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Mapping Hydration Water around Alcohol Chains by THz Calorimetry
Fabian Böhm1, Gerhard Schwaab1, Martina Havenith1
1Lehrstuhl für Physikalische Chemie 2, Ruhr-Universität Bochum, 44801, Bochum, Germany.
Terahertz spectroscopy reveals how alcohol chains alter water
Area of Science:
- Physical Chemistry
- Chemical Physics
- Spectroscopy
Background:
- Understanding solvation dynamics is crucial for chemical processes.
- Alcohol-water interactions influence hydrogen bond networks.
- Hydration shells around solutes impact molecular behavior.
Purpose of the Study:
- To investigate the role of hydration water in alcohol solvation using THz spectroscopy.
- To analyze the spectral components of water around alcohol chains.
- To correlate spectral changes with thermodynamic properties like heat capacity and free energy.
Main Methods:
- Terahertz (THz) spectroscopy to probe hydrogen bond network dynamics.
- Spectral decomposition into bulk, tetrahedral, and interstitial water components.
- Analysis of temperature-dependent spectral changes.
Main Results:
- THz spectra resolved into bulk, tetrahedral (195 cm⁻¹), and interstitial (164 cm⁻¹) water.
- Interstitial hydration water, not tetrahedral, drives temperature-dependent changes in heat capacity and free energy.
- Solute-specific free energy offset correlates linearly with alcohol chain length due to void formation.
Conclusions:
- Interstitial water plays a key role in the thermodynamics of alcohol solvation.
- Void formation contributes to the free energy changes upon solvation.
- THz spectroscopy provides insights into solute-water interactions and their thermodynamic consequences.
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