Abstract
13C NMR spectra have been obtained for several amines, notably pyridine, aniline, and some derivatives of these, adsorbed on SiO 2, Al 2O 3, and mixed SiO 2Al 2O 3. On SiO 2, only weak interactions with surface hydroxyl are observed. An anomalous case is N,N-diethylaniline which shows an unaccountably large C-2 chemical shift. On Al 2O 3, much stronger interactions are observed. There is no evidence, however, of large chemical shifts such as occur on protonation of the corresponding amines in aqueous acids. It is shown that the strong acid sites on Al 2O 3 are sterically hindered. On SiO 2Al 2O 3, chemical shifts due to protonation are observed. It is shown that 13C NMR can be used to estimate the concentration of surface proton acids.
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