Preferential Solvation Phenomena as Solute-Induced Structure-Making/Breaking Processes: Linking Thermodynamic Preferential Interaction Parameters to Fundamental Structure Making/Breaking Functions.

In this work, we identify the explicit macroscopic-to-microscopic rigorous links between existing thermodynamic preferential interaction parameters ΓQαQβ(χi) and microstructural descriptors based on total correlation function integrals, leading to their unambiguous characterization in terms of fundamental structure making/breaking functions Sαβ. First, we provide the statistics mechanical framework to identify a universal molecular-based signature for the preferential solvation PS phenomenon involving solutes at infinite dilution in mixed-solvent environments and discuss its fundamental properties. Then, we characterize the Sαβ functions relevant to the PS process, identify the microscopic markers for the existing preferential interaction parameters ΓQαQβ(χi) in terms of the Sαβ functions, and test their compliance with a pair of essential microstructural constraints linked to the properties of the universal PS signature. Moreover, we illustrate the analysis by probing the behavior of a representative ternary system comprising the solubility of methane in aqueous 1,4-dioxane mixed-solvent environments under ambient conditions. Finally, we discuss some relevant issues surrounding the statistical mechanical (microstructural) interpretation of the thermodynamic (macroscopic) preferential interaction parameters, review some pitfalls in their evaluation from molecular simulation, and provide an outlook.

• Publication year

  2024

• Venue

  Journal of Physical Chemistry B

• Publication date

  2024-05-16

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.1021/acs.jpcb.4c00385PMID 38754065
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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