Methylviologen cation radiacal, its dimer and complex in various media

In situ regeneration of NADH via lipoamide dehydrogenase-catalyzed electron transfer reaction evidenced by spectroelectrochemistry

“…2 shows the results of spectroelectrochemical measurements performed in the presence of NAD (10.0 mM), MV (0.5 mM) and variable concentrations of LD, synchronized with the chronoamperometric measurement at E = -0.75V for 1260 s (21 scans). The characteristic UV-vis absorbance of NADH is centered at 340 nm, while the absorbance peak at 400 nm is attributable to MV radical, one of the reduced forms of MV [22]. Fig.…”

Photo- and thermo-chromism of a ruthenium(II) complex and viologen-containing polymer film

“…Absorbances at 611 and ca. 400 nm, corresponding to absorption maxima of the viologen radical, 16 increased upon light irradiation or heating as shown in Fig. 2.…”

Novel accumulation of photo-induced MV+˙ embedded in a TiO2 shell and discharge of electrons to a Pt electrode

“…During UV-irradiation, the UV-vis absorption spectra of MV + produced by electron transfer from TiO 2 display two maxima at l = 395 and 605 nm. 8 Fig. 3 shows that the concentration of photogenerated MV + (Fig.…”

“…In addition to the anodic process in eqn ( 2) and ( 3) with the working electrode modified by &@TiO 2 , some of the photogenerated electrons in eqn (1) transfer to MV 2+ (the redox potential is at À0.7 V vs. SCE) 8 and produces the radical cation (eqn ( 4)) when the working electrode is modified by MV 2+ @TiO 2 during UV irradiation.…”

“…Fig.3Time dependence of the relative MV + concentration of an aqueous dispersion of MV 2+ @TiO 2 (K) and of a mixed aqueous dispersion of &@TiO 2 /MV 2+ (') after UV-irradiation for 1 (K) and for 3 min (') using a filtered 500 W high-pressure mercury lamp. Concentration was measured based on absorbance of the radical cation at l = 395 nm 8. …”