Electroreduction of gold (III) diazonium [4-Br-C6H4N≡N]AuCl4 and [4-Br-2,6-Me2C6H2N≡N]AuCl4 complexes have been studied at a glassy carbon electrode in acetonitrile with [Bu4N]PF6 as a supporting electrolyte. Cyclic voltammetry studies of 1.0 mM solution of both salts showed one irreversible reduction peak at 0.040 V and 0.151 V vs. Ag/AgCl, KCl (satd.), respectively. The disappearance of the reduction peak for multi cyclic CV scans of [Br-4-C6H4N≡N]AuCl4 complex indicates the surface modification of the electrode with a blocking gold-aryl film. K3[Fe(CN)6]3-/4- electron transfer and sonication experiments in organic solvents and water showed an efficient grafting and robustness of the grafted film. Energy dispersive X- ray spectroscopy (EDS) study of the film obtained from the complex after ten CV scans on a glassy carbon electrode displayed the absence of gold in the film. Multi cyclic CV scans and K3[Fe(CN)6]3-/4 electron transfer experiments of the [4-Br-2,6-Me2C6H2N≡N]AuCl4 salt showed the glassy carbon electrode was not totally blocked with the gold-aryl film as the [Br-4-C6H4N≡N]AuCl4 complex. Energy dispersive X-ray spectroscopy (EDS) study of the film obtained after ten CV scans of the salt on a glassy carbon electrode showed the presence of gold in the film.

Electrochemical reductive grafting studies of diazonium gold(III) salts on glassy carbon electrodes

254th National Meeting (2017)

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