The structure of aqueous sodium hydroxide solutions: A combined solution x-ray diffraction and simulation study

A multistate empirical valence bond model for solvation and transport simulations of OH- in aqueous solutions

We describe a new multistate empirical valence bond (MS-EVB) model of OH(-) in aqueous solutions. This model is based on the recently proposed "charged ring" parameterization for the intermolecular interaction of hydroxyl ion with water [Ufimtsev, et al., Chem. Phys. Lett., 2007, 442, 128] and is suitable for classical molecular simulations of OH(-) solvation and transport. The model reproduces the hydration structure of OH(-)(aq) in good agreement with experimental data and the results of ab initio molecular dynamics simulations. It also accurately captures the major structural, energetic, and dynamic aspects of the proton transfer processes involving OH(-) (aq). The model predicts an approximately two-fold increase of the OH(-) mobility due to proton exchange reactions.

Solution structure of NaNO3 in water: diffraction and molecular dynamics simulation study

The structure of a series of aqueous sodium nitrate solutions (1.9-7.6 M) was studied using a combination of experimental and theoretical methods. The results obtained from diffraction (X-ray, neutron) and molecular dynamics simulation have been compared and the capabilities and limitations of the methods in describing solution structure are discussed. For the solutions studied, diffraction methods were found to perform very well in description of hydration spheres of the sodium ion but do not yield detailed structural information on the anion's hydration structure. Molecular dynamics simulations proved to be a suitable tool in the detailed interpretation of the hydration sphere of ions, ion pair formation, and bulk structure of solutions.

Hydroxide trapped in the interior of ice: a computational study

A new configuration is proposed for trapping of the hydroxide impurity in ice and in this "off-the-lattice" configuration, OH(-) accepts four hydrogen bonds, and, since its H atom is pointing towards a cavity in the structure, it does not donate any hydrogen bond and this configuration is proposed to account for relatively low proton activity in hydroxide-rich ice systems, as observed in isotopic exchange experiments.