Intramolecular hydrogen bonding in calixarenes

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Host-Guest Chemistry

Background:

• Constructing molecular cavities for recognition and catalysis typically involves covalent synthesis or intermolecular self-assembly.
• Intramolecular hydrogen bonding offers an alternative strategy to direct the formation and properties of molecular cavities.
• Calixarenes are key building blocks in supramolecular chemistry, known for their cavity-containing structures.

Purpose of the Study:

• To explore the role of intramolecular hydrogen bonding in the formation and function of molecular cavities.
• To discuss the application of this principle in the design of host molecules, particularly calixarene derivatives.
• To highlight how hydrogen bonding influences preorganization and binding capabilities of host molecules.

Main Methods:

• Review of established supramolecular chemistry principles.
• Analysis of case studies involving calixarenes and derived receptor molecules.
• Discussion of molecular design strategies incorporating intramolecular hydrogen bonding.

Main Results:

• Intramolecular hydrogen bonding, when strategically placed, is crucial for the formation and preorganization of molecular cavities.
• This approach enhances the binding ability of host molecules by controlling their conformation.
• Calixarenes serve as excellent platforms for demonstrating the utility of intramolecular hydrogen bonding in host-guest chemistry.

Conclusions:

• Intramolecular hydrogen bonding is a powerful tool for the rational design of molecular cavities.
• It enables precise control over cavity formation, preorganization, and guest binding affinity.
• The principles discussed are broadly applicable to the development of advanced supramolecular receptors and catalysts.