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Spatial Separation of Molecular Conformers and Clusters
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Cluster Formation and Phase Transitions Induced by Vibrational Strong Coupling
K Sandeep1,2, S Swaminathan1, A Jayachandran1
1University of Strasbourg, CNRS, ISIS & icFRC, 8 allée Gaspard Monge, Strasbourg, 67000, France.
Angewandte Chemie (International Ed. in English)
|November 3, 2025
Summary
Vibrational strong coupling (VSC) enhances light scattering in liquids like toluene and water by two orders of magnitude. This effect is linked to a new VSC phase, impacting molecular processes.
Area of Science:
- Chemical Physics
- Materials Science
- Spectroscopy
Background:
- Vibrational strong coupling (VSC) is known to alter molecular and material properties.
- Understanding VSC's influence on bulk properties is crucial for its applications.
Purpose of the Study:
- To investigate the effect of VSC on non-resonant Rayleigh scattering in liquid-phase molecules.
- To explore the nature and behavior of the VSC-induced phase.
Main Methods:
- Non-resonant Rayleigh scattering measurements on liquid samples (toluene, water).
- Inducing VSC by coupling vibrational bands in the infrared (IR) region.
- Investigating the VSC phase transition with varying temperature and solvent composition.
Main Results:
- Rayleigh scattering enhanced by approximately two orders of magnitude in the visible spectrum.
- Enhanced scattering attributed to the formation of a new phase, potentially clusters.
- The VSC phase exhibits a distinct transition behavior dependent on temperature and solvent.
Conclusions:
- VSC significantly enhances light scattering in liquids.
- A novel VSC phase forms, influencing scattering properties.
- This phenomenon has implications for chemical reactivity and self-assembly processes.
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