In the title compound, C(6)H(9)N(2) (+)·C(6)H(2)N(3)O(7) (-), the three nitro groups of the anion are twisted from the central benzene ring at dihedral angles of 5.4 (1), 27.1 (1) and 32.9 (1)°. In the crystal, inter-molecular N-H⋯O, N-H⋯(O,O) and N-H⋯N hydrogen bonds link the cations and anions into layers parallel to the bc plane.

In the title compound, C(6)H(7)BrN(+)·C(6)H(2)N(3)O(7) (-), the O atoms of two of the nitro groups are disordered over two sites, the ratios of the refined occupancies being 0.72 (6):0.28 (6) and 0.74 (5):0.26 (5). In the crystal structure, the anions and cations are linked via inter-molecular N-H⋯O hydrogen bonds into chains along [100]. Further stabilization is provided by weak inter-molecula...

In both ionic components of the title salt, C(4)H(7)N(2) (+)·C(6)H(2)N(3)O(7) (-), the rings are approximately planar; the maximum deviation from the mean plane is an order of magnitude larger in the picrate ring [0.0289 (10) Å] than in the imidazolium ring [0.0028 (10) Å. The nitro groups are twisted with respect to the six-atom ring plane; the NO(2) groups next to the oxide O atom, at the 2- ...

The geometric parameters of the title compound, C(4)H(6)N(3) (+)·C(6)H(2)N(3)O(7) (-), are in the usual ranges. While two nitro groups are almost coplanar with the aromatic picrate ring [dihedral angles 3.0 (2) and 4.4 (3)°], the third is significantly twisted out of this plane [dihedral angle 46.47 (8)°]. Anions and cations are connected via N-H⋯O hydrogen bonds. The mol-ecules crystallize in ...

The asymmetric unit of the title salt, C4H12NO2 (+)·C6H2N3O7 (-), contain two bis-(2-hy-droxy-eth-yl)ammonium cations and two picrate anions. An intra-molecular N-H⋯O hydrogen bond occurs in each cation. In the crystal, mol-ecules are linked via O-H⋯O and N-H⋯O hydrogen bonds, which generate two R 2 (1)(6), an R 2 (2)(10) and an R 2 (2)(13) graph-set ring motifs. There are also a number of C-H⋯...