Halogen-Assisted Piezochromic Supramolecular Assemblies for Versatile Haptic Memory

Abstract

Sensory memory is capable of recording information and giving feedback based on external stimuli. Haptic memory in particular can retain the sensation of the interaction between the human body and the environment and help humans to describe the physical quantities in their environment and manipulate objects in daily activities. Although sensitive and accurate tactile sensors have been produced on optical and electronic devices, their rigorous operation and equipment requirements seriously limit their further applicability. In addition, their poor retainability after the removal of external stimuli also warrants further improvements. Thus, haptic memory materials, having simple structures and high sensitivity, are highly desired. Herein, we successfully developed two piezochromic assemblies assisted by halogen bonding for haptic memory. The halogen bond not only contributes to the fabrication of the network and enhances integrative stability but also broadens the natural piezofluorescent range, thus promoting sensory sensitivity. Moreover, the colorimetric change of the assemblies could be well-retained after the stimulus was removed. Upon mild heating treatment, the piezochromic response could be recovered to its original state, confirming the recyclability of this haptic memory material for use in practical applications. The present work enriches the library of piezochromic materials with enhanced performance for haptic memory.

Catalytic activities of NHC‐PdCl2 species based on functionalized tetradentate imidazolium salt in three types of C‐C coupling reactions

“…As shown in Scheme , the anthracene as a starting material reacted with paraformaldehyde to afford 9,10‐bis(chloromethyl)anthracene according to the literature method . Then 9,10‐bis(chloromethyl)anthracene was treated by diethanolamine to form 9,10‐bis[di(2′‐hydroxylethyl)aminomethyl]anthracene.…”

“…N ‐Ethylimidazole and 9,10‐bis(chloromethyl)anthracene were prepared according to the literature methods. All the reagents for synthesis and analyses were of analytical grade and used without further purification.…”

Organic Cocrystals: Beyond Electrical Conductivities and Field‐Effect Transistors (FETs)

“…Zhao et al [98] developed two piezochromic assemblies based on pyridylvinylanthracenes (p-PVA) and F4DIB for haptic memory (Figure 8a). Zhao et al [98] developed two piezochromic assemblies based on pyridylvinylanthracenes (p-PVA) and F4DIB for haptic memory (Figure 8a).…”

“…[4,95] Such dynamic materials can provide advantages because selected properties (such as luminescence and shape) can be turned "on" and "off" reversibly,and may lead to applications in, for example, electronic display and information storage systems,s mart sensors/switches,o ptical switching devices,m emory devices,a nd nonlinear optics. [96][97][98] Up to now,e ven if the co-crystals have been largely used to change their static properties, [99] how to further investigate dynamic multifunctional materials remains ac hallenge.…”

Stimuli‐Responsive Properties of Aggregation‐Induced‐Emission Compounds Containing a 9,10‐Distyrylanthracene Moiety

“…[2][3][4] Piezochromic luminescent materials have received considerable interest in recent years in view of their potentiala pplicationsi n sensors,m emoryc hips, camouflage, optoelectronic devices, and so forth. [5][6][7][8] However,s tudies on piezochromic materials remain inadequate due to the absence of an effective mechanism to illustrate the close correlation between the changes in molecular packinga nd the correspondingl uminescence properties. Therefore, the ability to dynamically control the molecular aggregation state and the consequent fluorescencec olor and/ori ntensity is very important to developn ew piezochromic luminescentmaterials.…”