Switchable Dielectric Phase Transition Triggered by Pendulum‐Like Motion in an Ionic Co‐crystal,Chemistry - An Asian Journal

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Switchable Dielectric Phase Transition Triggered by Pendulum‐Like Motion in an Ionic Co‐crystal
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-09-07 , DOI: 10.1002/asia.201801056
Qing Wang ₁ , Wan-Ying Zhang ₁ , Ping-Ping Shi ₁ , Qiong Ye ₁ , Da-Wei Fu ₁

Affiliation

Molecular‐based ionic co‐crystals, which have the merits of low‐cost/easy fabrication processes and flexible structure and functionality, have already exhibited tremendous potential in molecular memory switches and other electric devices. However, dipole (ON/OFF switching) triggering is a huge challenge. Here, we introduce a pendulum‐like dynamic strategy to induce the order–disorder transition of a co‐crystal [C₅H₇N₃Cl]₃[Sb₂Br₉] (compound 1). Here, the anion and cation act as a stator and a pendulum‐like rotor (the source of the dielectric switch), respectively. The temperature‐dependent dielectric and differential scanning calorimetry (DSC) analyses reveal that 1 undergoes a reversible phase transition, which stems from the order–disorder transition of the cations. The thermal ON/OFF switchable motions make 1 a promising candidate to promote the development of bulk crystals as artificial intelligent dielectric materials. In addition, the pendulum‐like molecular dynamics and distinct arrangements of two coexisting ions with a notable offset effect promotes/hinders dipolar reorientation after dielectric transition and provides a rarely observed but fairly useful and feasible strategy for understanding and modulating the dipole motion in crystalline electrically polarizable materials.

中文翻译：

离子共晶体中像钟摆运动一样触发的可切换介电相变

基于分子的离子共晶体具有低成本/易于制造工艺，灵活的结构和功能的优点，已经在分子存储开关和其他电子设备中展现出巨大的潜力。但是，偶极（开/关切换）触发是一个巨大的挑战。在这里，我们介绍了一种类似摆的动态策略，以诱导共晶体[C ₅ H ₇ N ₃ Cl] ₃ [Sb ₂ Br ₉ ]的有序转变（化合物 1）。在这里，阴离子和阳离子分别充当定子和类摆转子（介电开关的源）。温度相关的介电和差示扫描量热法（DSC）分析表明1经历了可逆的相变，这是由于阳离子的有序无序转变引起的。热开/关可切换动作使1一个有希望的候选人，它将促进大晶体作为人工智能介电材料的发展。此外，像钟摆一样的分子动力学和两个共存离子的独特排列具有明显的偏移效应，可促进/阻碍介电跃迁后的偶极重取向，并提供了一种鲜为人知但相当有用和可行的策略，用于理解和调节晶体电中的偶极运动。可极化材料。

更新日期：2018-09-07

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