Bis{4-[(E)-2-(1H-indol-3-yl)ethen­yl]-1-methyl­pyridinium} 4-chloro­benzene­sulfonate nitrate

In the title mixed salt, 2C₁₆H₁₅N₂⁺·C₆H₄ClO₃S⁻·NO₃⁻, one of the cations shows whole mol­ecule disorder over two sets of sites in a 0.711 (7):0.289 (7) ratio. The 4-chorobenzenesulfon­ate anion is also disordered over two orientations in a 0.503 (6):0.497 (6) ratio. The cations are close to planar, the dihedral angles between the pyridinium and indole rings being 1.48 (3)° in the ordered cation, and 5.62 (3) and 2.45 (3)°, respectively, for the major and minor components of the disordered cation. In the crystal, the cations are stacked in an anti­parallel manner approximately along the a-axis direction and linked with the anions via N—H...O hydrogen bonds and C—H...O inter­actions, generating a three-dimensional network. Weak C—H...π and π–π inter­actions [with centroid–centroid distances of 3.561 (2)–3.969 (7) Å] are also observed.

2-[(E)-2-(4-Hy­droxy-3-meth­oxy­phen­yl)ethen­yl]-1-methylpyridinium 4-bromo­benzene­sulfonate monohydrate

The title salt crystallized as the monohydrate C₁₅H₁₆NO₂⁺·C₆H₄BrSO₃⁻·H₂O. The cation exists in an E conformation with respect to the ethynyl bond and is essentially planar, with a dihedral angle of 6.52 (14)° between the pyridinium and the benzene rings. The hy­droxy and meth­oxy substituents are coplanar with the benzene ring to which they are attached, with an r.m.s. deviation of 0.0116 (3) Å for the nine non-H atoms [C_meth­yl—O—C—C torsion angle = −0.8 (4)°]. In the crystal, the cations and anions are stacked by π–π inter­actions, with centroid–centroid distances of 3.7818 (19) and 3.9004 (17) Å. The cations, anions and water mol­ecules are linked by O—H...O hydrogen bonds and weak C—H...O inter­actions, forming a three-dimensional network.