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Structure, conformation, and dynamics of P,N-containing cyclophanes in solution
Shamil K Latypov1, Artem V Kozlov, Evamarie Hey-Hawkins
1A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str. 8, Kazan, 420088, Russian Federation. lsk@iopc.knc.ru
Highly symmetrical N,P-containing macrocycles adopt helical structures in solution. Their conformation and cavity size are influenced by steric hindrance, enabling them to host aromatic guests.
Area of Science:
- Supramolecular Chemistry
- Organic Chemistry
- Physical Chemistry
Background:
- Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for elucidating molecular structures.
- Macrocyclic compounds offer unique host-guest chemistry possibilities.
- Understanding conformational dynamics in solution is key to predicting molecular behavior.
Purpose of the Study:
- To determine the 3D solution structures of novel N,P-containing macrocycles.
- To investigate the conformational preferences and host-guest properties of these symmetrical macrocycles.
- To explore the influence of substituents on macrocyclic conformation and cavity formation.
Main Methods:
- Utilized various 2D NMR correlation techniques for structural elucidation.
- Employed NMR diffusion measurements to quantify magnetically equivalent fragments.
- Analyzed steric hindrance effects of aromatic substituents on phosphorus atoms.
Main Results:
- Established the helical conformation of the macrocycles in solution.
- Demonstrated that steric hindrance dictates macrocycle twisting and cavity size.
- Confirmed the ability of these macrocycles to encapsulate aromatic guests within their cavities.
Conclusions:
- The study provides detailed insights into the solution-state structural and conformational properties of N,P-macrocycles.
- Steric interactions of exocyclic substituents play a critical role in defining the macrocyclic architecture.
- These macrocycles show potential for applications in host-guest chemistry and molecular recognition.
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