The title compound [H 2NNHC(NH 2) 2] 2[C 6HO 2(NO 2) 3] ( 2) 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) ？, b = 10.7473(4) ？, c = 11.9604(5) ？, α = 113.212(4)°, β = 90.579(3)°, γ = 99.815(3)°, V = 779.68(6) ？ 3, Z = 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) ？) at the carbons bearing the nitro groups, and smaller ones (113.30(17) and 114.07(17) ？) 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 NH 2 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.
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