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Complex k-uniform tilings by a simple bitopic precursor self-assembled on Ag(001) surface.

Lukáš Kormoš¹, Pavel Procházka¹, Anton O Makoveev¹

¹CEITEC - Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00, Brno, Czech Republic.

Nature Communications

|April 22, 2020

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Researchers engineered complex molecular tilings using 4,4'-biphenyl dicarboxylic acid (BDA) on a silver surface. This breakthrough enables the creation of previously unexplored k-uniform geometric structures for advanced material applications.

Area of Science:

Supramolecular Chemistry
Surface Science
Materials Science

Background:

Engineering long-range ordered structures in 2D is challenging.
On-surface chemistry has produced regular, semi-regular, quasicrystalline, and fractal tilings.
k-uniform tilings with multiple distinct vertices are underexplored.

Purpose of the Study:

To explore the synthesis of k-uniform tilings.
To investigate the use of 4,4'-biphenyl dicarboxylic acid (BDA) for creating complex geometries.
To define self-assembly criteria for novel supramolecular structures.

Main Methods:

Utilizing 4,4'-biphenyl dicarboxylic acid (BDA) as a molecular precursor.
Performing controlled chemical transformations on the Ag(001) surface.

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Analyzing the formation of 2- and 3-uniform tilings via partially carboxylated BDA.

Main Results:

Successfully prepared 2- and 3-uniform tilings from BDA.
Demonstrated that partially carboxylated BDA connects distinct binding motifs.
Achieved a single, long-range ordered molecular phase with complex geometry.

Conclusions:

BDA is a versatile precursor for complex supramolecular tilings.
Partially carboxylated BDA facilitates the formation of k-uniform structures.
This work establishes criteria for designing and utilizing advanced molecular assemblies.