Two-Dimensional Frameworks Based on Ag(I)-N Bond Formation: Single Crystal to Single Molecular Sheet Transformation

Area of Science:

• Materials Science
• Inorganic Chemistry
• Crystallography

Background:

• Coordination framework materials offer tunable properties for diverse applications.
• Silver(I) ions are versatile building blocks in constructing coordination networks.
• Understanding structure-property relationships is crucial for designing advanced materials.

Purpose of the Study:

• To synthesize and characterize novel two-dimensional coordination framework materials based on Ag(I)-N bonds.
• To investigate the structural diversity and topological features of the synthesized frameworks.
• To explore the potential of these materials for exfoliation and surface functionalization.

Main Methods:

• Single crystal X-ray diffraction for structural characterization.
• Synthesis of coordination frameworks using silver salts and a poly-monodentate bridging ligand (L1).
• Atomic force microscopy (AFM) to analyze exfoliated material morphology and deposition.

Main Results:

• Three new 2D coordination framework compounds (1, 2, and 3) were successfully synthesized and structurally elucidated.
• The frameworks exhibit distinct net topologies: 3^6.4^6.5^3 for compounds 1 and 2, and 4^4.6^2 for compound 3.
• Solvent-based exfoliation of compound 3 yielded large, micrometer-squared flakes that form single-molecule sheets on oxide surfaces, as confirmed by AFM.

Conclusions:

• The Ag(I)-N bond formation provides a viable route to novel 2D coordination frameworks with diverse topologies.
• The lability of Ag(I)-N bonds facilitates the exfoliation of these materials into single-molecule sheets.
• The ability to deposit these sheets on surfaces highlights their potential for applications in surface science and nanotechnology.