SAMPL2 and continuum modeling.

Area of Science:

• Computational chemistry
• Physical chemistry

Background:

• The SAMPL (Statistical Analysis of Molecular Properties) challenge aims to assess the accuracy of computational methods for predicting molecular properties.
• Vacuum-water transfer energies are crucial for understanding solvation effects and molecular interactions.

Purpose of the Study:

• To present computational contributions to the SAMPL2 challenge.
• To evaluate the performance of Poisson-Boltzmann continuum theory with various charge sets and radii for predicting transfer energies.
• To identify needs for improved experimental data.

Main Methods:

• Application of Poisson-Boltzmann continuum theory to single low-energy conformations.
• Utilized diverse charge sets and atomic radii within the computational model.
• Analysis of results in the context of previous SAMPL events.

Main Results:

• The computational approach provided insights into vacuum-water transfer energies.
• Observed strong indications of discrepancies and potential errors in existing experimental measurements.
• Highlighted the sensitivity of the model to the chosen charge sets and radii.

Conclusions:

• The current computational methods, while informative, reveal inconsistencies in experimental data.
• There is a critical need for new, high-quality experimental measurements of vacuum-water transfer energies.
• Further research should focus on refining both experimental techniques and computational models for accurate solvation energy predictions.