Author/Authors :
Céolin، نويسنده , , R. and Agafonov، نويسنده , , V. and Bachet، نويسنده , , B. and Gonthier-Vassal، نويسنده , , A. and Szwarc، نويسنده , , H. and Toscani، نويسنده , , S. and Keller، نويسنده , , G. and Fabre، نويسنده , , C. and Rassat، نويسنده , , A.، نويسنده ,
Abstract :
Crystallographic and thermodynamic experiments show that crystalline C60 obtained by slow evaporation of solutions in n-heptane is a C60, n-heptane 1:1 solvate. Its lattice is hexagonal, Laue class 6/mmm, with a = 10.00(4) Å and c = 10.16(1) Å. No transition is observed at temperatures higher than 100 K, and desolvation into fcc C60 occurs at about 360 K with ΔH = +43.5 J g−1, close to the sublimation enthalpy for pure n-heptane. Another binary compound, presumably a polymorph of the former, is sometimes obtained by rapid evaporation of toluene + n-heptane mixtures. Its lattice is orthorhombic, Immm, with a = 10.07 Å, b = 10.22 Å and c = 48.9 Å.
