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Strategies to Diversification of the Mechanical Properties of Organic Crystals
Journal
Angewandte Chemie
Date Issued
2024
Author(s)
Dai, Shuting
Zhong, Jiangbin
Yang, Xiqiao
Chen, Chao
Zhou, Liping
Liu, Xinyu
Sun, Jingbo
Ye, Kaiqi
Zhang, Hongyu
Naumov, Panče
Lu, Ran
Abstract
Structurally ordered soft materials that respond to complementary stimuli are susceptible to control over their spatial and temporal morphostructural configurations by intersectional or combined effects such as gating, feedback, shape-memory, or programming. In the absence of general and robust design and prediction strategies for their mechanical properties, at present, combined chemical and crystal engineering approaches could provide useful guidelines to identify effectors that determine both the magnitude and time of their response. Here, we capitalize on the purported ability of soft intermolecular interactions to instigate mechanical compliance by using halogenation to elicit both mechanical and photochemical activity of organic crystals. Starting from (E)-1,4-diphenylbut-2-ene-1,4-dione, whose crystals are brittle and photoinert, we use double and quadruple halogenation to introduce halogen-bonded planes that become interfaces for molecular gliding, rendering the material mechanically and photochemically plastic. Fluorination diversifies the mechanical effects further, and crystals of the tetrafluoro derivative are not only elastic but also motile, displaying the rare photosalient effect.
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Dec 4, 2024
Dec 4, 2024
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