Electron transfer of quinone self-assembled monolayers on a gold electrode

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.…”

Electrochemical and Spectroelectrochemical Behaviors of Vitamin K1/Lipid Modified Electrodes and the Formation of Radical Anion in Aqueous Media

“…Of these, quinones are one of the most important and well-studied examples of organic redox couples. [5][6] They are well-represented examples of the electron transfer processes of the biological species in the photosynthetic reaction center and in mitochondrial ATP synthesis. 7 We have also studied the electrochemical behavior and anion radical detection of benzoquinone.…”

Surface Diluent Effect on the Heterogeneous Electron-transfer Kinetics of PQQ Self-assembled Monolayers

“…1.0 Å -1 per CH2 unit, different β values have been reported for different quinines. 9,16 The heterogeneous ET rate constant is greatly affected by the nature of bridging molecules. Conjugated bridges give higher ET rate constant compared to unconjugated systems.…”