The Effect of Complex Anions on the Structure of Water

摘要

The microscopic ionic volumes, v (A), of complex inorganic anions, obtained from crystal unit cell volumes, as well as their standard molar volumes, , in aqueous solutions serve to establish whether these anions are water-structure-breakers or -makers. This is done via correlations with well known criteria for such effects, namely the ionic viscosity B-coefficients and the structural entropies. Complex anions with charges z (A) are structure-breakers if v (A) > 0.1|z (A)| nm(3)center dot ion(-1) or > 35|z (A)|(4/3) cm(3)center dot mol(-1) and structure-makers if otherwise.