Mechanically Flexible Organic Crystals Achieved by Introducing Weak Interactions in Structure: Supramolecular Shape Synthons
Mechanically Flexible Organic Crystals Achieved by Introducing Weak Interactions in Structure: Supramolecular Shape Synthons
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DOI：
10.1021/jacs.6b05118
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发表时间：
2016-10-19
影响因子：
15
通讯作者：
Reddy, C. Malla
中科院分区：
文献类型：
--
作者：
Krishna, Gamidi Rama;Devarapalli, Ramesh;Reddy, C. Malla
尽管有序有机材料在高性能机械执行器、晶体管、太阳能电池、光子学和生物电子学方面具有巨大的潜力，但控制其机械性能仍然是一个艰巨的挑战。在这里，我们展示了一种晶体工程方法，通过在结构中引入活动滑移面，设计了三种无关类型化合物的机械可重构、塑性灵活的单晶(约10个)。不同的非干扰超分子弱相互作用，即范德华(VDW)、pi堆积和氢键基团。球形疏水基团通过形状互补(形状合成子)组装在一起，可靠地形成低能量滑移面，从而促进了令人印象深刻的机械灵活性，这使得晶体可以模塑成字母字符，拼写为“有机晶体”。这项研究首次报道了通过设计制备一系列奇异的塑料晶体，展示了软相互作用在调节有序分子材料的力学行为方面的潜力，包括那些来自pi共轭体系的材料。
Controlling mechanical properties of ordered organic materials remains a formidable challenge, despite their great potential for high performance mechanical actuators, transistors, solar cells, photonics, and bioelectronics. Here we demonstrate a crystal engineering approach to design mechanically reconfigurable, plastically flexible single crystals (of about 10) of three unrelated types of compounds by introducing active slip planes in structures via. different noninterfering supramolecular weak interactions, namely van der Waals (vdW), pi-stacking, and hydrogen bonding groups. Spherical hydrophobic groups, which assemble via shape complementarity (shape synthons), reliably form low energy slip planes, thus facilitating an impressive mechanical flexibility, which allowed molding the crystals into alphabetical characters to spell out "organic crystal". The study, which reports the preparation of a series of exotic plastic crystals by design for the first time, demonstrates the potential of soft interactions for tuning the mechanical behavior of ordered molecular materials, including those from pi-conjugated systems.