Usefulness of aqueous micellar media for electrosynthesis of poly(N-phenylpyrrole). Characterization and optical properties

International audienc

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

International audienc

New poly(p-substituted-N-phenylpyrrole)s. Electrosynthesis, electrochemical properties and characterization

International audienc

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

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 P&Phi;P film were evidenced

Use of electrosynthesized 4-amino-3-hydroxynaphthalene-1-sulfonic acid- doped polypyrrole for removal of Cr (VI) from aqueous solution.

International audienc

Reversible dimerization of anion radicals of carbonyl compounds and the electrosynthesis of pinacols. The case of 9-fluorenone

International audienceReversible dimerization of the anion radicals of carbonyl compounds was studied by cyclic voltammetry, chronoamperometry, electrolysis, digital simulation and quantum chemical calculations using electroreduction of 9-fluorenone in DMF/0.1 M Bu4NClO4 as an example. The experimental data confirmed that this reaction is thermodynamically unfavorable as it was predicted by DFT calculations. In contrast with some other anion radicals, neither ion pairing of 9-fluorenone anion radicals with lithium cation nor their hydrogen bonding with water shifts the dimerization equilibrium to the dimeric product. Reversibility of the dimerization decreases in the presence of phenol due to the protonation of the dimeric dianion and to the irreversibility of dimerization of the anion radical – phenol complexes. The contribution of these two pathways to general hydrodimerization process is discussed. © 2020 Elsevier Lt

The role of diazonium interface chemistry in the design of high performance polypyrrole-coated flexible ITO sensing electrodes.

International audienc

An experimental study of the electronic absorption and fluorescence spectral properties of new p-substituted-N-phenylpyrroles and their electrosynthesized polymers

International audienc

Tracking metal ions with polypyrrole thin films adhesively bonded to diazonium-modified flexible ITO electrodes.

International audienc

Crystal Structure and Optical Properties of N-Pyrrole End-Capped Thiophene/Phenyl Co-Oligomer: Strong H-type Excitonic Coupling and Emission Self-Waveguiding

International audienceIn view of their exploitation in working devices, mainly for their emission properties, the interest in crystals of thiophene/phenylene co-oligomers has recently increased. Here, we describe the strategies for the organic synthesis and crystal growth of a novel oligothiophene-based co-oligomer (thiophene/phenyl co-oligomer end-capped with pyrrole) designed to explore the effect of an electron-rich aromatic ring, such as pyrrole, to end-cap oligothiophenes. The growth by the melted material is also discussed and suggested for implementation in real devices. The UV−visible optical characterization is provided, and the results (absorption and emission excitonic transitions, H-type aggregation, self-waveguiding of the emitted light) are interpreted on the basis of the crystallographic data in the regime of strong intermolecular coupling