An expanded neutral M4L6 cage that encapsulates four tetrahydrofuran molecules

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Metal-organic cages (MOCs) are constructed from metal ions and organic linkers.
• The self-assembly of MOCs allows for the creation of complex, porous structures.
• Bis-β-diketone ligands offer versatile coordination capabilities for metal ions.

Purpose of the Study:

• To synthesize and characterize a novel metal-organic cage.
• To investigate the structural properties and guest encapsulation abilities of the MOC.
• To explore the potential of bis-β-diketone ligands in constructing large MOCs.

Main Methods:

• A 4,4'-biphenylene-spaced bis-β-diketone ligand was synthesized.
• Self-assembly of the ligand with metal ions resulted in a tetrahedral M(4)L(6) metal-organic cage.
• X-ray crystallography was used to determine the cage structure and dimensions.
• Guest encapsulation was studied by analyzing the crystal structure.

Main Results:

• A neutral tetrahedral M(4)L(6) metal-organic cage was successfully formed.
• The cage possesses a large internal volume of 844 Å(3).
• Four tetrahydrofuran guest molecules were found to be encapsulated within the cage.

Conclusions:

• The bis-β-diketone ligand is effective in forming large, well-defined metal-organic cages.
• The synthesized MOC demonstrates significant guest encapsulation capacity.
• This work expands the library of MOCs with potential applications in host-guest chemistry.