Azo supramolecules on Au(111) with controlled size and shape.

Area of Science:

• Supramolecular chemistry
• Surface science
• Materials science

Background:

• Azobenzene derivatives are known for their photoresponsive properties.
• Controlling molecular assembly on surfaces is crucial for developing advanced materials.
• Intermolecular forces, such as hydrogen bonds, play a key role in supramolecular structure formation.

Purpose of the Study:

• To prepare supramolecules of azobenzene-related molecules on gold (Au) surfaces.
• To investigate the role of intermolecular C-H...N hydrogen bonds and molecule-surface interactions in the assembly process.
• To analyze the structure and properties of the formed supramolecules using computational methods.

Main Methods:

• Preparation of supramolecular assemblies using azobenzene-related molecules on Au surfaces.
• Utilizing a balance of weak intermolecular C-H...N hydrogen bonds and molecule-surface interactions for controlled assembly.
• Performing first-principles calculations for theoretical analysis and modeling of the supramolecular structures.

Main Results:

• Successful preparation of supramolecular structures of azobenzene derivatives on Au surfaces.
• Demonstration that a delicate balance between C-H...N hydrogen bonds and molecule-surface interactions governs the assembly.
• Computational modeling provided insights into the binding energies and structural configurations.

Conclusions:

• The study highlights the importance of non-covalent interactions in designing ordered molecular assemblies on surfaces.
• First-principles calculations are a valuable tool for understanding and predicting supramolecular behavior.
• This work contributes to the fundamental understanding of surface-confined molecular self-assembly.