organic compounds
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The asymmetric unit of the title hydrated salt, C6H14NO2+·F−·H2O, contains a discrete cation with a protonated amino group, a halide anion and one water molecule. The crystal structure is composed of double layers parallel to (010) held together by N—HO, N—HF, O—HF and C—HF hydrogen bonds, forming a two-dimensional network, and stacked along the c axis, viz. hydrophilic layers at z = 0 and 1/2 and hydrophobic layers at z = 1/3 and 2/3.
organic compounds
Open access
In the title compound, C9H12NO3+·Cl−·2H2O, the cation has a protonated amino group resulting from proton transfer from chloridric acid. The structure displays double layers parallel to the [010] direction held together by N—HO, N—HCl, O—HO and O—HCl hydrogen bonds. These layers are stacked along the c axis at b = 1/2; within each layer, the tyrosinium cations are arranged in an alternating head-to-tail sequence, forming inversion dimers [R22(10) motif]. The water molecules allow for the construction of a three-dimensional hydrogen-bonded network formed by centrosymmetric R66(28) and R88(34) motifs.
organic compounds
Open access
The title compound, 2C5H7N52+·2HSO4−·SO42−, was synthesized from adenine and sulfuric acid. The asymmetric unit contains two diprotonated adeninium cations, two bisulfate anions and one sulfate anion. The crystal structure is stabilized by classical N—HO and O—HO hydrogen bonds, and weak C—HO and C—HN hydrogen bonds, generating a three-dimensional network.