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Evaluating the COSMO-RS method for modeling hydrogen bonding in solution.

Sofja Tshepelevitsh¹, Merit Oss, Astrid Pung

¹Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|May 1, 2013

Summary

This summary is machine-generated.

The Conductor-like Screening Model for Realistic Solvation (COSMO-RS) accurately predicts hydrogen bond formation for neutral molecules but struggles with anion interactions in solution. This study validates its performance across various solvent systems.

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Area of Science:

Computational chemistry
Physical chemistry
Solution chemistry

Background:

Hydrogen bonding (HB) is crucial in chemical and biological systems.
Accurate modeling of HB in solution is essential for predicting molecular interactions.
The Conductor-like Screening Model for Realistic Solvation (COSMO-RS) is a computational method for solvation studies.

Purpose of the Study:

To evaluate the accuracy of the COSMO-RS method in modeling hydrogen bond formation in various solution environments.
To compare COSMO-RS predictions with experimental data for different types of hydrogen bonding interactions.
To assess the performance of COSMO-RS in mixed solvent systems, a novel aspect of this research.

Main Methods:

Utilized the Conductor-like Screening Model for Realistic Solvation (COSMO-RS) computational method.
Employed both the supermolecule (SM) and contact probability (CP) approaches for HB analysis.
Compared calculated equilibrium constants, Gibbs' free energies, and enthalpies with literature experimental data.

Main Results:

COSMO-RS demonstrated good to very good correlation with experimental data for HB formation between neutral species.
Quantitative predictions were enabled for complexes involving neutral molecules.
Correlations were poor for systems where an anion acted as the hydrogen bond acceptor, with failures in qualitative predictions.

Conclusions:

COSMO-RS is a reliable tool for quantitatively predicting hydrogen bond formation involving neutral molecules in solution.
The method's accuracy is significantly limited when modeling hydrogen bonds with anions as acceptors.
Further development of computational methods is needed to accurately describe anion-involved hydrogen bonding interactions in solution.