Solid-state hierarchical cyclodextrin-based supramolecular polymer constructed by primary, secondary, and tertiary...

Area of Science:

• Supramolecular Chemistry
• Crystal Engineering
• Polymer Science

Background:

• Cyclodextrins are versatile host molecules with applications in various fields.
• Azido groups are known to participate in various chemical interactions.
• Understanding self-assembly is crucial for designing advanced materials.

Purpose of the Study:

• To investigate the self-assembly behavior of di-azido-α-cyclodextrin.
• To elucidate the role of azido-type interactions in crystal formation.
• To explore the contribution of difunctionalization to supramolecular hierarchy.

Main Methods:

• Crystallization of di-azido-α-cyclodextrin.
• X-ray diffraction analysis to determine crystal structure.
• Analysis of intermolecular interactions within the crystal lattice.

Main Results:

• A polymeric self-assembly of di-azido-α-cyclodextrin was observed.
• The crystal structure is stabilized by a combination of azido inclusion, azido-azido, and azido-groove interactions.
• An unprecedented distribution of canonical forms was found in the azido-azido interactions.
• The second azido group significantly contributes to the overall supramolecular structure.

Conclusions:

• Di-azido-α-cyclodextrin self-assembles into a polymer via cooperative azido interactions.
• Difunctionalization is beneficial for creating hierarchical supramolecular structures.
• The study highlights the importance of azido-type interactions in crystal engineering.