New Insights into the Structural Complexity of C60路2S8: Two Crystal Morphologies, Two Phase Changes, Four Polymorphs

详细信息    查看全文

• 作者：Kamran B. Ghiassi ; Susanne Y. Chen ; Joseph Wescott ; Alan L. Balch ; Marilyn M. Olmstead
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：January 7, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：404-410
• 全文大小：515K
• ISSN：1528-7505

文摘

Three new polymorphs of C₆₀路2S₈ were discovered. The previously known structure (first reported by Roth and Adelmann in 1993 hereby designated as 伪) crystallizes in space group C2/c with Z = 4 and changes to a triclinic structure (尾) in space group P1虆 with Z = 4 when the temperature is decreased below 260 K. The room-temperature structure was reinvestigated, and the new, ordered, low-temperature structure is described. A new, concomitant, polymorph (纬) crystallizes in space group P2₁/c with Z = 4 at room temperature and undergoes a phase change to Pc (未) with Z = 4 when the temperature is decreased below 180 K. As indicated by geometric and temperature factor changes, it is clear that the low-temperature phases represent an increase in the level of order in the arrangement of C₆₀ molecules. Both of the phase changes are reversible.