In the present work the IR spectra of CH₄, CD₄, C₂H₄, C₂H₂, CH₃OH and CH₃OD adsorbed on C₆₀ films have been studied at different temperatures, and shifts in the resonance frequencies of the adsorbed species as compared to the gas phase were measured. In the cases of CH₄, C₂H₄ and C₂H₂, comparison of the spectral shifts in the C—H stretching region for the three molecules showed an increase in Δν from methane (Δν=–11 cm^–1) to ethene (Δν=–17 cm^–1) and acetylene (Δν=–34 cm^–1). In all instances the absorptions in the C—H(C—D) stretching vibration region were found to be weaker in intensity than those in the other spectral regions. With acetylene, a shoulder on the ν₅ band and a resolved shoulder on the ν₃ band were found, and were attributed to acetylene adsorbed on two different sites. Shifts in frequency of the adsorbed molecules were noticed as the equilibrium pressure was increased. In the case of adsorbed acetylene, the shifts were attributed to lateral interactions between adsorbed C₂H₂ molecules. No induced absorptions were found. In the cases of adsorbed methanol and deuteriated methanol, three absorption regions were distinguished in the spectrum. The frequency of the O—H stretching vibration band found at 3320 cm^–1 is similar to the absorption of liquid methanol, suggesting that CH₃OH is adsorbed as clusters. In the C—H stretching region (3000–2700 cm^–1), frequency shifts as compared to the gas (Δν= 20–40 cm^–1) and liquid phases (Δν= 6–7 cm^–1) were measured. The band at 1028 cm^–1, which is assigned to the C—O stretching vibration, persisted in part and was shifted to 1024 cm^–1 at higher temperatures and on evacuation. From this result it is inferred that a small fraction of methanol is either chemisorbed or physisorbed on high-energy sites such as voids between C₆₀ molecules. Similar results were found when deuteriated methanol (CH₃OD) was adsorbed on C₆₀.