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首页> 外文期刊>Crystal growth & design >Phase transition triggered by ordering of unique pendulum-like motions in a supramolecular complex: Potassium hydrogen bis(dichloroacetate)-18-crown-6
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Phase transition triggered by ordering of unique pendulum-like motions in a supramolecular complex: Potassium hydrogen bis(dichloroacetate)-18-crown-6

机译：由超分子复合物中独特的类摆运动的顺序触发相变：双（二氯乙酸钾）-18-crown-6氢氢钾

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摘要

A novel supramolecular phase change material (PCM) potassium hydrogen bis(dichloroacetate)-18-crown-6 (1), which undergoes a reversible second-order phase transition at 181.8 K (T_c), has been successfully synthesized and grown as bulk crystals. DSC measurements confirm its reversible phase transition with a thermal hysteresis of 1.6 K. Dielectric permittivities also display obvious anomalies approaching T_c, being characteristic for the reversible phase transition. Variable-temperature X-ray single-crystal diffractions demonstrate that 1 behaves as a molecular rotor above room temperature in which the chlorine atoms rotate around the C-C axis of the CHCl_2COO-/CHCl_2COOH exhibiting distinct pendulum-like motions, and the (18-crown-6)·K~+ part acts as a stator. Further studies reveal that the origin of its phase transition was ascribed to the moving close together of the whole set molecules from the original position, which is induced by the order-disorder transformation of the pendulum-like motions of the CHCl_2COO~-/CHCl_ 2COOH units between the LT phase and RT phase. We believe that all the results would urge the exploration of new phase change functional materials.
机译：一种新型的超分子相变材料（PCM）双（二氯乙酸盐）-18-crown-6钾（1）在181.8 K（T_c）处经历了可逆的二级相变，现已成功合成并生长为块状晶体。 DSC测量确认其可逆相变具有1.6 K的热滞。介电常数也显示出接近T_c的明显异常，这是可逆相变的特征。可变温度X射线单晶衍射表明，1在高于室温的情况下充当分子转子，其中氯原子围绕CHCl_2COO- / CHCl_2COOH的CC轴旋转，表现出明显的摆状运动，并且（18冠-6）·K〜+部分起定子作用。进一步的研究表明，其相变的起源归因于整个分子从原始位置开始的紧密移动，这是由CHCl_2COO〜-/ CHCl_2COOH的钟摆状运动的有序无序转换引起的。 LT相和RT相之间的单位。我们相信所有结果将促使人们探索新的相变功能材料。

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