Not formula A widely reported in textbooks, but the SH form B probably represents the correct structure of thiosulfuric acid. This was established by Hartree-Fock/ab initio calculations with a 6–311 G** basis set and MP2 to MP4 refinements. The same is true for the monoanion. In the more stable HSSO isomer an unusually long SS bond is observed, which is probably significant in the decomposition of thiosulfuric acid in water.
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Mia̧skiewicz et al. (1992) studied this question.
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