Abstract
We have investigated the adsorption behavior of 4-dimethylaminobenzoic acid (4-DMABA) on Ag and TiO 2 by virtue of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. 4-DMABA was found to chemisorb on silver as carboxylate, after deprotonation, with its two oxygen atoms bound symmetrically to the metal substrate. 4-DMABA was also very favorably adsorbed on TiO 2 but with two different adsorption schemes. Most of the adsorbate was present as 4-DMABA − with its carboxylate group being held via a bidentate coordination to Ti 4+ cations. The remaining adsorbate appeared to form a H-bond between the carbonyl group of 4-DMABA and the surface hydroxyl group of TiO 2. Temperature dependent DRIFT spectra dictated that 4-DMABA molecules were surprisingly more strongly bonded to TiO 2 than to Ag. This could be evidenced from the fact that the vibrational peaks of the adsorbed species were seen up to 600 K on TiO 2, while they became substantially weakened around 450 K on Ag. From a cyclic thermal treatment, certain structural change appeared to occur around 400 and 500 K on Ag and TiO 2, respectively.
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