Tracing shape memory effect and elastic bending in a conformationally flexible organic salt

Hasija, Avantika; Ranjan, Subham; Guerin, Sarah; Kiran, M. S. R. N.; Takamizawa, Satoshi; Chopra, Deepak

doi:10.1039/d2tc00076h

Cited by 15 publications

(14 citation statements)

References 50 publications

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“…The weak dispersive interactions are capable of accumulating stress in all directions, and the layered structure is prone to rearrange, resulting in a sudden release of strain at some interfaces, thereby showing impressive mechanical motion. More flexible nature of π⋅⋅⋅π interactions of Form R could effectively disperse the thermal stress accumulated on the heated surface, thus resulting in lower jumping probability to Form R [13c] . Therefore, multiple dispersive intermolecular interactions not only contribute to the elasticity of the crystal, but also can effectively accumulate strain to promote crystal jumping.…”

Section: Resultsmentioning

confidence: 99%

Organic Crystals with Response to Multiple Stimuli: Mechanical Bending, Acid‐Induced Bending and Heating‐Induced Jumping

Chen

Zhang

et al. 2022

Chemistry A European J

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Multiple stimuli‐responsive molecular crystals are attracting extensive attentions due to their potential as smart materials, such as molecular machines, actuators, and sensors. However, the task of giving a single crystal multiple stimuli‐responsive properties remains extremely challenging. Herein, we found two polymorphs (Form O and Form R) of a Schiff base compound, which could respond to multiple stimuli (external force, acid, heat). Form O and Form R have different elastic deformability, which can be attributed to the differences in the molecular conformation, structural packing and intermolecular interactions. Moreover, both polymorphs exhibit reversible bending driven by volatile acid vapor, which we hypothesize is caused by reversible protonation reaction of imines with formic acid. In addition, jumping can be triggered by heating due to the significant anisotropic expansion. The integration of reversible bending and jumping into one single crystal expands the application scope of stimuli‐responsive crystalline materials.

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Section: Resultsmentioning

confidence: 99%

Organic Crystals with Response to Multiple Stimuli: Mechanical Bending, Acid‐Induced Bending and Heating‐Induced Jumping

Chen

Zhang

et al. 2022

Chemistry A European J

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“…One of the polymorphs of the salt displayed thermosalient effects and elastic flexibility. 139 By changing the temperature, Form I underwent a reversible phase transition to Form II, accompanied by macroscopic mechanical responses such as bending, splitting, shape memory and jumping. The torsionally flexible diphenyl phosphate anion underwent a slight rotation of the anion under thermal stimuli, resulting in martensitic transformations, and thereby resulting in thermosalient effects.…”

Section: Thermal Stimuli-responsive Flexible Crystalline Materialsmentioning

confidence: 99%

Stimuli-responsive flexible organic crystals

Chen

Wang

et al. 2023

J. Mater. Chem. C

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“…The abundant intermolecular interactions can reduce the rigidity of the crystals and act as the "structural buffer" to dissipate the stress applied to the crystal by adjusting the bond distances and angles during elastic bending [35]. In addition, the weak hydrogen-bond network can make the different π-stacked columns prefer synergic movements, leading to higher uniformity and reducing the risk of fracture during bending [36,37]. Hence, M-I crystal can bend along the (0−11) crystal face.…”

Section: D Elasticity Of M-i Crystal and Its Mechanismmentioning

confidence: 99%

Organic crystals with two-dimensional bending and manually twistable properties for flexible optical waveguides

et al. 2023

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Most organic crystals are brittle, which greatly restricts their applications in flexible smart materials. Herein, we reported two multi-flexible organic crystals. One of them exhibits two-dimensional (2D) elasticity, while the other one exhibits dual plasticity and elasticity along different directions. Their brittle polymorphs were also prepared to establish the correlations of the structure-property of flexible organic crystals from the perspective of crystal engineering. These flexible crystals can be manually twisted without fracture. Therefore, it was verified that manually twisted crystals can also be prepared from 1D plastic and elastic crystals, which has not been reported before. Detailed crystallographic analyses, energy framework calculations and nanoindentation tests were used to reveal the mechanism of the multiple mechanical responses of these crystals. It was found that these properties can be ascribed to the large differences in strength and orientation between the intermolecular interactions, together with the unique molecular arrangement in the crystals. Finally, the application of these flexible crystalline materials in the field of the optical waveguide was developed.

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Tracing shape memory effect and elastic bending in a conformationally flexible organic salt

Abstract: Reversible responses as a result of thermal and mechanical stimuli are investigated for an organic salt polymorph. The dissipation of strain occurs by conformational and rotational changes in molecule leading to exhibition of shape memory effect.

Cited by 15 publications

References 50 publications

Organic Crystals with Response to Multiple Stimuli: Mechanical Bending, Acid‐Induced Bending and Heating‐Induced Jumping

Organic Crystals with Response to Multiple Stimuli: Mechanical Bending, Acid‐Induced Bending and Heating‐Induced Jumping

Stimuli-responsive flexible organic crystals

Organic crystals with two-dimensional bending and manually twistable properties for flexible optical waveguides

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