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    Home > Chem. SCI.: controlled dynamic deformation of triplex interlocking coordination cable hydrocarbon

    Chem. SCI.: controlled dynamic deformation of triplex interlocking coordination cable hydrocarbon

    • Last Update: 2018-01-15
    • Source: Internet
    • Author: User
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    By learning and comprehending the chemical information of life systems, molecular recognition and self-assembly methods have been successfully used to construct artificial molecular machine systems Among them, molecules with mechanical binding structures (such as alkanes and multiple interlocked molecular bonds) have attracted the attention of researchers due to their unique topological structure For this reason, researchers have developed a template oriented method to control the topological structure of mechanical interlocking molecules by using non covalent interaction to form a winding or screw system of pre mixed synthetic blocks However, compared with the template method, in the aspect of reversible lock-in / unlock structure and dynamic control of optical, electronic and transmission properties of molecular machines, the industry still does not know much about how to integrate the self replication and recognition mediated processes of machines Chemists speculate that halophilic molecular knots can promote the occurrence of anion capture reaction, which can enhance the activity of "dehalogenase" (containing halide binding sites) and facilitate the breaking of carbon halide bonds Multiple interlocked connectors exhibit high stability and the ability to form different types of combined pockets (multiple objects of different sizes and shapes) In view of this, the cross-linked structure with positive and multiple coordination has great potential in selectively combining a large number of guest anions at the same time Various types of "molecular knot" structure sources: chem.soc Rev Through the collaborative combination of multi-component self-assembly and template oriented method, Professor Duan Chunying's team of Dalian University of Technology reported a new one pot construction method, using multiple blocks as raw materials, successfully constructed ternary interlocking coordination cable hydrocarbon molecular structure Molecule 8 (4-aminophenyl) amine, TPA and molecule 24 (2,2 '- bipyridine-5-formaldehyde) in the figure below form a chelator Zinc is used as cation and CF ₃₃₃₃⁻, OTF is used as template anion A hollow tetrahedral structure as shown in the figure below can be obtained through self-assembly This structure is called tet-1 Source: chem SCI If the template anion used is BF ₄⁻, clo ₄⁻⁻ or halogen ion, after self-assembly, it is triple interlocking hydrocarbon locking structure (as shown in the figure below), that is, two tetrahedral structures are interwoven in the form of interlocking This structure is called cat-x, and there are seven holes in it Source: chem SCI In the presence of a suitable template anion, the two configurations can be converted to each other Under the same condition of self-assembly, Zn (BF ₄) ψ is replaced by Zn (CF ₃ so ₃) ψ, which can be transformed from cat-x configuration to tet-1 configuration Adding clo ₄⁻to the system containing tet-1 configuration at room temperature can change the configuration into Cat clo ₄ Source: chem SCI Considering that seven holes in the interlocking hydrocarbon structure are likely to promote the dissociation process from the C-Br bond, that is, to capture br⁻from the C-Br bond and form carbon positive ions, the author of this paper applies this controllable dynamic deformation phenomenon to the brine extraction reaction (as shown in the figure below) Tet-1 was mixed with 3-bromocyclohexene, and then meotf was added After stirring for three hours, 2-cyclohexenol was obtained Cat br obtained by tet-1 (non interlock) seizing br ion reacts with meotf and generates methyl bromide gas, that is, the existence of meotf reduces cat br to tet-1, thus realizing catalytic cycle Source: chem SCI The capture / release switch cycle realized by gas overflow further proves the stability and reversibility of this controllable dynamic transformation process, and provides possible conditions for using this system as a dynamic molecular logic device Thesis link: http://pubs.rsc.org/en/content/article landing/2018/sc/c7sc04070a ා! Divabstract research group homepage: http://polyhedron.dlut.edu.cn/duan Chunying source: Duan Chunying research group website
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