VIBRATIONAL SPECTROSCOPY OF C-60 AND C-70 TEMPERATURE-DEPENDENT STUDIES

The FT-Raman and FT-IR spectra of C60 and C70 have been obtained under high resolution conditions, both for solid material and in solution. The very small differences in frequency and line width for solution and solid-state spectra are interpreted in terms of minimal intermolecular interactions. The temperature dependence of the infrared modes shows a phase transition near 260 K, in agreement with X-ray results. Below the phase transition temperature, fine structure develops on several of the infrared modes, indicative of an increase in solid-state interactions.