Multiple Stimuli-Responsive Conformational Exchanges of Biphen[3]arene Macrocycle

Conformational exchanges of synthetic macrocyclic acceptors are rather fast, which is rarely studied in the absence of guests. Here, we report multiple stimuli-responsive conformational exchanges between two preexisting conformations of 2,2′,4,4′-tetramethoxyl biphen[3]arene (MeBP3) macrocycle. Stru...

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Published inMolecules (Basel, Switzerland) Vol. 25; no. 24; p. 5780
Main Authors Wang, Yiliang, Yang, Liu-Pan, Zhao, Xiang, Cui, Lei, Li, Jian, Jia, Xueshun, Fang, Jianhui, Li, Chunju
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 08.12.2020
MDPI
Subjects
conformational exchange
Hydrogen-Ion Concentration
Kinetics
macrocycle
Macrocyclic Compounds - chemistry
Magnetic Resonance Spectroscopy
Models, Molecular
Molecular Conformation
Molecular Structure
multiple stimuli-responsive
Solvents
Temperature
Temperature effects
macrocycle
conformational exchange
multiple stimuli-responsive
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ISSN1420-3049
1420-3049
DOI10.3390/molecules25245780

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Summary:Conformational exchanges of synthetic macrocyclic acceptors are rather fast, which is rarely studied in the absence of guests. Here, we report multiple stimuli-responsive conformational exchanges between two preexisting conformations of 2,2′,4,4′-tetramethoxyl biphen[3]arene (MeBP3) macrocycle. Structures of these two conformations are both observed in solid state, and characterized by 1H NMR, 13C NMR and 2D NMR in solution. In particular, conformational exchanges can respond to solvents, temperatures, guest binding and acid/base addition. The current system may have a role to play in the construction of molecular switches and other stimuli-responsive systems.
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These two authors contributed equally to this paper.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules25245780