Sequential‐Stimuli Induced Stepwise‐Response of Pyridylpyrenes

Abstract

Stimuli‐responsive materials, especially multi‐stimuli‐responsive materials, can sense external stimuli such as light, heat, and force, have shown great potential in drug delivery, data storage, encryption, energy‐harvesting, and artificial intelligence. Conventional multi‐stimuli‐responsive materials are sensitive to each independent stimulus, causing losses in the diversity and accuracy of the identification for practical application. Herein, a unique phenomenon of sequential‐stimuli induced stepwise‐response generated from elaborately designed single‐component organic materials is reported, which shows large bathochromic shifts up to 5800 cm−1 under sequential stimuli of force and light. In contrast to multi‐stimuli‐responsive materials, the response of these materials strictly relies on the sequence of stimuli, allowing logicality, rigidity, and accuracy to be integrated into one single‐component material. The molecular keypad lock is built based on these materials, pointing promising to a future for this logical response in significant practical applications. This breakthrough gives a new drive to classical stimuli‐responsiveness and provides a fundamental design strategy for new generations of high‐performance stimuli‐responsive materials.

Photorewriting, Time-Resolved Encryption, and Unclonable Anticounterfeiting with Artificial Intelligence Authentication via a Reversible Photoswitchable System

“…With inspiration from the color-changing mechanisms observed in nature, the development of anticounterfeiting labels with dynamic color-changing capabilities proves effective in mitigating issues related to replication. − Consequently, researchers have created a range of anticounterfeiting materials with various stimulus-responsive properties, all of which are inspired by these distinctive qualities. − Among them, optical materials are advantageous because to their simple processing, high yield, and exact design. ,− However, because most optical materials rely on static characteristics or signals and particular security features are easily replicated, they offer minimal security. − Considering this, organic multistimulus-responsive luminescence materials would be promising candidates. − As a result of the fact that they exhibit color and fluorescence change behavior in response to stimuli as well as a controllable structure and function, responsive materials have important applications in the field of anticounterfeiting and information encryption. In recent years, a variety of stimuli-sensitive materials have been developed for mixed combinations of light, − temperature, pH, electricity, ions, mechanical forces, and other stimuli …”

“…30−34 As a result of the fact that they exhibit color and fluorescence change behavior in response to stimuli as well as a controllable structure and function, responsive materials have important applications in the field of anticounterfeiting and information encryption. In recent years, a variety of stimulisensitive materials have been developed for mixed combinations of light, 35−38 temperature, 39 pH, 40 electricity, 41 ions, 42 mechanical forces, 43 and other stimuli. 44 Photochromic materials are an important class of stimulusresponsive materials that have attracted much attention.…”

Highly Selective Protic-Solvent-Mediated Organic–Inorganic Hybrid Cuprous Bromides Achieving Structural Transformation

“…Stimuli-responsive materials (SRMs) with diverse chemical and physical properties are a prominent research hotspot in recent years for their potential applications in smart devices, data storage, anticounterfeiting, and sensors. − Ionic metal halide perovskites and their derivatives are an emerging class of SRMs that benefit from their inherent low formation energy and soft lattice nature, which enables them to be prone to reversible chemical and structural transformations upon exposure to various external stimuli such as light, heat, humidity, and chemical environment.…”

Photo-luminochromism of organic crystals arising from subtle molecular rearrangement

“…However, the challenge lies in the fact that current methods for obtaining distinct aggregation states are primarily limited to arti cials means, such as single crystal cultivation using various solvents. The spontaneous transformation between target aggregation states is rarely achieved [31][32][33] . Consequently, there is a pressing need to develop materials that can change their…”