Wenyang Zhao, Zeyang Ding, Tong Lu and Shimei Jiang*,
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引用次数: 0
摘要
赋予发光晶体可调节的机械柔性和刚度是一项挑战。在这项工作中,我们基于一种新型乙氧基取代的氰二苯乙烯衍生物(DEA),成功地在单一体系中实现了水蒸气调节的机械和发光特性。具体来说,DEA 的原始晶体具有弹性和黄色荧光。在水蒸气辅助发烟作用下,得到了具有橙色荧光的硬质晶体(DEA-w)。晶体结构分析表明,水能与 DEA 分子形成多个氢键,进一步推动了整个堆积结构(晶体到晶体)的转变。实验和理论研究表明,红移荧光是由于分子间重叠增强,从而有利于准分子发射。软到硬 "的转变归因于填料从一维π柱转变为二维强氢键网络,从而提供了更强的抗外部变形能力。此外,DEA-w 晶体在切割时会发生典型的脆性断裂,具有极佳的可加工性。这项研究为原位调节晶体的机械性能提供了一种有启发性的方法。
Water-Induced Crystal-to-Crystal Transformation: Switchable Mechanical and Luminescent Properties
Endowing luminescent crystals with adjustable mechanical flexibility and rigidity is a challenge. In this work, we successfully achieve water-vapor-regulated mechanical and luminescent properties in a single system based on a novel ethoxy-substituted cyanostilbene derivative (DEA). Specifically, the pristine crystal of DEA exhibits elasticity with a yellow fluorescence. Upon water-assisted vapor fuming, a rigid crystal (DEA-w) with an orange fluorescence was obtained. The analysis of crystal structures shows that water can form multiple hydrogen bonds with the DEA molecule, further compelling the whole packing structure (crystal-to-crystal) transformation. Experimental and theoretical investigations reveal that the red-shifted fluorescence is ascribed to the enhanced intermolecular overlap, which favors an excimer emission. The “soft-to-rigid” transition is attributed to the packing transformation from a one-dimensional π column to a two-dimensional strong hydrogen bond network, which provides stronger resistance to external deformation. In addition, the DEA-w crystal undergoes a typical brittle fracture under cutting, offering excellent processability. This study provides an inspired method for in situ adjustment of the mechanical properties of the crystal.
期刊介绍:
The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials.
Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.