Quantifying Solvophobic Effects in Nonpolar Cohesive Interactions.

Area of Science:

• Physical Chemistry
• Biochemistry
• Materials Science

Background:

• The hydrophobic effect is critical for biomolecular structure and function.
• The broader solvophobic effect lacks a universal descriptor, hindering its study in diverse solvents.
• Understanding solvent interactions is key to predicting molecular behavior.

Purpose of the Study:

• To identify a reliable descriptor for the solvophobic effect across various chemical contexts.
• To quantify solvent effects on nonpolar interactions, including aromatic, aliphatic, and fluorous types.
• To establish a new standard for measuring solvophobic association.

Main Methods:

• Utilized synthetic molecular balances to measure solvent effects.
• Performed solvent screening across a range of nonpolar interaction types.
• Integrated data from supramolecular association, single-molecule folding, and phase transfer energies.

Main Results:

• Cohesive energy density (ced) strongly correlated with measured solvent effects.
• Other cohesion measures like surface tension and internal pressure showed weaker correlations.
• Ced proved effective across aromatic, aliphatic, and fluorous chemical systems.

Conclusions:

• Cohesive energy density (ced) is established as a robust, quantitative descriptor for solvophobic effects.
• Ced offers a more accurate and accessible measure of solvent interactions than traditional metrics.
• This finding advances the understanding and prediction of molecular behavior in solution.