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Updated: Jun 22, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Published on: March 24, 2018

On-Surface Molecular Recognition Driven by Chalcogen Bonding.

Luca Camilli¹, Conor Hogan^2,1, Deborah Romito³

¹Department of Physics, University of Rome "Tor Vergata", via della Ricerca Scientifica 1, 00133 Roma, Italy.

|June 28, 2024

Summary

This summary is machine-generated.

Chalcogen bonding interactions (ChBIs) enable molecular self-assembly on surfaces for the first time. Pyrenyl derivatives form chiral dimers on gold via specific Ch···N bonds, demonstrating controlled on-surface recognition.

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Published on: March 1, 2020

Area of Science:

Supramolecular chemistry
Surface science
Materials chemistry

Background:

Chalcogen bonding interactions (ChBIs) are crucial for creating ordered assemblies in various states.
The potential of ChBIs for engineering molecular self-assembly on surfaces remains largely unexplored.

Purpose of the Study:

To demonstrate for the first time that ChBIs can govern molecular self-assembly on surfaces.
To investigate the role of specific molecular designs in achieving ordered on-surface assemblies via ChBIs.

Main Methods:

Utilized scanning tunneling microscopy (STM) to visualize on-surface molecular arrangements.
Employed ab initio calculations to understand the underlying interaction mechanisms.
Synthesized and studied pyrenyl derivatives with chalcogenazolo pyridine motifs and reference compounds.

Main Results:

Achieved the first demonstration of on-surface molecular recognition solely driven by ChBIs.
Observed noncovalent chiral dimerization of a pyrenyl derivative on the Au(111) surface.
Identified double Ch···N interactions involving Te- or Se-containing chalcogenazolo pyridine motifs as the key interaction.

Conclusions:

Chalcogen bonding interactions are effective in directing molecular self-assembly on surfaces.
The presence of the pyridyl moiety in chalcogenazolo pyridine derivatives is essential for forming regular, ordered on-surface assemblies.
This work opens new avenues for designing functional molecular architectures on surfaces using ChBIs.