Hydrated electrons in irradiated, highly concentrated magnesium chloride solutions

The nanosecond pulse radiolysis method was used to investigate the yields and kinetics of eaq- reactions in 0.5-4.8 mole/dm3 aqueous solutions of MgCl2 in the temperature range 298-393 K. It was found that under these conditions Geaq- = 2.7 ± 0.3 electrons/100 eV. At high solution concentrations eaq- disappears in a reaction with Mg(II), the energetics of which are validated by quantum-chemical calculations of the electronic structure of Mg(II) aquo-complexes. The temperature dependence of the rate constant for this reaction in solutions of differing concentrations suggests that the rise in the constant with increasing solution concentration is determined mainly by a change in the entropy factor