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Structural Collapse of the Hydroquinone-Formic Acid Clathrate: APressure-Medium-Dependent Phase Transition

机译:对苯二酚-甲酸包合物的结构崩溃:压力-依赖于介质的相变

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摘要

The energy landscape governing a new pressure-induced phase transition in the hydroquinone-formic acid clathrate is reported in which the host structure collapses, opening up the cavity channels within which the guest molecules migrate and order. The reversible isosymmetric phase transition causes significant changes in the morphology and the birefringence of the crystal. The subtle intermolecular interaction energies in the clathrate are quantified at varying pressures using novel model energies and energy frameworks. These calculations show that the high-pressure phase forms a more stable host network at the expense of less-stable host-guest interactions. The phase transition can be kinetically hindered using a nonhydrostatic pressure-transmitting medium, enabling the comparison of intermolecular energies in two polymorphic structures in the same pressure range. Overall this study illustrates a need for accurate intermolecular energies when analyzing self-assembly structures and supramolecular aggregates.
机译:据报道,在氢醌-甲酸包合物中控制新的压力诱导的相变的能量格局,其中主体结构塌陷,打开了客体分子在其中迁移和有序的空腔通道。可逆的等对称相变会导致晶体的形态和双折射发生重大变化。使用新颖的模型能量和能量框架,在变化的压力下,对包合物中的微妙的分子间相互作用能进行了定量。这些计算表明,高压阶段形成了更稳定的宿主网络,但代价是不稳定的宿主—来宾交互作用。使用非静压压力传递介质可以在动力学上阻止相变,从而可以比较相同压力范围内两个多晶型结构中的分子间能。总体而言,这项研究表明,在分析自组装结构和超分子聚集体时,需要精确的分子间能量。

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