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New Insights into the Structural Complexity of C-60 center dot 2S(8): Two Crystal Morphologies, Two Phase Changes, Four Polymorphs

机译:C-60中心点2S(8)结构复杂性的新见解:两种晶体形态,两种相变,四种多晶型物

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摘要

Three new polymorphs of C-60 center dot 2S(8) were discovered. The previously known structure (first reported by Roth and Adelmann in 1993 hereby designated as a) crystallizes in space group C2/c with Z = 4 and changes to a triclinic structure (beta) in space group P (1) over bar 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 (gamma) crystallizes in space group P2(1)/c with Z = 4 at room temperature and undergoes a phase change to Pc (delta) 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 C-60 molecules. Both of the phase changes are reversible.
机译:发现了C-60中心点2S(8)的三个新的多晶型物。先前已知的结构(由Roth和Adelmann于1993年首次报道,现指定为a)在Z = 4的空间组C2 / c中结晶,并在Z = 4的条上变为空间P(1)中的三斜结构(β)。当温度降低到260 K以下时,显示在图4中。重新研究了室温结构,并描述了新的有序低温结构。一种新的伴随多晶型(γ)在室温下在Z = 4的空间群P2(1)/ c中结晶,当温度降低到180 K以下时,其相变为Z = 4的Pc(δ)。由几何和温度因子的变化所指示,很显然,低温相代表了C-60分子排列顺序的增加。两个相位变化都是可逆的。

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