Hydrazine Sulfonic Acid, NH3NH(SO3), the Bigger Sibling of Sulfamic Acid

Abstract

The reaction of hydrazine hydrate, N2H4 ⋅ H2O, and SO3 leads to hydrazine sulfonic acid (Pca21, a=849.59(4) pm, b=482.18(2) pm, c=832.17(4) pm). Structure elucidation reveals the zwitter-anionic nature of the compound according to NH3NH(SO3). With the barium salt Ba[NH2NH(SO3)]2(H2O), a first salt of hydrazine sulfonic acid has been prepared (P (Formula presented.), a=489.75(5) pm, b=737.52(7) pm, c=1317.4(1) pm, α=88.238(4)°, β=84.761(4)°, γ=79.701(4)°). The compounds were characterized by vibrational spectroscopy, DFT calculations and thermal analyses.