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

Abstract The reaction of hydrazine hydrate, N 2 H 4 ⋅ H 2 O, and SO 3 leads to hydrazine sulfonic acid ( Pca 2 1 , 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 NH 3 NH(SO 3 ). With the barium salt Ba[NH 2 NH(SO 3 )] 2 (H 2 O), a first salt of hydrazine sulfonic acid has been prepared ( P , 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.