Classical Models of Hydroxide for Proton Hopping Simulations.

ABSTRACT: Hydronium (H₃O⁺) and hydroxide (OH^-) ions perform structural diffusion in water via sequential proton transfers ("Grotthuss hopping"). This phenomenon can be accounted for by interspersing stochastic proton transfer events in classical molecular dynamics simulations. The implementation of OH^--mediated proton hopping is particularly challenging because classical force fields are known to produce overcoordinated solvation structures around the OH^- ion. Here, we first explore the ability of two-particle point-charge models to reproduce both the solvation free energy and coordination number in TIP3P water. We find that this is possible only with unphysical changes in the nonbonded parameters which create problems in proton hopping simulati

SUBMITTER: Dutta A 

PROVIDER: S-EPMC11647885 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature