2-Amino-4-methyl-pyridinium 4-amino-benzoate

K, Phan VQ, Kim H. Synthesis, crystal growth, structural and physico-chemical properties of an Organic single crystal (C11H16N2O4) for fast scintillation and NLO applications

The 2-amino 4-methyl pyridinium glutaric acid (2A4MGA) compound was synthesized and single crystals were grown from the solution for the first time. From the single crystal X-ray diffraction (SCXRD) measurement,...

Structures of benzoic acids with substituted pyridines and quinolines: salt versus co-crystal formation

Acids and bases were crystallized so that their ΔpK_a spans the ‘uncertainty’ region for the formation of salt versus co-crystals.

2-Amino-4-methyl-pyridinium 3-chloro-benzoate

In the title salt, C₆H₉N₂⁺·C₇H₄ClO₂⁻, the 2-amino-4-methyl­pyridinium cation is almost planar, with a maximum deviation of 0.010 (1) Å. In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxyl­ate O atoms of the anion via a pair of N—H⋯O hydrogen bonds, forming an R₂²(8) ring motif. The ion pairs are further connected via N—H⋯O and C—H⋯O hydrogen bonds, forming a two-dimensional network parallel to the bc plane.

2-Amino-4-methyl-pyridinium trifluoro-acetate

The asymmetric unit of the title compound, C(6)H(9)N(2) (+)·C(2)F(3)O(2) (-), contains two independent 2-amino-4-methyl-pyridinium cations and two independent trifluoro-acetate anions. The F atoms of both anions are disordered over two sets of sites, with site occupancies of 0.50 (3) and 0.50 (3) in one of the anions, and 0.756 (9) and 0.244 (9) in the other. In the crystal, the cations and anions are linked into chains along the b axis by N-H⋯O hydrogen bonds and these chains are cross-linked by C-H⋯O hydrogen bonds, forming a two-dimensional network lying parallel to (101). The crystal structure is further stabilized by π-π inter-actions between the pyridinium rings [centroid-centroid distances = 3.5842 (13) and 3.5665 (16) Å].