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

• Published in: Synthetic metals Vol. 161; no. 15; pp. 1483 - 1495
• Main Authors: Diaw, A.K.D., Gningue-Sall, D., Aaron, J.J.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2011; Elsevier
• Subjects: Anodizing; Applied sciences; Current density; Electronics; Electropolymerization; Exact sciences and technology; Micellar media; Optical properties; Physicochemistry of polymers; Poly-N-phenylpyrrole; Polymerization; Polymers and radiations; Scanning electron microscopy; Sodium; Spectra; X-ray photoelectron spectroscopy; Poly-N-phenylpyrrole; Micellar media; Optical properties; Electropolymerization; Aromatic polymer; Fluorescence; Pyrrole derivative polymer; Aqueous electrolyte; Experimental study; Electrochemical polymerization; Absorption spectrum; Organic solution; Anionic surfactant; Conjugated polymer; Morphology; Preparation; Reaction mechanism; Micellar solution
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2011.04.007

Scheme of the proposed multiple-step mechanism of the poly(N-PhPy) film formation in acid aqueous micellar medium, showing the loss of a pyrrolyl group and the incorporation of one oxygen atom, in the case of a “modified” tetramer. [Display omitted] ► Electrosynthesis of poly-N-phenyl-pyrrole [poly(N-PhPy)] by anodic oxidation of N-PhPy on Pt. ► Acid aqueous micellar medium (0.1 M sodium dodecyl sulfate, SDS). ► Formation of electroactive poly(N-PhPy) films. ► Characterization of poly(N-PhPy) films (oligomers) by MALDI-TOF, FT-IR and XPS. ► Weak red-shifts of the poly(N-PhPy) UV–Vis absorption and fluorescence spectra maximums relative to N-PhPy. Poly-N-phenyl-pyrrole [poly(N-PhPy)] was electrosynthesized by anodic oxidation of N-PhPy on Pt electrode in acid aqueous micellar medium (0.1 M sodium dodecyl sulfate (SDS) + 1.93 M HClO 4 in 84/16 water/butanol v/v), using cyclic voltammetry (CV), chronoamperometry and chronopotentiometry. Electroactive poly(N-PhPy) films were formed upon scanning the potential ( E) between 0.0 and 1.4 V/SCE, under controlled potential ( E = 0.9–1.3 V/SCE) or controlled current density ( J = 0.125–2.0 mA/cm 2). The poly-NPhPy films were characterized by CV, MALDI-TOF mass spectrometry, FT-IR and X-ray photoelectron spectra (XPS), and their morphology was studied by scanning electron microscopy (SEM). Their optical properties, including electronic absorption and fluorescence spectra, were also investigated. A multiple-step mechanism for the poly(N-PhPy) films formation in micellar medium, based on the MALDI-TOF, FT-IR and XPS results, was proposed.