On-Surface-Assembled Single-Layer Metal-Organic Frameworks with Extended Conjugation.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Single-layer conjugated metal-organic frameworks (SL-cMOFs) possess electronic bands conducive to high conductivity and non-trivial quantum phases.
• On-surface coordination self-assembly is a key experimental technique for realizing SL-cMOFs.
• The inherent tunability of coordination assembly allows for diverse geometric designs of SL-cMOFs.

Purpose of the Study:

• To review recent experimental progress in the on-surface synthesis of SL-cMOFs.
• To discuss the characterization of band structures in these materials.
• To highlight SL-cMOFs with Kagome lattices and their structural design principles.

Main Methods:

• Focus on on-surface coordination self-assembly for SL-cMOF synthesis.
• Characterization of electronic band structures.
• Categorization of synthesized SL-cMOFs into M3L2, M2L3, and M3L types based on metal (M) and ligand (L) ratios.

Main Results:

• Overview of achieved SL-cMOFs via on-surface synthesis, with emphasis on Kagome lattices.
• Detailed discussion of M3L2, M2L3, and M3L MOF categories.
• Demonstration of experimental realization and band structure characterization.

Conclusions:

• On-surface synthesis provides a versatile platform for designing and fabricating SL-cMOFs.
• Significant advances have been made in understanding and creating these materials.
• Future research directions and current challenges in SL-cMOF development are identified.