Generalized symmetry and vibrational states in halogene - fullerene compounds

Abstract We present an experimental and theoretical study of phonon subsystem of different fullerites and halogene-fullerenes such as: C 60 , C 70 , C 60 I 4−x , C 70 I 2 , C 60 Vr 24 , and C 70 Cl x . Two types of chemical bonding in these materials have been established: (i) C 60 I 4−x and C 70 I 2 compounds are formed by C 60 or C 70 molecule sublattice, and I 2 molecule sublattice which weakly interact via van-der-Waals forces; (ii) C 60 Br 24 , C 60 Cl 24 , and C 70 Cl 17 compounds are characterized by a strong covalent bonding CBr, CCl. In C 60 Cl 24 , we discovered the effect of resonance Raman scattering. This effect is attributed to interaction of phonon subsystem and electron states with energies 2.3 – 2.5 eV.