organic compounds
In 3-methylanilinium picrate (3-MAP), C7H10N+·C6H2N3O7-, one of the nitro groups in the picrate ion is rotationally disordered with site occupancy factors of 0.80 and 0.20. The expected proton transfer took place between picric acid and 3-methylaniline, and the amine group is hydrogen bonded to two of the phenolate O atoms. The ortho-nitro groups deviate greatly from the benzene plane of the picrate ion, facilitating hydrogen-bond formation. While the cations are stacked as columns along the [001] direction, the anions are stacked in an offset fashion.
organic compounds
The title molecular complex, C25H25BrF3N4+·C6H2N3O7−, crystallizes with two pairs of cations and anions in the asymmetric unit. While the orientations of the two cations are nearly parallel to one another, this is not so for the anions. The imidazonaphthyridine moiety is planar and the methylpiperidine group is approximately perpendicular to it and adopts an ideal chair conformation. The planes of the bromophenyl rings deviate from the planes of the imidazonaphthyridine moieties by 30.2 (2) and 22.6 (3)° in the two cations, making a marked difference in the overall conformation of the cations. The N—HN hydrogen bond forms an intramolecular ring pattern S(7) in both cations. The anions and cations are connected through N—HO, C—HO and C—HF hydrogen bonds.
organic compounds
In the title salt, C2H8N+·C6H2N3O7−, there is complete transfer of the OH proton from picric acid to the amine. The picrate anions lie almost parallel to the monoclinic (101) plane and are connected by OO short contacts. The ethylaminium and picrate ions are linked through N—HO and C—HO hydrogen bonds along the crystallographic b axis. In the picrate anion, tilting of the para-nitro group is a consequence of C—HO hydrogen bonding between the ions.
organic compounds
In the title complex, C5H16N22+·2C6H2N3O7−, the two picrate anions lie almost parallel to each other and have possible π–π interactions between them. One of the anions is involved in limited N—HO bonds, whereas the other engages in extensive N—HO and C—HO hydrogen bonds. Tilting of one of the ortho nitro groups in the picrate anion is influenced by the N—HO hydrogen bond. The dimethylaminopropylammonium and picrate ions are linked through N—HO and C—HO hydrogen bonds, forming chains along the crystallographic b axis. The anions form near-helical columns along the b axis owing to the presence of a 21 screw and are separated by nearly linear cationic chains.
organic compounds
In the title salt, C21H23N4+·C6H2N3O7−·H2O, the dimethylammoniomethyl side chain is oriented nearly perpendicular to the imidazonaphthyridine moiety, which is nearly planar. In the crystal structure, intermolecular N—HO and O—HO hydrogen bonds link two cations, two anions and two water molecules into clusters, which further interact via weak C—HO hydrogen bonds.
organic compounds
The title salt, C6H16N+·C6H2N3O7−, crystallizes with two pairs of cations and anions in the asymmetric unit. Anions A and B are stacked alternately in the (020) plane to form anionic columns having an ABABAB… sequence, with possible π–π interactions between them. The cationic columns surround these columns in an almost hexagonal fashion, with each column of the same type of cation, A or B. The anions and cations are connected through lone N—HO and by other C—HO hydrogen bonds. N—HO and C—HO hydrogen bonds involving A-and B- type ions form a cyclic pattern with a graph-set descriptor R22(10).