Electrochemical and structural properties of self-assembled monolayers of 2-methyl-3-(ω-mercaptoalkyl)-1,4-naphthoquinones on gold

Electrochemical investigations of dissolved and surface immobilised 2-amino-1,4-naphthoquinones in aqueous solutions

“…Taking n = 2 and a = 0.5, which is reasonable in view of the symmetry of the Laviron plot (see below), a value of k s = 2.0 Â 10 2 s À1 is calculated. This value is higher, by at least one order of magnitude, than those reported for other self-assembled monolayers of naphthoquinones [18,20,23,24,26,27]. A direct comparison is however difficult because the electron transfer rate is influenced by many parameters including the quinone structure, the pH, the chemical structure of the bridge between the electrode and the redox group, and the fabrication of the self-assembled monolayer.…”

“…Other 2-amino-1,4-naphthoquinones, dissolved in solution, are used as reference systems to help interpret the voltammetric response of the immobilised naphthoquinone (NQ). A few reports have already been devoted to the synthesis, self-assembly and electrochemical characterisation of NQ derivatives immobilised on gold electrodes [18,[20][21][22][23][24][25][26][27]. Naphthoquinone occurs naturally as the core structure of the vitamin K family, involved in various biological processes.…”

Electrocatalytic reduction of hydrogen peroxide at Prussian blue modified electrode: An in situ Raman spectroelectrochemical study

“…In order to reduce photo-and thermo-effects, and a possible degradation of Prussian blue film by the incident light as well, the cell holder was moved periodically with respect to the laser beam at ca. 15-25 mm/s with the help of custom built equipment [21,22].…”

Raman spectroelectrochemical study of Meldola blue, adsorbed and electropolymerized at a gold electrode

“…In order to reduce photo-and thermoeffects, and a possible degradation of adsorbate or polymer film by the incident light as well, the cell holder was moved periodically with respect to the laser beam at ca. 15-25 mm/s with the help of custom-built equipment [36,37]. Exact band frequencies were obtained by dividing the experimental spectra into the several spectral regions and fitting the contours with the mixed Gaussian-Lorentzian form components by using the GRAMS/AI 8.0 (Thermo Electron Corp.) software.…”