(E)-4-[2-(4-Eth­oxy­phen­yl)ethen­yl]-1-methyl­pyridinium naphthalene-2-sulfonate

In the title salt, C₁₆H₁₈NO⁺·C₁₀H₇O₃S⁻, the substituents attached to the central C=C bond adopt a trans conformation and the benzene and pyridinium rings are nearly coplanar, making a dihedral angle of 6.01 (9)°. The crystal structure features weak C—H...O hydrogen bonds and C—H...π inter­actions .

N-[4-(Di­methyl­amino)­benzyl­idene]-4-methyl­aniline

The mol­ecules of the title compound, C₁₆H₁₈N₂, exists in a trans conformation with respect to the C=N bond [1.270 (3) Å]. The least-squares plane of the di­methyl­amino group makes a dihedral angle of 1.3 (2)° with the ring to which it is attached. The dihedral angle between the two aromatic rings is 11.70 (2)°. The crystal structure features weak C—H...π inter­actions.

4-Fluoro-N-[(E)-3,4,5-tri­meth­oxy­benzyl­idene]aniline

The title compound, C₁₆H₁₆FNO₃, exists in a trans configuration with respect to the C=N bond [1.258 (2) Å]. The central meth­oxy O atom deviates from the plane of the attached benzene ring by 0.0911 (14) Å. The dihedral angle between the aromatic rings is 47.58 (11)°. The crystal structure features C—H...N and C—H...O inter­actions.