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首页> 外文期刊>Chemistry: A European journal >Phase Transition of [2,2]-Paracyclophane – An End to an Apparently Endless Story
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Phase Transition of [2,2]-Paracyclophane – An End to an Apparently Endless Story

机译：[2,2]-环芳烃的相变–终结无尽的故事

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摘要

In this contribution, the solid-state low-temperature phase structure of [2,2]-paracyclophane is unambiguously characterised by single-crystal X-ray analysis. Additionally, a heat capacity measurement was undertaken, which proves the existence of a λ-type phase transition at 45 K, a transition that is connected with the formation of a secondary C_p/T feature at 60 K. The low-temperature phase (<45 K) crystallises in the lower symmetry space group P4 n2, whereas the high-temperature phase (>60 K) crystallises in space group P4_2/mnm. This proves what has been postulated both by experimental and theoretical chemists but has repeatedly been dismissed as speculation many times.
机译：通过这种贡献，通过单晶X射线分析明确地表征了[2，2]-对环环烷的固态低温相结构。此外，进行了热容量测量，证明了在45 K时存在λ型相变，该相变与在60 K时形成次级C_p / T特征有关。低温相（< 45 K）在较低对称空间群P4 n2中结晶，而高温相（> 60 K）在空间群P4_2 / mnm中结晶。这证明了实验化学家和理论化学家都已假定了什么，但已多次被驳斥为推测。

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