Abstract
Inelastic electron tunnelling spectroscopy (IETS) has been applied to study the adsorption of a series of aminophenols on plasma-grown aluminium and magnesium oxides. Vapour-phase doping of these surfaces was used and spectra recorded for 1,2-aminophenol, 1,3-aminophenol and 1,4-aminophenol. The tunnel spectra of the 1,2- and 1,3-aminophenols show that their chemisorption at both oxide surfaces is via reaction between phenolic and surface hydroxyl groups. For the 1,4-aminophenol example, adsorbate chemisorption involves transfer of surface-bound protons from the oxide in amino-group protonation. Some of these protons are replaced by deprotonation of the phenol at surface oxide ions. Observed band intensities for all three systems on aluminium oxide are held to be indicative of an adsorbate orientation on the surface which is close to the vertical. In contrast, those for magnesium oxide are more consistent with a non-vertical configuration.
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