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• W2743492012 abstract "This study explores the thermodynamic and vibrational properties of water in the three-dimensional environment of solvated ions and small molecules using molecular simulations. The spectrum of intermolecular vibrations in liquid solvents provides detailed information on the shape of the local potential energy surface, which in turn determines local thermodynamic properties such as the entropy. Here, we extract this information using a spatially resolved extension of the two-phase thermodynamics method to estimate hydration water entropies based on the local vibrational density of states (3D-2PT). Combined with an analysis of solute–water and water–water interaction energies, this allows us to resolve local contributions to the solvation enthalpy, entropy, and free energy. We use this approach to study effects of ions on their surrounding water hydrogen bond network, its spectrum of intermolecular vibrations, and resulting thermodynamic properties. In the three-dimensional environment of polar and nonpolar functional groups of molecular solutes, we identify distinct hydration water species and classify them by their characteristic vibrational density of states and molecular entropies. In each case, we are able to assign variations in local hydration water entropies to specific changes in the spectrum of intermolecular vibrations. This provides an important link for the thermodynamic interpretation of vibrational spectra that are accessible to far-infrared absorption and Raman spectroscopy experiments. Our analysis provides unique microscopic details regarding the hydration of hydrophobic and hydrophilic functional groups, which enable us to identify interactions and molecular degrees of freedom that determine relevant contributions to the solvation entropy and consequently the free energy." @default.
• W2743492012 created "2017-08-17" @default.
• W2743492012 creator A5020941647 @default.
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• W2743492012 date "2017-08-25" @default.
• W2743492012 modified "2023-10-18" @default.
• W2743492012 title "Signatures of Solvation Thermodynamics in Spectra of Intermolecular Vibrations" @default.
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• W2743492012 doi "https://doi.org/10.1021/acs.jctc.7b00184" @default.
• W2743492012 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5607457" @default.
• W2743492012 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28783431" @default.
• W2743492012 hasPublicationYear "2017" @default.
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