m-Xylylenediaminium dinitrate

The twinned crystal structure of 1,3-phenylenedimethanaminium dibromide, C8H14Br2N2

C8H14Br2N2, monoclinic, I2/a (no. 15), a = 9.0331(9) Å, b = 13.4475(14) Å, c = 27.586(3) Å, β = 94.879(9)°, Z = 12, V = 3338.8(6) Å3, R gt (F) = 0.0582, wR ref = 0.0885, T = 290 K.

m-Xylylenediaminium sulfate: crystal structure and Hirshfeld surface analysis

The crystal structure of the title salt {systematic name: [1,3-phenyl-enebis(methyl-ene)]bis-(aza-nium) sulfate}, C8H14N2 (2+)·SO4 (2-), consists of infinite (100) sheets of alternating organic and inorganic entities The m-xylylenediaminium cations are linked to the sulfate anions by N-H⋯O and asymmetric bifurcated N-H⋯(O,O) hydrogen bonds, generating a three-dimensional network. A weak C-H⋯O inter-action also occurs. The Hirshfeld surface analysis and the two-dimensional fingerprint maps indicate that the packing is dominated by H⋯O/O⋯H and H⋯H contacts.

trans-2,5-Di-methyl-piperazine-1,4-diium dinitrate

In the structure of the title salt, C₆H₁₆N₂²⁺·2NO₃⁻, the cations are connected to the anions through bifurcated N—H⋯(O,O) and weak C—H⋯O hydrogen bonds, generating corrugated layers parallel to the (100) plane. The organic cation is centrosymmetric and the diprotonated piperazine ring adopts a chair conformation, with the methyl groups occupying equatorial positions.

Dopaminium nitrate

THE ASYMMETRIC UNIT OF THE TITLE SALT [SYSTEMATIC NAME: 2-(3,4-di-hydroxy-phen-yl)ethanaminium nitrate], C8H12NO2 (+)·NO3 (-), contains two independent cations and two independent nitrate anions. The crystal structure consists of discrete nitrate ions stacked in layers parallel to (010). These layers are linked via the dopaminium cations by O-H⋯O, N-H⋯O and weak C-H⋯O hydrogen bonds, forming a three-dimensional supra-molecular network.