Solid-state studies on C60 solvates grown from n-heptane

✍ Scribed by R. Céolin; V. Agafonov; B. Bachet; A. Gonthier-Vassal; H. Szwarc; S. Toscani; G. Keller; C. Fabre; A. Rassat

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 301 KB
• Volume: 244
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00886-9

✦ Synopsis

Crystallographic and thermodynamic experiments show that crystalline C60 obtained by slow evaporation of solutions in n-heptane is a C6o, n-heptane 1:1 solvate. Its lattice is hexagonal, Laue class 6/mmm, with a = 10.00(4) ,A and c = 10.16(1) .~. No transition is observed at temperatures higher than 100 K, and desolvation into fcc C6o occurs at about 360 K with AH = +43.5 J g-l, close to the sublimation enthalpy for pure n-heptane. Another binary compound, presumably a polymorph of the former, is sometimeSo obtained° by rapid evaporation of toluene + n-heptane mixtures. Its lattice is orthorhombic, Immm, with a = 10.07 A, b = 10.22 A and c = 48.9 A.