electrochemical and spectral properties of p-substituted N-phenylpyrroles. Substituent effects

“…[10][11][12][13][14] We also compared, whenever it is possible, the IR spectral data of the p-substituted N-phenylpyrroles with those that we previously reported for unsubstituted NPPY, the parent compound. 6,7 For all compounds under study, the bands observed within 3150-3100 cm -1 and those within 3000-3080 cm -1 can be assigned to the υ=C-H stretching vibrations (harmonic) of the pyrrole and phenyl rings, respectively, in agreement with the attribution of bands appearing in the same spectral region for NPPY (Tables 2 and 3). In the case of 1, in addition to these bands, a wide band, located at 3426 cm -1 , was attributed to the υO-H stretching vibration, which confirmed the presence of a hydroxyl group in the phenyl ring, and therefore the formation of the title compound.…”

“…For this reason, a number of publications have been devoted to a study of the effect of the phenyl group on the properties of the corresponding polymer [poly(NPPY)]. [4][5][6][7] For instance, Mangeney et al 4 have investigated the role of a conjugated link in poly(NPPY) between the polypyrrole backbone and the phenyl group. These authors showed that it was possible to obtain polymers with conjugated grafted groups, leading to a new class of materials in which the π-electron density of the active centre might be adjusted without synthesis.…”

“…Also, the redox switching reaction of conducting polymers was used to modulate the electronic properties of benzene nuclei grafted on the polypyrrole backbone. 5 Moreover, recently, Diaw et al 6,7 have optimized the experimental conditions to electrosynthesize poly-NPPY films in organic and micellar media, and have reported that the presence of traces of pyrrole, during the electropolymerization process, can improve several physicochemical properties of poly-NPPY films.…”

Synthesis and Electropolymerization of New Phenylene-Substituted Dipyrridyls: Electrochemical and Spectroscopic Characterization

“…In previous works, the authors studied the impact of the electrosynthesis environment and the electrocatalytic effect of pyrrole which has a lower oxidation potential on the Nphenylpyrrole (N-PhPy) [24][25][26][27][28] electropolymerization process. So, it turned out that the presence of small amounts of pyrrole and the optimization of the environment could lead to an improvement of the electrosynthesized poly(N-phenylpyrrole) physicochemical properties 26,27 . We showed that the use of micellar media for the electropolymerization of the N-phenylpyrrole Asian Journal of Chemistry; Vol.…”

“…26, No. 18 (2014), [5973][5974][5975][5976][5977][5978][5979][5980] could bring many advantages such as the decrease of the oxidation potential and the increase of the polymer solubility 27 . Nevertheless, we also revealed in these works some blockings related to the insolubility of poly(N-phenylpyrrole) films obtained in organic medium 26 and to problems of films overoxidation and degradation due to the use of perchloric acid in aqueous micellar medium 16 .…”