Alkyl-Modified Gold Surfaces: Characterization of the Au−C Bond
Résumé
The surface of gold can be modified with alkyl groups through a radical crossover reaction involving alkyliodides or bromides in the presence of a sterically hindered diazonium salt. In this paper, we characterize the Au−C(alkyl) bond by surface-enhanced Raman spectroscopy (SERS); the corresponding peak appears at 387 cm −1 close to the value obtained by theoretical modeling. The Au−C(alkyl) bond energy is also calculated, it reaches −36.9 kcal mol −1 similar to that of an Au−S−alkyl bond but also of an Au−C(aryl) bond. In agreement with the similar energies of Au− C(alkyl) and Au−S−(alkyl), we demonstrate experimentally that these groups can be exchanged on the surface of gold.
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