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

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Published on: March 24, 2018

Electrochemically driven interfacial halogen bonding on self-assembled monolayers for anion detection.

Hussein Hijazi¹, Antoine Vacher, Sihem Groni

¹Laboratoire d'Electrochimie Moléculaire, UMR CNRS 7591, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205 Paris Cedex 13, France. claire.fave@univ-paris-diderot.fr bernd.schollhorn@univ-paris-diderot.fr.

Chemical Communications (Cambridge, England)

|January 29, 2019

Summary

Researchers quantitatively studied electrochemically driven interfacial halogen bonding between redox-active self-assembled monolayers (SAMs) and halide anions. Halogen bonding was switched on electrochemically, showing enhanced binding compared to homogeneous systems.

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Area of Science:

Electrochemistry
Supramolecular Chemistry
Surface Science

Background:

Halogen bonding is a non-covalent interaction crucial in molecular recognition and self-assembly.
Controlling halogen bonding at interfaces is challenging but offers unique applications.
Redox-active self-assembled monolayers (SAMs) can be functionalized to modulate interfacial properties.

Purpose of the Study:

To quantitatively investigate electrochemically driven interfacial halogen bonding for the first time.
To explore the switching of halogen bond donor properties via electrochemical control.
To compare interfacial halogen bonding with homogeneous systems.

Main Methods:

Utilized redox-active SAMs on electrode surfaces.
Employed electrochemical methods to control the oxidation state of adsorbates.
Combined experimental techniques with computational simulations.

Main Results:

Demonstrated electrochemically controlled activation of halogen bond donor properties in SAMs.
Quantitatively studied the interaction between SAMs and halide anions at the interface.
Observed significantly enhanced binding of halide anions at the interface compared to homogeneous conditions.

Conclusions:

Interfacial halogen bonding can be effectively controlled electrochemically.
Redox-state switching provides a powerful mechanism to modulate halogen bonding strength.
This work opens new avenues for designing responsive interfacial systems.