Pyridoxinium picrate

Supramolecular synthesis and characterization of crystalline solids obtained from the reaction of 5-fluorocytosine with nitro compounds

In this manuscript we introduce a broad solid-state characterization of 5-fluorocytosine (5-FC) solid forms obtained with picric (PA) and 3,5-dinitrosalicylic (DNSA) nitro acids.

Two-dimensional networks in 2-methylanilinium picrate and 2,5-dichloroanilinium picrate

Both the title molecular adducts of 2-methylaniline or 2,5-dichloroaniline with picric acid are 1:1 organic salts, namely 2-methylanilinium picrate, C(7)H(10)N(+) x C(6)H(2)N(3)O(7)(-), (I), and 2,5-dichloroanilinium picrate, C(6)H(6)Cl(2)N(+) x C(6)H(2)N(3)O(7)(-), (II). In both structures, the phenoxide O atoms accept two N-H hydrogen bonds in a bifurcated acceptor fashion, which link the component ions by N-H...O hydrogen bonds into continuous two-dimensional zigzag layers, running parallel to the (100) plane in (I) and the (010) plane in (II). A pi-pi interaction is observed between symmetry-related anilinium cations in (I), while in (II), Cl...O(nitro) and Cl...Cl interactions are observed. This study indicates that a substitution on aniline can exert a pivotal influence on the construction of its supramolecular structure.

Three-dimensional network in piper-azine-1,4-diium-picrate-piperazine (1/2/1)

In the title compound, C₄H₁₂N₂²⁺·2C₆H₂N₃O₇⁻·C₄H₁₀N₂, the piperazine-1,4-diium cations and piperazine mol­ecules lie on crystallographic inversion centres. In the crystal structure, inter­molecular N—H⋯O and N—H⋯N hydrogen bonds link the components to form two-dimensional layers parallel to the (001) plane. These layers are, in turn, connected by weak inter­molecular C—H⋯O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distance between parallel aryl rings = 3.764 (2) Å, interplanar spacing = 3.500 (2) Å and ring offset = 1.387 (2) Å], forming a three-dimensional framework.