The title compound [H2
) was prepared in 85% yield by treatment of sodium styphnate with 2 equivalents of aminoguanidinium nitrate, followed by crystallization from aqueous solution. Compound 2
crystallizes in the triclinic space group Pī with unit cell dimensions a
= 6.7224(3) Å, b
= 10.7473(4) Å, c
= 11.9604(5) Å, α
= 113.212(4)°, β
= 90.579(3)°, γ
= 99.815(3)°, V
= 779.68(6) Å3
= 2. In the solid state structure of 2
, no water of crystallization is present. Bond angles within the aromatic ring of the styphnate anion indicate a significant distortion with larger angles (122.04(18)–125.96(18) Å) at the carbons bearing the nitro groups, and smaller ones (113.30(17) and 114.07(17) Å) at the C-O−
carbon atoms. The crystal structure of 2
consists of layers formed by an extensive network of N-H...
O hydrogen bonds between NH2
groups of the aminoguanidinium cation and the negatively charged oxygens of the styphnate anion. The layers are again interconnected by N-H...
N hydrogen bonds between neighboring aminoguanidinium cations.