organic compounds
Open access
In the title salt, C11H17N2O2S+·CF3COO−, the cation is protonated at the secondary piperazine N atom. The dihedral angle between the benzene ring and the piperazine mean plane is 85.54 (10)°. In the crystal, cations and anions are connected by two types of strong N—HO hydrogen bonds into chains extending along [101]. The chains are further assembled into (10-1) layers via stacking interactions between benzene rings of the cations [centroid–centroid distance = 3.7319 (13) Å] and a C—HO interaction involving a piperazine C—H group and a sulfonyl O atom. Another C—HO interaction between the piperazine ring and the sulfonyl group connects the ions into a three-dimensional network.
organic compounds
Open access
The title molecule, C6H7N3O, is almost planar (r.m.s. deviation = 0.0068 Å) and adopts an E conformation about the C=N double bond. In the crystal, molecules are linked by pairs of strong N—HN hydrogen bonds, forming inversion dimers with R22(10) motifs. The dimers are further linked into C(3) chains through O—HN hydrogen bonds.