Unraveling Dynamic Helicity Inversion and Chirality Transfer through the Synthesis of Discrete Azobenzene Oligomers by an Iterative Exponential Growth Strategy
Xiao Wang1, Zhihong Yu1, Zhihao Huang1, Nianchen Zhou1, Xiaoxiao Cheng1*(程笑笑), Zhengbiao Zhang1,2*(张正彪), Wei Zhang1*(张伟), Xiulin Zhu1
1Stateand LocalJoint EngineeringLaboratoryfor NovelFunctionalPolymericMaterials,JiangsuKey Laboratoryof AdvancedFunctionalPolymerDesignand Application,Collegeof Chemistry,ChemicalEngineeringand MaterialsScience,SoochowUniversitySuzhou,215123(China)
2StateKey Laboratoryof RadiationMedicineand Protection,SoochowUniversitySuzhou,215123(China)
Angew. Chem.Int. Ed.2024,63,e202315686(1 of 12)
Abstract:Unraveling the chirality transfer mechanism of polymer assemblies and controlling their handedness is beneficial for exploring the origin of hierarchical chirality and developing smart materials with desired chiroptical activities. However, polydisperse polymers often lead to an ambiguous or statistical evaluation of the structure-property relationship, and it remains unclear how the iterative number of repeating units function in the helicity inversion of polymer assemblies. Herein, we report the macroscopic helicity and dynamic manipulation of the chiroptical activity of supramolecular assemblies from discrete azobenzene-containing oligomers (azooligomers), together with the helicity inversion and morphological transition achieved solely by changing the iterative chain lengths. The corresponding assemblies also differ from their polydisperse counterparts in terms of thermodynamic properties, chiroptical activities, and morphological control.
链接：https://onlinelibrary.wiley.com/doi/10.1002/anie.202315686
