A structural investigation of a 1.1 molal BeCl 2 aqueous solution has been performed by a molecular dynamics simulation together with X-ray diffraction studies of 1.1 and 5.3 molal BeCl 2 aqueous solutions at pH =1. A central force model in combination with an improved intramolecular three-body potential was used for water. The ion-water and ion-ion potentials were derived from ab initio calculations. The structure function obtained from the simulation is in satisfactory agreement with that from X-ray diffraction. The MD simulation of the 1.1 molal solution shows that the hydration shell o f Be 2+ consists of six water molecules occupying octahedral sites around a central Be 2+ . The X-ray scattering data of the 5.3 molal solution indicate that Be 2+ has only four water molecules in the first hydration shell. The average coordination number of Cl - is found to be about seven in the 1.1 molal solution from both X-ray diffraction and MD simulation, but Cl - is surrounded on the average by 3.4 water molecules in the 5.3 molal solution. The influence of the small divalent Be 2+ on the geometry of its nearest neighbour water molecules is compared with the results of previous simulations of 1.1 molal MgCl 2 and CaCl 2 solutions.
No takes yet. Share an insight, caveat, or question.
Yamaguchi et al. (1986) studied this question.