(Ferrocenylmeth­yl)dimethyl­ammonium bromide

The title compound, [Fe(C₅H₅)(C₈H₁₃N)]Br, is isotypic with the analogous chloride compound. The Fe—C bond lengths are in the range 2.020 (6)–2.048 (7) Å. In the crystal, the cations and bromide anions are connected by N⁺—H...Br⁻ hydrogen bonds.

Methyl 5-chloro-2-(4-methyl­benzene­sulfonamido)­benzoate

In the title compound, C₁₅H₁₄ClNO₄S, the benzene rings are oriented at a dihedral angle of 85.42 (1)°. An intra­molecular N—H...O hydrogen bond results in the formation of a five-membered ring and an intramolecular C—H...O inter­action also occurs.

4-(N-Propan-2-ylcarbamo­yl)pyridinium perchlorate

In the title compound, C₉H₁₃N₂O⁺·ClO₄⁻, the dihedral angle between the planes of the amide group and the pyridinium fragment is 34.11 (14)°. In the crystal, the cations are connected by N—H...O hydrogen bonds between the amide groups into chains extended along the a axis. Hydrogen bonds between the pyridinium N—H group and the perchlorate anions organize the chains into a two-dimensional network.