The Effect of Sulfurhexafluoride on the Photochemistry of Aqueous Solutions

The effect of SF6 as a specific scavenger for eaq− in the photolysis of aqueous solutions has been studied. The photolysis of aqueous solutions of I− with 2537 Å light and Br−, Cl−, and SCN− with 1849 Å light containing [SF6] = 1.4 × 10−3 M results in the formation of F−, the yields of which are [Formula: see text], 1.98 ± 0.05, 2.40 ± 0.08, and 2.07 ± 0.05, respectively. By comparison with [Formula: see text]from N2O saturated solutions the relationship [Formula: see text] was confirmed. Assuming the same ratio, [Formula: see text] for pure H2O and aqueous HPO42− with 1849 Å radiation and [SF6] = 2.4 × 10−4 is 0.013 ± 0.002 and 0.30 ± 0.07, but these are considered minimum values due to the low concentration of SF6. Despite these yields HPO42− could be used as buffer in 1849 Å photolysis due to its low extinction at this wavelength.