The infrared spectra of two fullerene derivatives, C60O and C61H2, have been measured in the 4000-200 cm(-1) frequency range between 10 K and room temperature. Due to symmetry lowering with respect to C-60, the infrared activity favors the assignment of the C-60 Silent modes. The experimental results are compared with vibrational calculations based on semiempirical methods. The frequencies of the epoxide and CH2 bridges have been identified in the spectrum and correlated with calculated values. Both the O and CH2 bridges cause local perturbations of the C-60 cluster and do not significantly change the vibrations of the cage. Temperature effects on the infrared spectra are briefly discussed.