Hierarchical self-assembly system based on excitation wavelength regulation of multicolor luminescent object molecules and cucurbita

On August 9, 2022, the team of Academician Li Quan, dean of the Institute of Intelligent Materials Research at Southeast University and academician of the School of Chemistry and Chemical Engineering, published an article in the Journal of Matter entitled “Hierarchical self-assembly of an excitation-wavelength-dependent emissive fluorophore and cucurbiturils for secondary.” encryption” research results.

The research group reported a host-object-level self-assembly system induced by cucurbitium, which realized the hierarchical assembly change from nanoparticles, nanostrips, nanosheets to micron-level polyhedra by simply adjusting the bonding ratio of host-guest molecules, and realized multicolor luminescence regulated by excitation wavelength regulation, which was then used for secondary information encryption. The corresponding authors of the paper are Li Quan, Yang Hong, Chen Xuman; The first author is Chen Xiao.

Hierarchical self-assembly systems are the basic material construction methods in nature, such as proteins and DNA and other living substances, which are high-level tissue structures with certain life functions formed by simple compounds through multi-level assembly of non-covalent action. Simulating this naturally occurring material construction method to create a substance with a complex multi-level structure and giving it a specific function is an opportunity in the research and development of synthetic intelligent materials, and it is also a serious challenge in the research of intelligent materials. Therefore, functionalized supramolecular-level self-assembly systems have great potential for development. However, there is currently less coverage of related areas of research.

Li Quan’s team used a multi-color luminescent molecule with excitation light dependence to co-assemble with the macrocyclic molecule cucurbidurea in aqueous solution to construct a supramolecular self-assembly system with light-controlled multicolor luminescence. By cleverly controlling the addition of two components, the bonding model of controlling the multi-level bonding model of the object molecule and the gourd urea is achieved, and then the assembly mode and morphology of the assembly are regulated, so that the assembly morphology of the system can achieve multi-level changes of “point”, “line”, “surface” and “body”, and the change of morphology has brought about the change of the luminous color of the system. Through the combination of luminous molecules and supramolecular level self-assembly systems, as well as changing the way of excitation light, the luminous color can be enriched, and the multi-color luminescence that almost covers the full visible light area such as blue, white, yellow, and orange can be realized. Then, by designing a multi-colored fluorescent pattern that depends on the excitation wavelength, the system can be used for secondary information encryption, that is, by changing the excitation light wavelength to transmit true and false information, to achieve the purpose of information camouflage. This study provides a feasible strategy for the research of supramolecular multi-stage assembly system, dynamic nano-assembly system and intelligent anti-counterfeiting system.

The research work has been funded by the “Double Creation Team” program of Jiangsu Province and the National Natural Science Foundation of China. (Source: Science Network)

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