Vibrational Infrared Spectra of the Two Major Isomers of [84]Fullerene: C84{D2(IV)} and C84{D2d(II)}

We present the first vibrational study of isomers of the same fullerene; C 84 { D 2 (IV)} and C 84 { D 2 d (II)}. Owing to their lower symmetry, the spectra of these isomers exhibit many more lines than the previously studied fullerenes C 60, C 70, and C 76 . The temperature dependence of the IR spectra indicates a structural phase change occurs, for both isomers, near 150 K.