A Dynamic Silver(I) Nanocluster Holds Together a 3 × 3 Self-Assembled Grid.

Area of Science:

• Coordination Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Metal ions act as fixed joints in self-assembled architectures, defining ligand orientations.
• Ion and ligand exchange in these structures typically requires significant disruption.
• Dynamic metal ions offer a potential route to more flexible self-assembled systems.

Purpose of the Study:

• To investigate dynamic metal-organic grid-like structures with mobile metal ions.
• To explore the role of halide anions in controlling ion mobility and assembly dynamics.
• To establish a new method for using dynamic nanoclusters in coordination-driven self-assembly.

Main Methods:

• Synthesis of Ag(I)12X4L6 3x3 metal-organic grid structures.
• Variable temperature studies to monitor silver ion exchange kinetics.
• Halide exchange experiments to probe activation barriers.

Main Results:

• A series of Ag(I)12X4L6 3x3 metal-organic grids with a dynamic core nanocluster were synthesized.
• Silver ions were observed to move between binding sites, inducing ligand conformational changes while maintaining grid positions.
• The halide anion identity was found to control the activation barrier for silver ion exchange, allowing for tunable kinetics.
• Rate control was achieved by altering temperature or by halide anion exchange.

Conclusions:

• Dynamic silver nanoclusters within metal-organic grids offer a novel approach to coordination-driven self-assembly.
• The mobility of silver ions in these grids is analogous to silver atoms in surface-bound clusters and nanoparticles.
• The developed kinetic analysis provides insights into dynamic metal nanoclusters and could guide future self-assembly designs.