Abstract
DURING a recent study1 of the photochemistry of sulphite ions in aqueous solutions, an absorption spectrum with a maximum λ-275 mµ was observed in the flash photolysis of 10−2 M Na2SO3 solutions in the presence or the absence of oxygen. This transient species, with an apparently low extinction coefficient, decays relatively slowly with a half-life of a few milliseconds. It was considered to be produced from the primary photoionization of sulphite ions 
and was tentatively assigned to the SO3− radical. A radical with a similar absorption spectrum, but longer lived, was also observed1 in the flash photolysis of thiosulphate ions and, on the basis of kinetic evidence, was assigned to the S2O2− radical. In order to provide further support for the species produced in the photolysis of SO32− ions, we examined the flash photolysis of dithionate ions, S2O62−.
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References
Dogliotti, L., and Hayon, E., J. Phys. Chem. (in the press).
Albu, H. W., and Goldfinger, P., Z. Physik. Chem., 16B, 338 (1932). Ley, H., and Arends, B., Z. Physik. Chem., 15B, 311 (1930).
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Dogliotti, L., and Hayon, E., J. Phys. Chem., 71, 2511 (1967). Langmuir, M., and Hayon, E., J. Phys. Chem., 71, 3808 (1967).
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DOGLIOTTI, L., HAYON, E. Optical Spectrum of SO3−; Radicals produced from the Photolysis of Dithionate Ions in Solution. Nature 218, 949–950 (1968). https://doi.org/10.1038/218949a0
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DOI: https://doi.org/10.1038/218949a0
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