I-129 MOSSBAUER AND X-RAY-DIFFRACTION STUDIES OF THE IODINE-FULLERENECOMPOUND C-60(I-2)(APPROXIMATE-TO-2)

I-129-Mossbauer spectroscopy was applied to study the chemical nature of iodine in C-60(I-2)(similar to 2). Spectra in the temperature regio n 4.2 K - 120 K reveal the presence of two inequivalent sites of iodin e with hyperfine parameters related to those of molecular iodine. The two sites have different local symmetry and different anisotropic bind ing strength. These findings are discussed in conjunction with a recen t x-ray diffraction study of single-crystalline C-60(I-2)(similar to 2 ) yielding also two inequivalent iodine sites with drastically differe nt vibrational amplitudes. The synopsis of the informations obtained f rom both studies reveals a detailed structural model for the arrangeme nt of the inserted I-2 molecules in the hexagonal lattice of C-60(I-2) (similar to)2.