Structures of C60 intercalation compounds

In the past two years, many intercalation compounds of C60, have been prepared and characterized by X-ray powder diffraction techniques. The M-C60 systems with M = Li, Na, K, Rb, Cs and Ca have been studied, and the structures of several compounds have been determined in considerable detail, including the face-centered cubic superconductors K3C60 and Rb3C60, body-centered tetragonal K4C60, body-centered cubic M6C60 with M = K, Rb and Cs, simple hexagonal C60I4, and the monoclinic molecular ferromagnet tetrakis-dimethylamino-ethylene (TDAE) C2N4(CH3)8C60. The Rietveld profile technique for structure refinement coupled with high resolution synchrotron X-ray powder data has played an important role in providing accurate structural data for many of these compounds. In this article, a detailed review of the literature dealing with structural studies on the intercalated compounds of C60 will be given.