Analysis of the infra-red spectra of adsorbed pyridine confirms earlier work using ammonia which showed that the rutile surface is Lewis acidic. There are two stereochemically distinct surface sites of which only one is sufficiently acidic to interact with pyridine vapour. Rutile does not exhibit Brønsted acidity in the presence of pyridine even after pretreatment with water vapour.
G. D. Parfitt, J. Ramsbotham and C. H. Rochester, Trans. Faraday Soc., 1971, 67, 1500 DOI: 10.1039/TF9716701500
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