| Abstract
| - Triclinic C60·2ferrocene, which melts peritectically at 495 K (ΔπH = +50 J g-1), can formby direct union of its components with a negative excess volume of −68 Å3 per formula unit,although the enthalpy of deferrocenation into fcc C60 and ferrocene vapor is virtually thesame as for the sublimation of pure ferrocene. C60 solubility in molten ferrocene is about 0.5mol % at 495 K. The strong anisotropy of the thermal expansion tensor illustrates theanisotropy of intermolecular interactions inferred from the crystal structure in the 90−300K range. The existence of nonnegligible interactions is corroborated by the persistence ofthe crystalline local order in the amorphous phase obtained by grinding, which reverts tothe initial crystalline phase upon heating. Thus, from the thermodynamic and structuralpoints of view, C60·2ferrocene behaves as the C60·2S8 solvate.
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