We present IR transmission mesurements for two isomers of the endohedral co
mpound Sc-2@C-84 with D-2d (No.23) and C-s (No.10) symmetry. The measuremen
ts were performed im the far infrared region between 80 cm(-1) and 500 cm(-
1) and at temperatures from 80 K to 300 K. We identified several modes and
investigated their dependence on the symmetry of the cage and on the temper
ature.