Electrochemical preparation and in situ characterization of poly(3-methylpyrrole) and poly(3-methylpyrrole-cyclodextrin) films on gold electrodes

Abstract

Electrochemical preparation and in situ characterization of poly(3-methylpyrrole) and poly(3-methylpyrrole-cyclodextrin) films on gold electrodes Abstract: A Electrosynthesis of conducting poly(3-methylpyrrole) (P3MPy) and poly(3-methylpyr role-2,6-dimethyl-β-cyclodextrin) (poly(3MPy-β-DMCD)) films on a gold electrode in acetonitrile electrolyte solution containing lithium perchlorate has been carried out by potential cycling. Products were characterized with cyclic voltammetry CV, in situ UV-Vis spectroscopy, and in situ resistance measurements. Electrosynthesis of poly(3MPy-β-DMCD) started with a (1:1) (3MPy-β-DMCD) supramolecular cyclodextrin CD complex of 3-methylpyrrole characterized with proton NMR spectroscopy. The oxidation peak of poly(3MPy-β-DMCD) in CVs is shifted to more positive values than P3MPy. In situ resistance measurements show that the resistance of poly(3MPy-β-DMCD) is higher than of P3MPy by approximately an order of magnitude. Minimum resistance can be observed for P3MPy and poly(3MPy-β-DMCD) at 0.40 < E Ag/AgCl < 1.10 V and 0.60 < E Ag/AgCl < 1.10 V, respectively. The higher resistance of P3MPy compared with polypyrrole may result from the presence of the methyl group substituent resulting in a decreased conjugation length. When CD is present during synthesis, resistance is even higher. In situ UV-Vis spectroelectrochemical data for both films prepared potentiodynamically by cycling the potential in the range -0.20 < E Ag/AgCl < 1.10 V in acetonitrile electrolyte show major effects of CD presence during electrosynthesis.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

Oxidoreductase Catalyzed Polymerization of 3-Methylpyrrole

“…All the values are comparable to those achieved for poly(3-MP) samples previously synthesized electrochemically (8) and are typical for PPy samples containing beta substituents (9). However, the values remain one to two orders of magnitude lower than those observed for enzymatically synthesized unmodified PPy (6).…”

Characterization and electrochromic properties of poly(2,3,5,6-tetrafluoroaniline): Progress towards a transparent conducting polymer

“…The isosbestic point related to a simple two stage system is not present as the neutral polymer electronic transition is at lower wavelengths below 420 nm. The band-gap (-*) transition for aniline is generally observed around and sometimes below 300 nm which represents a limitation for electro-optical applications [24]. Compared to spectra of polyaniline, the range of wavelengths associated with the transition in PTFA is very wide, which is due to the presence of fluorine electron withdrawing group.…”

Electrochemical synthesis and in situ spectroelectrochemistry of conducting polymer nanocomposites. I. polyaniline/TiO2, polyaniline/ZnO, and polyaniline/TiO2+ZnO

“…The width of the absorption feature corresponds to the distribution of conjugation lengths in the polymer; a broad band is associated with a broad distribution. Conversely, a shift of the maximum absorption about λ = 830 nm for PAn/TiO 2 +ZnO toward shorter wavelengths about λ = 750 nm for PAn/TiO 2 and λ = 800 nm for PAn/ZnO may suggest a longer conjugation . The influence of addition of TiO 2 , ZnO, and TiO 2 + ZnO on the optical behavior of Pan is caused by the absorption and change of wavelengths (see Fig.…”