Wenyang Zhao, Zeyang Ding, Tong Lu and Shimei Jiang*,
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引用次数: 0
Abstract
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.