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Published on: April 8, 2020
Controlling interfacial interactions of supramolecular assemblies by light-responsive overcrowded alkenes
Zhao-Tao Shi1, Jing-Jing Yu, Qi Zhang
1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China. dahui_qu@ecust.edu.cn.
Researchers developed a light-responsive supramolecular polymer using a novel monomer. This polymer
Area of Science:
- Supramolecular chemistry
- Polymer science
- Materials science
Background:
- Supramolecular polymers offer dynamic and responsive material properties.
- Controlling self-assembly through external stimuli is crucial for advanced materials.
Purpose of the Study:
- To construct a light-responsive supramolecular polymer.
- To investigate the light-induced transformation between primary and secondary assemblies.
Main Methods:
- Synthesis of an AB-type monomer incorporating an overcrowded alkene.
- Characterization of supramolecular polymer formation and self-assembly.
- Utilizing light stimuli to trigger structural changes.
Main Results:
- Successful construction of a light-responsive supramolecular polymer.
- Demonstration of secondary self-assembly via host-guest interactions.
- Light-induced conversion from secondary to discrete primary assemblies.
Conclusions:
- The developed supramolecular polymer exhibits tunable self-assembly.
- Light stimuli provide effective control over polymer architecture.
- Potential applications in responsive materials and nanotechnology.
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Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
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Doubly bonded carbons are sp2 hybridized and have a trigonal planar geometry. The double bond is composed of a σ bond formed by the overlap of hybrid orbitals and a π bond produced by the lateral overlap of unhybridized 2p orbitals on both the carbons. Each carbon atom is...

