Anion Pairs Template a Trigonal Prism with Disilver Vertices

Area of Science:

• Supramolecular Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Subcomponent self-assembly is a powerful strategy for constructing complex molecular architectures.
• Traditional polyhedral cages often feature single metal centers as vertices.
• Developing novel cage structures with unique metal arrangements is an ongoing challenge.

Purpose of the Study:

• To report the formation of a novel trigonal prismatic cage structure.
• To investigate the use of 2-formyl-1,8-naphthyridine subcomponents for metal binding.
• To explore the encapsulation of anionic templates within the cage.

Main Methods:

• Subcomponent self-assembly using 2-formyl-1,8-naphthyridine.
• Coordination of silver(I) ions to form a cage structure.
• Crystallographic analysis and solution-phase studies to characterize the cage and its guests.

Main Results:

• Successful formation of a trigonal prismatic cage with bimetallic silver(I) vertices.
• Demonstration that the cage self-assembles around anionic templates.
• Identification of various anions, including elongated dianions like peroxysulfate, as competent guests.
• Crystallographic and solution data confirm template binding within the central cavity.

Conclusions:

• This work introduces a new class of polyhedral structures with bimetallic vertices.
• The strategy of using subcomponents with multiple binding sites can lead to higher-order structures.
• The described cage system offers a versatile platform for anion binding and encapsulation.