Stoichiometry and phase behavior of carbon tetrachloride solvates of C60

Two solvated crystals of C60 were formed from CCl4 solutions. It was found that the cubic solvated crystal is composed of a C60(CCl4)13 formula unit while the hexagonal crystal has a C60(CCl4)2 unit. These solvates have phase behavior comparable with that of cyclohexane solvates of C60, being closely related to binary sphere mixtures with a characteristic diameter ratio of 0 .58. The present calorimetric study strongly suggests that the C60(CCl4)13 crystal has an AB13-type structure, in which icosahedron clusters of CCl4 like those in the cyclohexane analogue are formed.