A 36-Membered Ring Metal Chalcogenide with a Very Low Framework Density.

Area of Science:

• Materials Science
• Inorganic Chemistry
• Crystal Engineering

Background:

• Open-framework metal chalcogenides are important functional materials.
• Designing materials with large-pore channels is a key challenge in materials synthesis.
• Understanding structure-property relationships is crucial for targeted applications.

Purpose of the Study:

• To report the synthesis and characterization of a new open-framework metal chalcogenide.
• To investigate the structural features, including channel size and framework topology.
• To explore the ion-exchange properties of the material.

Main Methods:

• Single-crystal X-ray diffraction for structure determination.
• Powder X-ray diffraction for phase purity analysis.
• Energy-dispersive X-ray spectroscopy for elemental composition.
• Ion-exchange experiments using Cs+ ions.

Main Results:

• A novel open-framework metal chalcogenide with extra-large 36-ring channels was synthesized.
• The framework exhibits a 3-connected etc topology, built from supertetrahedral T2 clusters.
• The material possesses a very low framework density (3.4 tetrahedra per 1000 ų).
• Partial exchange of organic cations with Cs+ ions was achieved without framework collapse.

Conclusions:

• The discovery of this new material expands the library of open-framework metal chalcogenides.
• The large channels and tunable nature suggest potential applications in separation and catalysis.
• The stability of the framework under ion-exchange conditions highlights its robustness.