Abstract
The adsorption of n-heptane, toluene and 1,4-dimethylbenzene vapours on to the surface of rutile has been studied by infrared spectroscopy. Surface hydroxyl groups were perturbed to a lesser extent by weak interactions with physically adsorbed n-heptane molecules than by stronger hydrogen-bonding interactions with the aromatic nuclei of toluene or 1,4-dimethylbenzene. Hydroxyl groups responsible for an infrared band at 3410 cm–1 in spectra of rutile were unaffected by the adsorption of hydrocarbons and are thought to be at sub-surface lattice sites. Two types of surface hydroxyl group were replaced by a chemisorbed oxidation product, possibly acetate anions, when rutile was exposed to 1,4-dimethylbenzene vapour.
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