Citrate selectivity of poly(neutral red) electropolymerized films

Poly(neutral red): Electrosynthesis, Characterization, and Application as a Redox Mediator

“…The polymerization mechanism includes the formation of radicals, dimerization, and tetramerization of the monomers that then combine to give the polymer: the polymer is formed via C À N couplings. This mechanism has been confirmed by IR spectroscopy, in agreement with FT Raman and 1 H NMR spectroscopic studies, and demonstrates that the polymerization of NR occurs through the NH 2 groups of NR [22]. The possible structure of a tetramer is presented in Figure 3.…”

“…X-ray photoelectron spectroscopy (XPS) data proved that PNR deposited from sulfuric acid solution is SO 4 2À -doped and coupled with the protonated nitrogen of the polymer [18]. Fourier transform Raman spectra demonstrated that the PNR is a polycation where the positive charge is compensated by dopant anions [22]. Electron spin resonance (ESR) spectra of PNR supported the existence of radicals in the polymeric structures, and FTIR demonstrated the large changes in conjugation structure after NR electropolymerization [19].…”

“…It has been found that nitrate ions are very important for PNR formation since NO 3 À catalyzes the electropolymerization of NR and stabilizes the polymer formed [17, 21, 32 -34]. However, a PNR film can be successfully formed on a Pt substrate when SO 4 2À is used in strong acidic medium [18,20,22,35,36] as well as in Britton -Robinson buffer solution (pH 1.5) without any additional electrolyte salt [37]. X-ray photoelectron spectroscopy (XPS) data proved that PNR deposited from sulfuric acid solution is SO 4 2À -doped and coupled with the protonated nitrogen of the polymer [18].…”

Electrochemical Sensors

“…22 Consequently, the authors found that such electrodes showed remarkable selectivity to citrate over many other carboxylic anions, sufficient for successful citrate determinations in soft drinks.…”

Determination of Hydrogen Peroxide on Modified Glassy Carbon Electrode by Polytetrakis(2-aminophenyl)porphyrin Nanowire

“…[47][48][49][50][51][52][53][54] Voltammetry is very useful for the preparation of high quality nanowires in the multiporous AAO substrate, due to the control of electrochemical values. [55][56][57][58][59] In this study, the nanowires of polytetrakis(o-aminophenyl) porphyrin (PTAPPNW) were prepared by electrochemical polymerization with cyclic voltammetric method in AAO membranes. We studied the electrochemical properties of PTA-PPNW and its application to the determination of H2O2 by electrocatalytic reduction.…”