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- W4381245610 abstract "We resolve a seeming paradox arising from a common misinterpretation of Ben-Naim's theorem, which rests on a pairwise decomposition of the Hamiltonian of a molecular solute/solvent system into pairwise solute-solvent and solvent-solvent interactions. According to this theorem, also the solvation entropy can be decomposed into a solute-solute term and a remaining term that is -- perhaps misleadingly -- referred to as solvent reorganization entropy. Crucially, the latter equals the average solvent-solvent interaction energy, such that these two solvent-solvent terms do not change the total solvation free energy. This analytical result has often been used to argue that the reorganization of the solvent cannot play a role in the solvation process, and thus to rule out iceberg-type solvent shell ordering as a solvation driving force. However, recent calculations based on atomistic simulations of a solvated globular protein and spatially resolved mutual information expansions revealed substantial contributions of many-body solvent correlations to the solvation free energy. Here we resolved this seeming contradiction and illustrate by two examples -- a simple Ising model and a solvated Lennard-Jones particle -- that the solvent reorganization entropy and the actual entropy contribution arising from many-body solvent correlations differ both conceptually and numerically. Whereas the solvent reorganization entropy in fact arises from both solvent-solvent as well as solute-solvent interactions and thus fails to describe what the name suggests, the mutual information expansion permits a straightforward interpretation in terms of the entropy contribution of solvent-solvent correlations to the solvation free energy." @default.
- W4381245610 created "2023-06-20" @default.
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- W4381245610 date "2023-06-15" @default.
- W4381245610 modified "2023-10-16" @default.
- W4381245610 title "Why solvent response contributions to solvation free energies are compatible with Ben-Naim's theorem" @default.
- W4381245610 doi "https://doi.org/10.48550/arxiv.2306.09392" @default.
- W4381245610 hasPublicationYear "2023" @default.
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