Liu Huapeng, Lu Zhuoqun, Tang Baolei, Qu Cheng, Zhang Zuolun, Zhang Hongyu
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Qianjin Street, Changchun, P. R. China.
Angew Chem Int Ed Engl. 2020 Jul 27;59(31):12944-12950. doi: 10.1002/anie.202002492. Epub 2020 May 25.
Flexible organic single crystals capable of plastic or elastic deformations have a variety of potential applications. Although the integration of plasticity and elasticity in a crystal is theoretically possible and it may cause rich and complex deformations which are highly demanded for potential applications, the integration is hard to realize in practice. Here, we show that through utilizing different modes of external forces for influencing molecular packing in different crystallographic directions, plastic helical twisting and elastic bending can both be achieved for a crystal, and they can even be realized simultaneously. Detailed crystallographic analyses and contrast experiments disclose the mechanisms behind these two kinds of distinct deformations and their mutual compatibility. Based on the plastically twistable nature of the crystal, a new application field of flexible organic single crystals, namely polarization rotators, is successfully opened up.
能够发生塑性或弹性形变的柔性有机单晶具有多种潜在应用。尽管在晶体中整合塑性和弹性在理论上是可行的，且这可能会引发丰富而复杂的形变，而这些形变对于潜在应用来说是非常必要的，但在实践中很难实现这种整合。在此，我们表明，通过利用不同模式的外力来影响不同晶体学方向上的分子堆积，一种晶体既能实现塑性螺旋扭曲，又能实现弹性弯曲，甚至这两种形变还能同时实现。详细的晶体学分析和对比实验揭示了这两种不同形变背后的机制及其相互兼容性。基于该晶体的可塑性扭曲特性，成功开辟了柔性有机单晶的一个新应用领域，即偏振旋转器。
