Zhang Yun-Fang, Di Fang-Fang, Li Peng-Fei, Xiong Ren-Gen
Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China.
Chemistry. 2022 Jan 24;28(5):e202102990. doi: 10.1002/chem.202102990. Epub 2021 Dec 2.
In recent years, molecular ferroelectrics have received great attention due to their low weight, mechanical flexibility, easy preparation and excellent ferroelectric properties. Among them, crown-ether-based molecular ferroelectrics, which are typically composed of the host crown ethers, the guest cations anchored in the crown ethers, and the counterions, are of great interest because of the host-guest structure. Such a structure allows the components to occur order-disorder transition easily, which is beneficial for inducing ferroelectric phase transition. Herein, we summarized the research progress of crown ether host-guest molecular ferroelectrics, focusing on their crystal structure, phase transition, ferroelectric-related properties. In view of the small spontaneous polarization and uniaxial nature, we outlook the chemical design strategies for obtaining high-performance crown-ether-based molecular ferroelectrics. This minireview will be of guiding significance for the future exploration of crown ether host-guest molecular ferroelectrics.
近年来，分子铁电体因其重量轻、机械柔韧性好、易于制备以及优异的铁电性能而备受关注。其中，基于冠醚的分子铁电体由于其主客体结构而备受关注，这类铁电体通常由主体冠醚、锚定在冠醚中的客体阳离子和抗衡离子组成。这种结构使得组分易于发生有序-无序转变，有利于诱导铁电相变。在此，我们总结了冠醚主客体分子铁电体的研究进展，重点关注其晶体结构、相变以及与铁电相关的性能。鉴于其自发极化小和单轴性质，我们展望了获得高性能基于冠醚的分子铁电体的化学设计策略。本综述将对冠醚主客体分子铁电体的未来探索具有指导意义。
