The Hydration Number of Li+ in Liquid Water

Details The Hydration Number of Li+ in Liquid Water The Hydration Number of Li+ in Liquid Water

2000-01-05

arxiv.org/abs/physics/0001011v1

J. Am. Chem. Soc. 122, 966-967 (2000)

Physics

Chemical Physics

9 pages, 2 figures

Scientific paper

A theoretical treatment based upon the quasi-chemical theory of solutions predicts the most probable number of water neighbors in the inner shell of a Li+ ion in liquid water to be four. The instability of a six water molecule inner sphere complex relative to four-coordinated structures is confirmed by an `ab initio' molecular dynamics calculation. A classical Monte Carlo simulation equilibrated 26 water molecules with a rigid six-coordinated Li(H2O)6+ complex with periodic boundary conditions in aqueous solution. With that initial configuration for the molecular dynamics, the six-coordinated structure relaxed into four-coordinated arrangements within 112 fs and stabilized. This conclusion differs from prior interpretations of neutron and X-ray scattering results on aqueous solutions.

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