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Isolating solvent-solute hydrogen bonding interactions via 2D IR solvation shell spectroscopy
Samuel Knight1,2, Nicholas H C Lewis1,2, Ian Bongalonta1,2
1James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA.
The Journal of Chemical Physics
|March 26, 2026
Summary
Ultrafast 2D IR spectroscopy reveals distinct solvation shell structures. This method isolates solvent molecules around a solute, showing stronger hydrogen bonds and specific orientations compared to bulk solvent.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Computational Chemistry
Background:
- The solvation shell is crucial for solution behavior but difficult to study experimentally.
- Bulk solvent signals often obscure the subtle solvation shell signals.
Purpose of the Study:
- To develop and apply a method for directly measuring solvation shell properties.
- To investigate the influence of solute structure on solvation shell dynamics and hydrogen bonding.
Main Methods:
- Utilizing ultrafast two-dimensional infrared (2D IR) spectroscopy.
- Analyzing intermolecular cross-peaks to isolate solvation shell spectra.
- Employing molecular dynamics simulations for detailed analysis.
Main Results:
- Isolated the IR absorption spectrum of methanol in the solvation shell of N-methylacetamide.
- Identified a low-frequency hydrogen-bonding mode mediating intermolecular coupling.
- Observed stronger, distinctly oriented hydrogen bonds in the solvation shell compared to bulk methanol.
- Compared solvation shells of N-methylacetamide and N,N-dimethylacetamide to assess solute structural effects.
Conclusions:
- 2D IR spectroscopy effectively probes solvation shells without bulk solvent interference.
- Hydrogen bonds in solvation shells exhibit unique properties influenced by solute structure.
- Anharmonic coupling mediated by hydrogen-bonding modes is significant in solutions.
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