Structure
Some evidence may suggest that the proton in bisulfite ion is located on sulfur, giving rise to C3v symmetry. There is, however, some evidence from 17O NMR spectroscopy to suggest that two tautomeric forms of HSO3− exist in dynamic equilibrium, one having C3v symmetry (protonated at sulfur) and other Cs symmetry (protonated at oxygen). The C3v structure is supported by X-ray crystallography and, in aqueous solution, by Raman spectroscopy (ν(S–H) = 2500 cm−1).
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