An Approach to Computing Solvent Reorganization Energy.

Area of Science:

• Computational Chemistry
• Physical Chemistry
• Molecular Dynamics

Background:

• Calculating reorganization free energy is crucial for understanding solvation.
• Existing methods may lack accuracy or rely on empirical parameters.

Purpose of the Study:

• To present a novel method for accurate calculation of reorganization free energy in explicit solvent systems.
• To enable computation of both enthalpy and entropy components of solvent reorganization energy.

Main Methods:

• The interaction entropy-solvent reorganization (IESR) method combines interaction entropy and solvent reorganization enthalpy calculations.
• Utilizes molecular dynamics (MD) simulations of the solvated system.
• Relies on known solvation free energy from experiments or accurate calculations.

Main Results:

• The IESR method computes enthalpy and entropy of solvent reorganization without empirical parameters.
• Applied to water solvation of hydrophilic and hydrophobic solutes.
• Demonstrated excellent agreement between theoretical and experimental solvation energy components.

Conclusions:

• The IESR method provides an accurate and parameter-free approach for calculating solvent reorganization energy.
• Validates the theoretical framework through comparison with experimental solvation data.