Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
Electrochemical reactions with protonations at equilibrium: Part XIII. Experimental study of the homogeneous electron exchange in quinone/dihydroquinone systems
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Construction of anthraquinone functional zinc phthalocyanine sensor platform for ultra-trace amount of water determination in tetrahydrofuran and N,N-Dimethylformamide
2022, Analytica Chimica ActaCitation Excerpt :However, the first oxidation and second reduction potentials (E(ox1) and E(red2), respectively) belonging to the Pc ring (AQ)4-ZnPc+ and (AQ•–)4-ZnPc–) maintained their potential values even at high water concentration. The shift observed for the reduction of AQ units on the Pc ring was attributed to the stabilization of the reduction products (AQ•–)4-ZnPc and (AQ2−)4-ZnPc- via the hydrogen bonding formed with the interaction of the reduced products and water in DMF as described for some quinone and naphthoquinone reduced species by different research groups [26,46–49]. The third reduction potential (E(red3)) was more shifted to positive side (0.24 V) than the first reduction potential E(red1) (0.0189 V) for the same quantity of water (1.65 M) in DMF because the further reduced anthraquinone moieties on the Pc ring which have extremely negative charge on the carbonyl oxygen effectively favor the formation of the hydrogen bonding with water.
Fast and complete electrochemical conversion of solutes contained in micro-volume water droplets
2018, Electrochemistry CommunicationsCitation Excerpt :Under our conditions (unbuffered aqueous solution), the HQ oxidation peak originally at 0.52 V/SCE shifted towards more positive potentials values while electrolysis proceeded. The complex electrochemistry of the hydroquinone/quinone redox couple is well documented [16,17], even in unbuffered solutions [18] but mechanistic considerations related to the pH dependence of hydroquinone electrooxidation were out of the scope of this work. Actually, HQ oxidation did not provide a linear relationship between the peak current and HQ concentration, while BQ displayed a stable and linear plateau-shaped reduction wave at − 0.48 V/SCE which allowed its concentration to be monitored by cyclic voltammetry (Fig. 2B and C).
Synthesis, spectral and electrochemical characterization of novel 2-(fluoroanilino)-1,4-naphthoquinones
2011, Journal of Fluorine ChemistryCitation Excerpt :Therefore, the studies on mechanisms of biological action, as well as the design and synthesis of novel compounds with more selective biological activities, require the understanding of the factors that modify the physicochemical properties of quinone systems. The biological importance of this kind of compounds has motivated an extensive research to evaluate the electrochemical behavior of a given quinone and hydroquinone system [11–20]. Many researchers studied the redox kinetics and mechanisms in protic and aprotic solvents [11–13].
The solution electrochemistry of tetrahydrobiopterin revisited
2009, Nitric Oxide - Biology and Chemistry