A second crystal polymorph of anilinium picrate

Abstract

Key indicatorsSingle-crystal X-ray study T = 298 K Mean '(C±C) = 0.005 A Ê R factor = 0.053 wR factor = 0.209 Data-to-parameter ratio = 14.3For details of how these key indicators were automatically derived from the article, see

Crystal Structure of 2-Cholroanilinium Picrate

“…1 The 2-chloroanilinium molecule shows normal bond lengths and angles. The cation and anion lie almost parallel to the crystallographic ab plane, and are inclined to one another with an angle of 23.6˚ (the same for anilinium picrate polymorphs are 32.2˚ and 37.7˚).…”

“…The crystal structures of a large number of picrate salts and picric acid complexes, including those of biological base molecules, have been studied in the past. [1][2][3] The π-π interaction has been observed in many picrate salts of aromatic compounds, and it sometimes leads to a columnar stacking of the cations and anions in specific ways: fully cationic, anionic or mixed stacking. Our studies aimed to look at the nature of proton transfer, the direction of the specific N-H·O hydrogen bond between amine and phenolic groups and also the type of stacking in the solid state.…”

Crystal growth, structure and characterization of p-Toluidinium picrate

“…Interestingly, the complexation of p-nitroaniline with PA yields the adduct 2(C 6 H 3 N 3 O 7 ).C 6 N 6 N 2 O 2 and the proton was not transferred from PA to p-nitroaniline. The N-HyO hydrogen bonds are formed between amino nitrogen of p-nitroaniline and nitro oxygen atom of PA [14]. This clearly indicates that the complexation depends on the nature of the donor-acceptor system.…”

“…Picric acid, as an electron acceptor form charge transfer molecular complexes with a number of electron donor compounds such as amines [4,[8][9][10][11][12][13][14][15][16] through electrostatic or hydrogen bonding interactions. Hence, the picrates are convenient for identification and quantitative analysis of organic compounds.…”

Cocrystallization of Diphenylamine and Picric acid (1:2)

“…The title compound, diphenylamine-picric acid (1:2) (C12H11N·2C6H3N3O7), crystallizes in the monoclinic space group P21/a with the following unit-cell parameters: a = 25.4238(14), b = 6.9922 (5), c = 15.1311(8)Å, b = 92.335(5)˚, Z = 4. The crystal structure was solved by direct methods, and refined by full-matrix least-squares procedures to a final R-value of 0.0770 for 2426 observed reflections.…”