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Item Infra-red Studies of Carboxylic Acid Vapours Adsorbed on Evaporated Germanium Films(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (3), 1972) Howe, R. F.; Metcalfe, A.An experimental method has been developed for the observation of infra-red spectra of molecules adsorbed on germanium surfaces. The interactions of formic, acetic and propionic acids with germanium surfaces have been studied, and the observed spectra interpreted in terms of the formation of surface carboxylates.Item Infrared Spectra and Catalytic Activity of Supported Molybdenum Hexacarbonyl(Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (12), 1972) Howe, R. F.; Davidson, D. E.; Whan, D. A.Infrared spectroscopy has been used to study the olefin disproportionation catalysts consisting of molybdenum hexacarbonyl supported on silica, alumina and magnesia. Activation of the catalysts is found to cause decomposition of the molybdenum hexacarbonyl. Decomposition occurs most readily on a silica support which is not able to stabilize intermediate sub-carbonyl species. The intermediate sub-carbonyl species observed on alumina and magnesia supports arc not active centres for olefin disproportionation ; the active species is formed by complete loss of all six carbonyl ligands. Indirect evidence suggests the active species is not molybdenum(O) but some higher oxidation state.