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Rigidified Cavitand Hosts in Water: Bent Guests, Shape Selectivity, and Encapsulation
Ji-Min Yang1, Yong-Qing Chen2, Yang Yu2
1Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.
Journal of the American Chemical Society
|November 11, 2021
Summary
Two novel water-soluble cavitand hosts were synthesized with rigidified ends. These container compounds selectively bind various guests, including alkanes, hydrophilic compounds, and isomers, enabling separation applications.
Area of Science:
- Supramolecular Chemistry
- Organic Synthesis
- Host-Guest Chemistry
Background:
- Cavitands are macrocyclic compounds known for their ability to encapsulate guest molecules.
- Modifying cavitand structures can alter their binding properties and solubility.
- Rigidified open ends can preorganize cavitands into specific conformations for guest recognition.
Purpose of the Study:
- To synthesize and characterize novel water-soluble cavitand hosts with preorganized, rigidified structures.
- To investigate the binding affinities and selectivity of these cavitands towards various guest molecules.
- To explore potential applications of these cavitands in separation processes.
Main Methods:
- Synthesis of two distinct water-soluble cavitands featuring different bridging units ((CH2)4 and CH2CH2OCH2CH2).
- Characterization of the synthesized cavitands using spectroscopic and analytical techniques.
- Binding studies with a range of guests including cycloalkanes, n-alkanes, hydrophilic compounds, and isomers.
Main Results:
- The synthesized cavitands adopt vase-like conformations due to the rigidifying spacers.
- 1:1 complexation observed with small alkanes and cycloalkanes, with free movement within the cavity.
- Selective binding and complexation observed for various guests, including isomers and long-chain diols/diamines, leading to capsule or U-shaped conformations.
- The cavitand with ether linkages demonstrated utility in separating o-xylene from isomers via extraction.
Conclusions:
- The designed spacers effectively preorganize the cavitands, enhancing their host properties.
- The new cavitands exhibit tunable binding capabilities and selectivity for diverse guest molecules.
- These water-soluble cavitands show promise for applications in molecular recognition and separation technologies.
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