Solvation Free Energies for Aqueous and Nonaqueous Solutions Computed Using PM7 Atomic Charges.
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ABSTRACT: We describe a simple and accurate method, ESE-PM7, for calculating solvation free energies ΔGsolv° in aqueous and nonaqueous solutions. The method is based on a noniterative COSMO algorithm. Molecular geometries and atomic charges calculated using the semiempirical method PM7 are used to calculate ΔGsolv°. The method has been tested on 92 different solvents and 988 solutes. The mean absolute errors (MAEs) in ΔGsolv° in aqueous solutions estimated by the ESE-PM7 approach are found to be 1.62 kcal/mol for 389 neutral solutes and 3.06 kcal/mol for 139 ions. The MAEs for neutral molecules in organic solvents are 0.97, 0.74, and 0.51 kcal/mol in polar protic, polar aprotic, and nonpolar solvents, respectively. The developed method can be employed to quickly screen ΔGsolv° values of extended molecular systems including pharmaceutical and biological molecules.
SUBMITTER: Vyboishchikov SF
PROVIDER: S-EPMC8479861 | biostudies-literature |
REPOSITORIES: biostudies-literature
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