The first dissociation constant of 1,2,3-benzothiadiazole is pKa= 2·84 ± 0·04 at 25°. The protonation site is the 3-position but the presence of a smaller amount of the 2-protonated species cannot be ruled out. The di-cation is absent. A violet-blue coloration, previously attributed to 1,2,3-benzothiadiazolium salts, is due to thianthren impurity.
W. H. Poesche, J. Chem. Soc. B, 1966, 469 DOI: 10.1039/J29660000469
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