4-(Dimethyl­amino)­pyridinium tetra­chloridoferrate(III)

The title salt, (C₇H₁₁N₂)[FeCl₄], consists of one essentially planar (the r.m.s. deviation for all non-H atoms being 0.004 Å) 4-(dimethyl­amino)­pyridinium cation and a tetra­hedral tetra­chloridoferrate(III) anion. The cations and anions are arranged in layers parallel to (010). Besides electrostatic inter­actions, the crystal packing features N—H...Cl and C—H...Cl hydrogen bonds between cations and anions, forming a three-dimensional network.

2-[(2-Aza­niumyleth­yl)carbamo­yl]phenolate–phenol (1/1)

In the title 1:1 adduct, C₉H₁₂N₂O₂·C₆H₆O, the dihedral angle between the benzene ring and the salicylic amide group is 6.68 (6)°. The conformation of the amide group is supported by two intra­molecular N—H...O hydrogen bonds, which close S(6) and S(7) rings. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, generating (100) sheets.