Time‐Resolved Encryption via a Kinetics‐Tunable Supramolecular Photochromic System

Abstract

With the advancement of forgery and decryption methods, conventional static encryption technology is becoming more and more powerless, which strongly demands the development of multistate anticounterfeiting materials as well as advanced multidimensional encryption strategies and technologies. Here a new strategy to realize time‐resolved encryption based on a self‐assembled supramolecular ternary complex is presented, which exhibits tunable dynamic photochromic features caused by the reversible photodimerization/cleavage reactions of the guest chromophores inside the cavity of cucurbit[8]uril (CB[8]). This supramolecular system shows excellent photochromic properties, including extremely rapid response time, high conversion rate, and product‐stereoselectivity, etc. More importantly, the kinetics of the photoreaction can be modulated by simply varying the host–guest ratios in aqueous or quasi‐solid phase, providing the material with finely tunable time‐dependent features, which cannot only be employed in data processing with more extended information, but also construct confidential materials by time‐resolved multidimensional encryption and dynamic anticounterfeiting. The strategic design of kinetics‐tunable supramolecular photochromic materials may provide valuable guidance for the development of more advanced materials for information security.

Modular and hierarchical self-assembly of siRNAs into supramolecular nanomaterials for soft and homogeneous siRNA loading and precise and visualized intracellular delivery

“…For better examination and comparison, the nanoparticles of WP5⊃G obtained by single hierarchical self-assembly without siRNA were also studied. First, isothermal titration calorimetry (ITC) 37 experiments were employed to examine the hierarchical self-assembly. Fig.…”

Photoprinting and expansion-induced erasure with supramolecular hydrogels crosslinked by pseudorotaxanation

“…[1][2][3][4] Photochromic materials that change color upon exposure to light have been applied to inkless printing, which provided intriguing potential for rewritable/erasable photo-printing. [5][6][7][8] However, the application of conventional photochromic materials comprising photochromic chromophores, such as azobenzene, diarylethene, and spiropyran, [9][10][11] for writable/erasable printing was limited by the poor color contrast. Moreover, some photo-generated colors have short lifetimes and simultaneously return to their initial color within a few minutes aer excitation, which results in the speedy vanishing of printed content in the background.…”

Supramolecular Polymers with Photoswitchable Multistate Fluorescence for Anti-Counterfeiting and Encryption

“…Supramolecular polymers have been extensively used to construct SFMs for various applications, such as displays, sensors, and information encryption, due to their excellent reversibility and sensitive responsiveness to external stimuli. − Moreover, abundant supramolecular interactions, including host–guest interactions, ligand–metal complexations, π–π stacking, ionic interactions, and hydrogen bonding (H-bonding), can not only offer flexibility for optical performance regulation but also possess excellent self-assembly ability and potential self-healing capacity. − Therefore, supramolecular polymers may serve as an ideal material platform for the construction of novel PMFS with more comprehensive properties. However, the feasibility of using supramolecular polymers and fluorescent photochromism to construct photoswitchable multistate fluorescent supramolecular polymers (PMFSPs) has not been explored.…”