Chiral molecular imprinting in liquid-crystalline network.

Area of Science:

• Polymer Chemistry
• Materials Science
• Chirality Studies

Background:

• Chiral recognition is crucial in various scientific fields.
• Developing materials with specific chiral recognition capabilities is an ongoing challenge.
• Imprinted polymers offer a promising route to create selective molecular recognition sites.

Purpose of the Study:

• To synthesize a cholesteric imprinted elastomer using a nematic polysiloxane and a chiral template.
• To investigate the imprinting of both molecular and supramolecular chirality within the polymer network.
• To evaluate the stereoselective rebinding capacity of the imprinted elastomer.

Main Methods:

• Cross-linking a nematic side-chain polysiloxane around a chiral template via hydrogen bonding.
• Removal of the chiral template by washing to create imprinted cavities.
• Macroscopic orientation of the polymer during synthesis.
• Batch rebinding experiments using the template and its enantiomer.

Main Results:

• A cholesteric imprinted elastomer with topologically imprinted molecular and supramolecular chirality was successfully synthesized.
• The imprinted polymer exhibited significant stereoselectivity, preferentially binding the template enantiomer.
• The rebinding capacity of the imprinted mesogenic network surpassed that of unimprinted and non-mesogenic imprinted networks.

Conclusions:

• The developed method effectively creates chiral imprinted elastomers with dual-level chirality.
• The imprinted elastomer demonstrates high enantiomeric selectivity, making it suitable for chiral separation applications.
• This work contributes to the advancement of advanced functional materials for molecular recognition.