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    Home > Construction of solid-phase molecular machine for four-dimensional information code by thermally activated carbon rich macrocyclic molecular receptor

    Construction of solid-phase molecular machine for four-dimensional information code by thermally activated carbon rich macrocyclic molecular receptor

    • Last Update: 2020-02-03
    • Source: Internet
    • Author: User
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    In recent years, carbon rich macrocyclic molecules have attracted great attention due to their special topological structure, band characteristics and photoelectric properties The synthesis of carbon rich macrocyclic molecules with specific structures and functions has become one of the hot and difficult issues in synthesis chemistry, host guest chemistry and materials science However, the study of carbon rich macrocycles as molecular receptors is relatively rare The study on the regulation of the fixed conformation of such macrocycles and the regulation of their molecular recognition performance is still blank Recently, Gong Hanyuan research group of Beijing Normal University designed and synthesized the carbon rich macrocycle system cyclo [8] (1,3 - (4,6-dimethyl) - benzene; cdmb-8 Cdmb-8 synthesized directly by solution method has a rigid c s conformation, and the irreversible change from C s conformation to D 4D conformation with high symmetry can be realized by solid-phase high-temperature heating under the protection of argon D4d-cdmb-8 has the molecular recognition performance of fullerene C60 and C70 which is not possessed by "parent" macrocycle cs-cdmb-8 It can realize the separation and purification of fullerenes in the mixture of fullerenes and even in the extraction solution of soot In this study, the irreversible change from the rigid conformation of the macrocycle to another rigid conformation was realized for the first time by means of heating, which showed the potential application prospect of thermal activation strategy in the field of molecular receptor structure and performance modification, and also provided a new idea for the application research of CMPs like carbon rich macrocycle compounds (chem Commun 2019, 55, 3701-3704) On the basis of the above research, the research group has obtained d4d-cdmb-8 and perylene based host guest composite solid fluorescent materials (NAT commun., 2020, DOI: 10.1038 / s41467-019-13844) with carbon and hydrogen elements only Under the action of solvent molecules, these materials can realize the transformation between the eutectic state and the mixed crystal state, and with the significant change of fluorescence At the same time, the near saturated vapor of different solvent molecules at room temperature makes the above transformation have significant time scale difference In essence, the change of structure and luminescent properties is that the solvent molecules regulate the molecular movement of the host guest complex in the solid phase, while the molecular movement between the host guest eutectic mixed crystal and the amorphous mixed crystal involved in the study is a new mode of molecular movement in the solid phase Based on this time-dependent fluorescence discoloration of solvent molecular vapor, a four-dimensional information coding system with time dimension is constructed for the first time, and multiple time-dependent dynamic information coding and intelligent reading are realized The dynamic control of host guest solid phase molecular motion and the corresponding control of luminescent properties developed by the Institute provide a new idea for the application of host guest self-assembled materials in the fields of gas-induced fluorescence color change, information storage and anti-counterfeiting Thanks for the guidance and help of academician Tang benzhong of Hong Kong University of science and technology and Professor Jonathan L Sessler (distinguished professor of Shanghai University) of University of Texas Austin Relevant research work has been supported by NSFC 973 program, basic scientific research fund of Central University, Beijing Municipal Education Commission, Beijing National Molecular Science Laboratory (BNLMS) and Beijing Normal University have provided financial support At the same time, we also thank Shanghai University, Robert A Welch foundation, Hong Kong research funding Bureau of China, innovation and technology administration and Shenzhen Science and technology program for their support and help Beijing Normal University is the first unit, and Yang Yudong, a doctoral student, is the first author.
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