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organic compounds
The title compound, C6H11N3O22+·SO42−, crystallizes with two cations and two anions in the asymmetric unit. In both diprotonated histidinium cations, the Cγ atom has a gauche-II conformation with respect to the amine N atom and it is in a trans position to the C atom. An extensive three-dimensional network of intermolecular N—H
O and O—HO hydrogen bonds links the histidinium cations and sulfate anions, forming a crystal structure in which zigzag (Z1) head-to-tail sequences are observed for both the cations.
O and O—HO hydrogen bonds links the histidinium cations and sulfate anions, forming a crystal structure in which zigzag (Z1) head-to-tail sequences are observed for both the cations.organic compounds
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.
organic compounds
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].
organic compounds
The title compound, 2C6H5NO2·H+·ClO4−, consists of [(nicotinic acid)2H]+ cations and ClO4− anions. Two nicotinic acid zwitterions are linked by a strong symmetric O—HO hydrogen bond, with the H atom on an inversion center and an O·O distance of 2.464 (4) Å, forming a cation. The nicotinic acid cation forms hydrogen bonds to adjacent cations, giving two-dimensional layers. The Cl atom of the perchlorate anion lies on a twofold axis.
O hydrogen bond, with the H atom on an inversion center and an O·O distance of 2.464 (4) Å, forming a cation. The nicotinic acid cation forms hydrogen bonds to adjacent cations, giving two-dimensional layers. The Cl atom of the perchlorate anion lies on a twofold axis.organic compounds
In the title complex, 2C6H6NO2+·SO42−, the carboxyl groups of the two nicotinium cations (A and B) are twisted from the pyridinium ring, with dihedral angles of 9.1 (5) and 7.0 (9)°, respectively. Packing involves classical O—HO and N—HO hydrogen bonds. Cations A are interlinked through an O atom of the sulfate anion, forming an infinite chain running along the b axis and leading to cationic layers separated by a distance of 3.106 (4) Å. Cations B form an inversion-related closed hydrogen-bonded loop.
O and N—HO hydrogen bonds. Cations A are interlinked through an O atom of the sulfate anion, forming an infinite chain running along the b axis and leading to cationic layers separated by a distance of 3.106 (4) Å. Cations B form an inversion-related closed hydrogen-bonded loop.
