An open hollow polyoxovanadate cage based on {Nb(V₅)} pentagons with size-selective encapsulation properties

Area of Science:

• Inorganic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Polyoxovanadates (POVs) are versatile inorganic clusters with tunable structures and properties.
• Developing novel POV architectures for specific ion recognition and molecular encapsulation remains a key challenge.

Purpose of the Study:

• To synthesize and characterize a new open hollow polyoxovanadate (POV) cage, V14Nb2P8.
• To investigate the selective coordination capabilities of the POV cage with cesium ions (Cs+).
• To explore the potential of the POV cage as a molecular container for organic molecules.

Main Methods:

• Utilizing {Nb(V5)} pentagons as building blocks for cage construction.
• Characterization of the V14Nb2P8 structure and properties.
• Investigating the ion-coordination behavior with Cs+ ions.
• Assessing the encapsulation of organic molecules within the hollow cavity.

Main Results:

• Successful construction of the V14Nb2P8 open hollow POV cage.
• The cage exhibits a crown-ether-like {V4P4O8} opening.
• Demonstrated selective coordination of the POV cage with Cs+ ions.
• The hollow cavity effectively accommodates size-appropriate organic molecules.

Conclusions:

• The V14Nb2P8 POV cage represents a novel material with potential applications in ion separation and molecular encapsulation.
• The unique structural features, including the selective Cs+ binding site and hollow cavity, offer opportunities for targeted molecular recognition and storage.