In the title compound, C15H13BrN2O3·H2O, the dihedral angle between the two benzene rings is 13.92 (6)°. The methoxy group of the 4-hydroxy-3-methoxyphenyl is almost coplanar with its bound benzene ring, as seen by the Cmethyl—O—C—C torsion angle of −0.35 (16)°. In the crystal, molecules are linked into a three-dimensional network by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds and also weak C—H⋯O interactions. A short C⋯O contact of 3.0191 (15) Å is also present.
There are two crystallograpically independent molecules in the asymmetric unit of the title heteroaryl chalcone derivative, C16H16O4S, with slightly different conformations. The thienyl ring of one molecule is disordered over two positions, with a refined site-occupancy ratio of 0.713 (5):0.287 (5). The molecules are twisted: the dihedral angle between the thienyl and benzene rings is 9.72 (19)° in the ordered molecule, and 3.8 (4) and 2.1 (8)° for the major and minor components, respectively, in the disordered molecule. In both molecules, all three substituted methoxy groups are coplanar with the benzene ring to which they are attached. In each molecule, a weak intramolecular C—H⋯O interaction generates an S(6) ring motif. In the crystal structure, adjacent molecules are linked into a three-dimensional network by weak C—H⋯O interactions.
In the cation of the title compound, C18H23N2
+·C7H7O4S−·H2O, one ethyl group of the diethylamino unit is disordered over two sets of sites in a 0.665 (6):0.335 (6) ratio. The styrylpyridinium unit is nearly planar, with a dihedral angle between the pyridinium and benzene rings of 4.27 (8)°. In the crystal, the anion ring is almost perpendicular to the aromatic rings of the cation; the sulfonate-substituted benzene ring forms dihedral angles of 89.60 (8) and 89.37 (8)°, respectively, with the pyridinium and benzene rings of the cation. In the crystal, the three components are linked into a three-dimensional network by O—H⋯O and C—H⋯O hydrogen bonds. π–π interactions with centroid–centroid distances of 3.6999 (9) and 3.7106 (9) Å are also present.
The asymmetric unit of the title compound, C17H20NO3
+·C6H5O3S−·H2O, comprises two 1-methyl-2-[(E)-2,4,5-trimethoxystyryl]pyridinium cations, two benzenesulfonate anions and two water molecules. The cations exist in the E conformation with respect to the C=C bond; one cation is essentially planar while the other is slightly twisted, the dihedral angles between the pyridinium and phenyl rings being 1.23 (14) and 6.64 (13)°, respectively. In the crystal, cations, anions and water molecules are linked by O—H⋯O hydrogen bonds and weak C—H⋯O interactions into chains along the b axis. π–π interactions with centroid–centroid distances in the range 3.5557 (16)–3.6876 (16) Å are observed. C—H⋯π interactions and a C⋯O short contact [2.94 (4) Å] are also observed.
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