Author/Authors :
Toscani، نويسنده , , S. and Allouchi، نويسنده , , H. and Tamarit، نويسنده , , J.Ll. and Lَpez، نويسنده , , D.O. and Barrio، نويسنده , , M. and Agafonov، نويسنده , , V. and Rassat، نويسنده , , A. and Szwarc، نويسنده , , H. and Céolin، نويسنده , , R.، نويسنده ,
Abstract :
Decagonal C60 crystals grown from n-hexane solutions correspond to an orthorhombic 1:1 solvate (a=10.249 Å, b=31.308 Å, c=10.164 Å). It forms with negative excess volume (−55.5 Å3 per formula unit) and transforms on heating into fcc C60 (desolvation enthalpy of +50.6 kJ per solvate mole, close to the sublimation enthalpy for pure n-hexane) while n-hexane desorption from fcc C60 is accompanied by an enthalpy of +48.6 kJ per solvent mole. Thus solvate formation is preferred to solvent adsorption. Orthorhombic C60·1 n-hexane undergoes no degradation when stored in air for 9 years at room temperature in the dark.
