Fullerene C 70, toluene 1:1 solvate: structural and thermodynamic evidences

Abstract

X-ray diffraction and thermodynamic measurements show that crystalline fullerene C 70 obtained from toluene solutions is a C 70, toluene 1:1 solvate. Its structure is orthorhombic with space group Pbca ( a = 21.075 Å, b = 32.990 Å, c = 10.844 Å). The evolution of this solvate towards the face-centred cubic and hexagonal phases of pure C 70 is described and a hierarchy of relative stabilities of these latter phase is tentatively proposed.