Characteristics of selenate in aqueous solution – An ab initio QMCF-MD study

An ab initio quantum mechanical charge field molecular dynamics (QMCF-MD) study of the selenate ion in water was performed at the Hartree Fock/6-31G (d,p) level of theory. The intramolecular geometry, structure and dynamics of the hydration shell and the vibrational frequency modes calculated via velocity autocorrelation functions are presented. The resulting bond distances as well as angles and vibrational frequencies are in good agreement with experimental data. The structure and dynamics reveal the hydrogen bonding network between the ion and neighboring water molecules and exchange processes in the hydration sphere characterize the ion as a structure-forming anion.