Surface functionalization with redox active molecule-based imidazolium via click chemistry

• Redox active molecule containing ionic liquid framework and propargyl group.
• Electrochemical grafting and click chemistry on ITO electrode.
• Immobilization of organic layer containing redox unit and ions within the film.
• Local 2D electron transfer by scanning electrochemical microscopy.

In this study, the redox active molecule N-ferrocenylmethyl-N-propargylimidazolium bromide was immobilized onto the surface of an electrode. The surface modification was performed by coupling the electrochemical reduction of the 4-azidophenyldiazonium generated in situ with a copper(I) catalyzed click chemistry reaction. Surface and electrochemical investigations suggest the attachment of a monolayer of redox active molecules containing an ionic liquid framework onto the electrode surface. Furthermore, scanning electrochemical microscopy studies revealed the conductive behavior of the attached ferrocenyl moieties on the ITO surface.

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