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In the title compound, C9H26N33+·3NO3, the triprotonated 1,1,4,7,7-penta­methyl­diethylenetri­amine mol­ecules are linked to the nitrate anions by multiple bifurcated N—H...(O,O) and weak C—H...O hydrogen bonds. The organic cation is characterized by N—C—C—N torsion angles of −176.2 (2) and 176.6 (2)°.

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The asymmetric unit of the title salt, C8H14N22+·2NO3, contains two independent dications and four independent nitrate anions. The crystal structure consists of discrete nitrate ions, three of which stack in layers parallel to (001) at z = 0 and 0.5. These layers are connected via m-xylylenediaminium dications. The fourth anion is sandwiched by the two independent organic cations in the asymmetric unit. In the crystal, the ions are connected by a large number of bifurcated and non-bifurcated N—H...O(O) hydrogen bonds, forming sheets parallel to (100). These sheets are connected by C—H...O hydrogen bonds, forming a three-dimensional network.

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The asymmetric unit of the title salt [systematic name: 2-(3,4-di­hydroxy­phen­yl)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 supra­molecular network.

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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.
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