GENERALIZED SYMMETRY AND VIBRATIONAL-STATES IN HALOGENE-FULLERENE COMPOUNDS

We present an experimental and theoretical study of phonon subsystem o f different fullerites and halogene-fullerenes such as: C-60, C-70, C6 0L4-x, C70L2, C60Br24, C60Cl24, and C70Clx. Two types of chemical bond ing in these materials have been established: (i) C60I4-x and C70I2 co mpounds are formed by C-60 or C-70 molecule sublattice, and I-2 molecu le sublattice which weakly interact via van-der-Waals forces; (ii) C60 Br24, C60Cl24, and C70Cl17 compounds are characterized by a strong cov alent bonding C-Br, C-Cl. In C60Cl24, we discovered the effect of reso nance Raman scattering. This effect is attributed to interaction of ph onon subsystem and electron states with energies 2.3-2.5 eV.