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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Published on: August 2, 2012

Achieving chiral resolution in self-assembled supramolecular structures through kinetic pathways.

Jong Keon Yoon¹, Won-joon Son, Howon Kim

¹Department of Physics, Korea University, 1-5 Anam-dong, Seongbuk-gu, 136-713, Seoul, Korea.

|May 21, 2011

Summary

Researchers explored chiral phase transitions in 2,6-dibromoanthraquinones supramolecular systems. They observed that heterochiral structures are more stable than homochiral ones due to specific bonding, enabling chiral resolution through kinetic pathways.

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Published on: February 15, 2016

Area of Science:

Supramolecular Chemistry
Surface Science
Chirality Studies

Background:

Self-assembled 2,6-dibromoanthraquinones on Au(111) surfaces exhibit complex structural behavior.
Understanding chiral phase transitions is crucial for molecular self-assembly and materials science.

Purpose of the Study:

To investigate chiral phase transitions in 2,6-dibromoanthraquinones supramolecular systems.
To elucidate the structural stability and formation mechanisms of different chiral phases.
To explore the potential for chiral resolution in supramolecular systems.

Main Methods:

Scanning tunneling microscopy (STM) was employed to observe molecular structures.
Ab initio studies were used to support proposed molecular models.
Variable temperature studies (150 K, 300 K, 80 K) were performed to induce and analyze phase transitions.

Main Results:

Initially deposited molecules formed heterochiral chevron structures (racemate).
Warming and cooling cycles led to phase-separated homochiral structures (conglomerate) alongside chevron structures.
Heterochiral chevron structures were found to be more stable due to additional halogen bonds.

Conclusions:

Hydrogen and halogen bonds play a key role in stabilizing supramolecular structures.
A disordered liquid phase at 300 K facilitates kinetic pathways for phase transitions.
Exploiting kinetic paths in supramolecular systems offers a method for achieving chiral resolution.