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An S4-Symmetrical Multi-Macrocyclic Nanohoop Derived from a 1,3-Alternate Calix[4]arene Core
Kunshan Xue1, Jia-Nan Gao1, Yu Qiu2
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry; School of Future Technology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China.
None:
Combining conjugated paraphenylene macrocycles with other functional macrocyclic units presents a promising approach for expanding the structural and functional diversity of multi-macrocyclic molecules. Herein, we report a macrocyclic nanohoop with S4 symmetry, composed of a 1,3-alternate calix[4]arene core and two oligo(paraphenylene) segments. Structurally, this macrocycle features interconnected cavities, and functionally, it inherits the fluorescence of the paraphenylene frameworks and the ion-binding capability of calixarenes. Remarkably, this macrocycle exhibits selective fluorescence responses toward potassium and uranyl ions. Theoretical calculations further reveal the nature of the noncovalent interactions for metal ion recognition.
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