Add time:07/29/2019         Source:sciencedirect.com

Nanometer layers are grafted on the surface of carbon or metallic electrodes by electrochemical reduction of iodo or bromoacetonitrile in acetonitrile. The structure of these layers, (carbon or metal)–[CH2–CH(NH2)–]n, is determined by electrochemistry, ellipsometry and IRRAS. The bond between the surface and the organic layer is evidenced by ToF-SIMS. A mechanism is proposed to account for the formation of the layers: the grafting is assigned to the reaction of the cyanomethyl radical, CH2CN, with the electrode surface and the latter is partly reduced to the cyanomethyl anion −CH2CN that attacks the first grafted –CH2CN group, leading to the growth of the layer. It is also possible to produce the same radical by oxidation of the −CH2CN anion -obtained by deprotonation of acetonitrile-, but in this case only traces of grafting are detected on the electrode as the radical is trapped by the large excess of anions.

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