Nicotinium dihydrogenphosphate

In the title complex, C₆H₆NO₂⁺·H₂PO₄^-, the nicotinium cations are sandwiched between layers of dihydrogen­phosphate anions. The structure is held together by extensive hydrogen bonding between the O and N atoms of nicotinium cations and the O atoms of the phosphate anions, and between the O atoms of the phosphate anions themselves. The nicotinium cations are packed in layers, with an inter­layer distance of 3.116 (5) Å.

Nicotinium picrate

The title compound, C₆H₆NO₂⁺·C₆H₂N₃O₇^-, is the picrate salt of the nicotinium cation. In the picrate anion, the ortho nitro groups are twisted out of the plane of the ring, whereas the para nitro group lies approximately in the ring plane. Hydrogen bonds from the nicotinate cation link two different picrate anions, forming a straight chain along the b axis. The picrate anions are stacked in columns along [010].