Anilinium-3-carboxyl­ate 3-carb­oxy­anilinium nitrate

The title compound, C₇H₈NO₂⁺·NO₃⁻·C₇H₇NO₂, exists in the form of a protonated dimer of two anilinium-3-carboxyl­ate mol­ecules related by an inversion center, and a nitrate anion located on a twofold rotation axis. The bridging H atom occupies, with equal probability, the two sites associated with the carboxyl atoms. In addition to the strong O—H...O hydrogen bond, in the crystal, the various units are linked via N—H...O and C—H...O hydrogen bonds forming a three-dimensional structure.

6-Bromo-1-methyl-4-[2-(1-phenyl­ethyl­idene)hydrazinyl­idene]-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₇H₁₆BrN₃O₂S, the dihedral angle between the aromatic rings is 1.24 (15)° and the C=N—N=C torsion angle is 167.7 (3)°. The conformation of the thia­zine ring is an envelope, with the S atom displaced by 0.805 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.027 Å). In the crystal, C—H...O inter­actions link the mol­ecules into C(10) [010] chains. A weak C—H...π inter­action is also observed.

3-Chloro-1-methyl-4-[2-(3-phenyl­allyl­idene)hydrazinyl­idene]-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₈H₁₆ClN₃O₂S, the dihedral angle between the aromatic rings is 4.81 (2)° and the alkyl chain takes on an extended conformation [N—C—C—C = 179.2 (4)°]. The conformation of the thia­zine ring is an envelope, with the S atom displaced by −0.805 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.046 Å). The Cl atom is an axial conformation and is displaced by 1.761 (4) Å from the thia­zine ring plane. In the crystal, inversion dimers linked by pairs of C—H...O inter­actions generate R₂²(20) loops and further C—H...O hydrogen bonds link the dimers into (001) sheets. Weak aromatic π–π stacking inter­actions [centroid–centroid separations = 3.870 (3) and 3.883 (3) Å] are also observed.

2-(Naphthalene-2-sulfonamido)-3-phenyl­propanoic acid

In the title compound, C₁₉H₁₇NO₄S, the phenyl ring and the naphthalene ring system are oriented at a dihedral angle of 4.12 (2)° and the mol­ecule adopts a U-shaped conformation. The C_c—C—N—S (c = carb­oxy) torsion angle is 90.98 (15)°. In the crystal, mol­ecules are linked by O—H...O and N—H...O hydrogen bonds, resulting in (100) chains incorporating centrosymmetric R²₂(14) and R²₂(10) loops. Weak aromatic π–π stacking is also observed [centroid–centroid separations = 3.963 (2) and 3.932 (2) Å].

3-Chloro-4-[2-(4-chloro­benzyl­idene)hydrazinyl­idene]-1-methyl-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₆H₁₃Cl₂N₃O₂S, the dihedral angle between the aromatic rings is 6.62 (2)° and the C=N—N=C torsion angle is 176.2 (4)°. The thia­zine ring shows an envelope conformation, with the S atom displaced by 0.633 (6) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.037 Å). The Cl atom is an an axial conformation and is displaced by 2.015 (6) Å from the thia­zine ring plane. In the crystal, mol­ecules are linked by C—H...O inter­actions, generating a three-dimensional network. Very weak aromatic π–π stacking inter­actions [centroid–centroid separations = 3.928 (2) Å] are also observed.

N,N,N′,N′-Tetra­methyl­ethylene­diammonium tetra­chlorido­zincate

The asymmetric unit of the title compound, (C₆H₁₈N₂)[ZnCl₄], consists of one tetra­chlorido­zincate anion and two half-N,N,N′N′-tetra­methyl­ethylenedi­ammonium cations. Each of the two di­ammonium cations is located about an inversion center and one of them is disordered over two sets of sites in a 0.780 (17):0.220 (17) ratio. The Zn^II atom has a slightly distorted tetra­hedral coordination environment. The cations and anions are connected via N—H...Cl hydrogen bonds into chains extending along [0-11].

2-Chloro-6-(2,3-di­chloro­benzene­sulfonamido)­benzoic acid

In the title compound, C₁₃H₈Cl₃NO₄S, the aromatic rings are oriented at a dihedral angle of 68.94 (1)° and the mol­ecule adopts a V-shape. An intra­molecular N—H...O inter­action generates a six-membered S(6) ring motif. In the crystal, pairs of O—H...O hydrogen bonds involving the carb­oxy group link the mol­ecules into inversion dimers with an R₂²(8) motif. N—H...O and non-classical C—H...O inter­actions connect the mol­ecules, forming sheets propagating in (100).