A controllable and defectless cutting postprocess method <i>via</i> cleavage of an elastic cocrystal based on pyrene and tetrachloroterephthalonitrile

Zhang, Hongyu; Xu, Yan; Tang, Baolei

doi:10.1039/d1ce01438b

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…When the two crystals were cut by the tip of a needle, they split into two separate bulks (Figure c,e). Scanning electron microscopy (SEM) results revealed that the fracture face of the DEA-w crystal was pretty smooth (Figure d), indicating that it underwent a typical brittle fracture under cutting, which was conducive to the integrity of the crystal during processing. , On the contrary, the fracture surface of the DEA crystal appeared rough and full of pores, demonstrating the destruction of crystallinity during the cutting process (Figure f). These results disclosed that the rigid DEA-w crystal exhibited more significant processability than the soft DEA crystal.…”

Section: Resultsmentioning

confidence: 99%

“…5,6 Rigid crystals with high Young's modulus and hardness show great advantages in defect-free crystal processing for optoelectronic devices. 7 Generally, the mechanical properties of organic crystals are highly related to the molecular packing and intermolecular interactions, presenting a complex and difficult task to predict at the molecular level. 8,9 Although diverse soft and rigid crystals have been constructed and reported, few of them have successfully achieved the regulation of mechanical properties via the molecular packing transition in a single system.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The investigation of the mechanical properties of organic luminescent crystals has become an emerging field in materials science. − For instance, soft crystals with elasticity or plasticity have wide potential applications in flexible optical waveguides and wearable devices. , Rigid crystals with high Young’s modulus and hardness show great advantages in defect-free crystal processing for optoelectronic devices . Generally, the mechanical properties of organic crystals are highly related to the molecular packing and intermolecular interactions, presenting a complex and difficult task to predict at the molecular level. , Although diverse soft and rigid crystals have been constructed and reported, few of them have successfully achieved the regulation of mechanical properties via the molecular packing transition in a single system.…”

Section: Introductionmentioning

confidence: 99%

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Water-Induced Crystal-to-Crystal Transformation: Switchable Mechanical and Luminescent Properties

Zhao,

Ding,

et al. 2024

Crystal Growth & Design

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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 ethoxysubstituted 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.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Water-Induced Crystal-to-Crystal Transformation: Switchable Mechanical and Luminescent Properties

Zhao,

Ding,

et al. 2024

Crystal Growth & Design

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Multicomponent flexible organic crystals

et al. 2023

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Flexible organic crystals are emerging as a potential candidate for smart materials and have aroused great interest over the past decade. In view of multicomponent supramolecular synthesis with a distinct advantage over single‐component approach on the control of molecular arrangements and physicochemical properties, we take note of various multicomponent flexible organic crystals in the range from organic co‐crystals, supramolecular salts, solvates, doping organic crystals to solid solution crystals, showing a great diversity of supramolecular architectures such as one‐dimensional columns, two‐dimensional layer packing, and three‐dimensional interlocked structures. Some of them serve as promising multifunctional materials with both flexibility and photoelectric properties such as fluorescence, optical waveguide, and ferroelectricity. In this review, we focus on the packing structures of multicomponent flexible organic crystals and their related mechanical properties, highlight typical research works, and point out the main possible directions that remain to be developed in this field. From the perspectives of crystal engineering and supramolecular chemistry, the flexible crystals outlined here should offer helpful information for further design and investigation on the elusive class of mechanically compliant crystalline compounds.

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A controllable and defectless cutting postprocess method via cleavage of an elastic cocrystal based on pyrene and tetrachloroterephthalonitrile

Abstract: An organic cocrystal based on pyrene and tetrachloroterephthalonitrile was reported in this work, which exhibited both elastic and controllable and defectless cutting postprocess properties. The mechanism of postprocessing properties was...

Cited by 2 publications

References 33 publications

Water-Induced Crystal-to-Crystal Transformation: Switchable Mechanical and Luminescent Properties

Water-Induced Crystal-to-Crystal Transformation: Switchable Mechanical and Luminescent Properties

Multicomponent flexible organic crystals

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