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The asymmetric unit of the title compound, C16H16N4O2S, contains two molecules (A and B) with similar conformations: the benzene rings are oriented at dihedral angles of 80.94 (10)° and 84.54 (10)° with their adjacent 1H-benzimidazole groups. In the crystal, the molecules are connected by N—H...N hydrogen bonds, forming separate C(4) chains of both the A and B molecules along [010]. The A and B chains are cross-linked by several C—H...O interactions involving the benzene rings and the sulfonyl groups, which lead to R21(5) loops in the linkage of the chains.

In the title molecule, C16H14N2O4S, the thiazine ring adopts a twist chair conformation with the N and adjacent C atom displaced by 0.966 (3) and 0.386 (4) Å, respectively, on the same side of the mean plane formed by the remaining ring atoms. The dihedral angle between the mean planes of the benzene rings is 37.65 (10)°. The molecular structure features an intramolecular O—H...O hydrogen bond, which generates an S(6) ring. In the crystal, molecules are linked by N—H...O and C—H...O hydrogen bonds.

In the title molecule, C17H16N2O4S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.546 (4) and 0.281 (4) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The molecular structure is stabilized by an intramolecular O—H...O hydrogen bond. The two aromatic rings are inclined to one another by 42.32 (11)°. In the crystal, molecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers. The dimers are linked via a series of C—H...O interactions, leading to the formation of a three-dimensional network.

The title compound, C6H4Br2ClN, is almost planar (r.m.s. deviation = 0.024 Å) and two intramolecular N—H...Br hydrogen bonds generate S(5) rings. In the crystal, N—H...Br hydrogen bonds link the molecules into chains propagating in [010].

The asymmetric unit of the title compound, C15H10BrNO4S, contains two different conformers in which the benzisothiazole rings are essentially planar, with r.m.s. deviations of 0.012 and 0.017 Å. The mean planes of the benzene rings form dihedral angles 70.49 (13) and 72.79 (11)° with the benzisothiazole rings. The orientation of the Br atoms in the two conformers exhibit the most pronounced difference, with opposing orientations in the two molecules. The crystal structure is stabilized by π–π interactions between the benzene rings of the benzisothiazole moieties of one molecule and bromobenzene rings of the other molecule, with distances between the ring centroids of 3.599 (3) and 3.620 (3) Å, respectively. The crystal packing is further consolidated by pairs of weak intermolecular C—H...O hydrogen bonds, which form inversion dimers.

In the title compound, C8H7NO3S, the benzene ring is oriented at a dihedral angle of 69.25 (7)° to the S and O atoms of the sulfonyl group. The heterocyclic ring approximates to an envelope, with the N atom in the flap position. In the crystal, molecules are linked by N—H...Oc (c = carbonyl) hydrogen bonds, forming C(5) chains along [001]. Two R22(10) loops arise from pairs of C—H...O hydrogen bonds and a weak aromatic π–π stacking interaction [centroid–centorid separation = 3.8404 (11) Å] also occurs.

In the title molecule, C15H10ClNO4S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.527 (7) and 0.216 (7) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The molecular structure is consolidated by an intramolecular O—H...O interaction and the crystal packing is stabilized by N—H...O and C—H...O hydrogen bonds.

In the title molecule, C24H19NO6S, the heterocyclic thiazine ring adopts a half-chair conformation with the S and N atoms displaced by 0.180 (5) and 0.497 (5) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The benzene rings of the benzothiazine unit and the methoxyphenyl group are almost coplanar, with the dihedral angle between the mean planes of these rings being 5.9 (2)°, while the benzene ring of the 2-oxo-2-phenylethyl group is inclined at 79.68 (11) and 81.01 (10)°, respectively, to these rings. The molecular structure is consolidated by intramolecular O—H...O and C—H...N interactions, and the crystal packing is stabilized by weak C—H...O hydrogen bonds.

In the title molecule, C15H10BrNO4S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.554 (7) and 0.198 (8) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The molecular structure is consolidated by intramolecular O—H...O interactions and the crystal packing features N—H...O and C—H...O hydrogen bonds.

In the title molecule, C24H18ClNO6S, the heterocyclic thiazine ring adopts a half chair conformation with the S and N atoms displaced by 0.318 (3) and 0.387 (3) Å, respectively, on the opposite sides from the mean plane formed by the remaining ring atoms. The benzene rings of the benzothiazin unit and methoxybenzoyl group are more or less coplanar, the dihedral angle between the mean planes of these rings being 12.37 (10)° while the chlorophenyl ring is inclined at 81.87 (4) and 73.30 (5)°, respectively, to these rings. The molecular structure is consolidated by intramolecular O—H...O and C—H...N interactions and the crystal packing is stabilized by weak intermolecular C—H...O hydrogen bonds.

In the title compound, C10H9NO5S·0.5H2O, two geometrically different organic molecules are present. The benzene rings and the carboxylate groups are oriented at dihedral angles of 13.44 (4) and 21.15 (18)°. In both molecules, an intramolecular O—H...O hydrogen bond generates an S(6) ring. In the crystal, both moleucles form inversion dimers linked by pairs of O—H...O hydrogen bonds to generate R22(8) loops. The dimers are consolidated into chains extending along [100] by bridging O—H...O hydrogen bonds from the water molecule. A weak C—H...O hydrogen bond also occurs.

In the title compound, C15H15N5O4S2, the dihedral angles between the central 1,2,4-triazole ring and the pendant benzene rings are 55.61 (10) and 68.59 (10)°; the dihedral angle between the benzene rings is 63.66 (9)°. Intramolecular N—H...N and N—H...O hydrogen bonds generate S(7) and S(12) rings, respectively. In the crystal, sheets extending in the (101) plane arise, with the molecules linked by C—H...O, N—H...N and N—H...O interactions. A C—H...π interaction further consolidates the structure.

The asymmetric unit of the title compound, C13H18N2O3S, contains two molecules with similar conformations. In both molecules, the cyclohexyl rings adopt chair conformations, with the attached N atom in an equatorial orientation and an intramolecular N—H...O hydrogen bond generates an S(7) ring. In the crystal, N—H...O hydrogen bonds link the molecules and a C—H...O hydrogen bond is also observed. The crystal studied was a racemic twin.

In the crystal of the title compound, C14H9Cl2NO2, inversion-related dimers with R22(8) ring motifs are formed by intermolecular O—H...O hydrogen bonding. The 3-aminobenzoic acid group and the 2,4-dichlobenzaldehyde moiety subtend a dihedral angle of 55.10 (2)°. The H atom of the carboxyl group is disordered over two sites with equal occupancies.

In the molecule of the title compound, C13H8Cl3N, the 4-chloroaniline and 2,4-dichlorobenzaldehyde moieties are planar with r.m.s. deviation of 0.0115 and 0.0116 Å, respectively, and are oriented at a dihedral angle of 13.94 (8)°.

In the title compound, C14H10Cl2N2O2, the dihedral angle between the two aromatic rings is 17.39 (4)°. An intramolecular O—H...O hydrogen bond forms a six-membered R(6)11 ring motif. In the crystal structure, intermolecular N—H...O and O—H...O hydrogen-bonding interactions occur.

In the title compound, C13H9ClN2O2S, the dihedral angle between the aromatic ring systems is 6.00 (12)° and an intramolecular C—H...N interaction generates an S(6) ring. In the crystal, molecules interact by way of C—H...O and N—H...O bonds, generating R21(7) and R22(10) ring motifs, and aromatic π–π stacking interactions [centroid–centroid separations = 3.730 (3) and 3.733 (2) Å] help to consolidate the packing.

In the title molecule [systematic name: 1,1,1′,1′-tetraoxo-2,2′-(oxydimethylene)bi(1,2-benzothiazol-3-one)], C16H12N2O7S2, the benzisothiazole ring systems are individually planar [maximum deviations of 0.0497 (13) and 0.0195 (19) Å] and their mean planes are inclined at a dihedral angle of 62.76 (4)°. The crystal structure is stabilized by weak intermolecular C—H...O interactions. Two O atoms bonded to two S atoms and four aryl H atoms belonging to two symmetry-related molecules lying about an inversion center form a hydrogen-bonded 10-membered ring with graph-set notation R42(10).

In the title compound, C15H11ClN2O4S, there are two independent molecules in the asymmetric unit, in which the heterocyclic thiazine rings in both molecules adopt half-chair conformations. The conformations about the C—C and C—N bonds in the central C—C—N—C chain in both molecules are all EZ. There are strong intramolecular O—H...O and N—H...N hydrogen bonds resulting in graph-set patterns S(6) and S(5) for the oxo and amino rings, in addition to intramolecular N—H...Cl interactions. In the crystal structure, molecules are linked by intermolecular O—H...O and N—H...O hydrogen bonds into chains along [100].

In the title compound [systematic name: 2-(2-oxopropyl)-1,2-benzothiazol-3(2H)-one 1,1-dioxide], C10H9NO4S, the benzothiazole unit is essentially planar [maximum deviation = 0.0490 (9) Å for the S atom] and the oxopropyl group is inclined at an angle 75.61 (8)° with respect to its mean plane. In the crystal, molecules are held together by weak intermolecular C—H...O non-classical hydrogen bonds, resulting in centrosymmetric dimeric units, forming 14-membered ring systems which may be described as R22(14) ring motifs. Moreover, molecules lying about inversion centers show π–π interactions, with centroid–centroid separations between the benzene rings of 3.676 (2) Å.

In the title salt, C6H14NO+·C7H6NO4S−, the 2-sulfamoylbenzoate anion has two intramolecular hydrogen bonds, forming a five membered C—H...O and a seven-membered N—H...O twisted ring with ring motifs S(5) and S(7), respectively, while the 2-methyl-4-oxopentan-2-aminium cation also has a stabilizing intramolecular N—H...O hydrogen bond with a twisted S(6) ring motif. The anions form inversion-related dimers with R22(8) ring motifs through intermolecular N—H...O hydrogen bonding. The dimers and cations are further linked and stabilized through intermolecular N—H...O and C—H...O bonds, forming zigzag-shaped layers that extend along the crystallographic a axis.

In the title compound, C10H12N2O6S, the nitro group is twisted slightly out of the plane of the aromatic ring, forming a dihedral angle of 20.79 (1)°. In the crystal, the molecules arrange themselves as a chain along the a axis through intermolecular C—H...O interactions.

1,2-Benzothiazines similar to the title compound, C18H18N2O4S, are well known in the literature for their biological activities and are used as medicines in the treatment of inflammation and rheumatoid arthritis. The thiazine ring adopts a distorted half-chair conformation. The enolic H atom is involved in an intramolecular O—H...O hydrogen bond, forming a six-membered ring. In the crystal, molecules arrange themselves into centrosymmetric dimers by means of pairs of weak intermolecular N—H...O hydrogen bonds.

In the molecule of the title compound, C13H10INO4S·H2O, the coordination around the S atom is distorted tetrahedral. The aromatic rings are oriented at a dihedral angle of 74.18 (17)°. Intramolecular C—H...O hydrogen bonds result in the formation of non-planar five- and six-membered rings, which adopt envelope and twist conformations, respectively. In the crystal structure, intermolecular N—H...O, O—H...O and C—H...O hydrogen bonds link the molecules. π–π Contacts between the phenyl rings [centroid–centroid distance = 3.726 (3) Å] may further stabilize the structure. There is also a C—H...π interaction.

The title compound, C16H11BrClN3, contains pairs of molecules lying about inversion centers linked by amino–pyrimidine N—H...N hydrogen bonds. The eight-membered rings thus formed are represented by the R22(8) motif in graph-set notation. The second H atom of the amine group shows a rather weak interaction with two Br atoms, resulting in bifurcated N—H...(Br,Br) hydrogen bonds. The dihedral angles between the mean planes of the benzene rings and the mean plane of the heterocyclic ring are 8.98 (15) and 35.58 (10)°. The Br and Cl atoms show substitutional disorder, with site-occupancy factors of 0.599 (2) and 0.401 (2), respectively.

In the molecule of the title compound, C13H9ClINO4S, the coordination around the S atom is distorted tetrahedral. The aromatic rings are oriented at a dihedral angle of 74.46 (9)°. Intramolecular C—H...O hydrogen bonds result in the formation of two five- and one six-membered rings, which adopt planar, envelope and twisted conformations, respectively. In the crystal structure, intermolecular N—H...O and O—H...O hydrogen bonds link the molecules to form R22(8) ring motifs, which are further linked by C—H...O hydrogen bonds. π–π contacts between the benzene rings [centroid–centroid distances = 3.709 (3) and 3.772 (3) Å] may further stabilize the structure. The I atom is disordered over two positions, refined with occupancies of ca 0.75 and 0.25.

In the title compound, Na+·C6H4IO3S−·H2O, the Na atom is hexacoordinated by O atoms, forming a two-dimensional sheet-like structure in the bc plane, with the iodobenzene rings protruding above and below. Na...O contact distances are in the range 2.419 (2)–2.7218 (18) Å and O...Na...O angles are in the range 73.70 (5)–158.64 (7)°. The crystal structure is stabilized by O—H...O and C—H...O hydrogen bonds and C—H...π interactions. The I atom is disordered over two positions with occupancies of 0.78 (2) and 0.22 (2).

In the molecule of the title compound, C10H9NO6S·H2O, the benzothiazine ring adopts an envelope conformation. An intramolecular N—H...O hydrogen bond results in the formation of a nonplanar five-membered ring which has a twisted conformation. In the crystal structure, intermolecular N—H...O, O—H...O and C—H...O hydrogen bonds link the molecules to form a three-dimensional network. There is a π–π contact between the benzene rings [centroid–centroid distance = 3.972 (2) Å].

In the title compound, [Mn(C7H6NO4S)2(H2O)4], the Mn atom, lying on an inversion center, exhibits a distorted octahedral coordination by six O atoms, two from carboxylate groups and four from water molecules. The SO2NH2 group is involved in a three dimensional polymeric hydrogen bonding network along with the water molecules. π-Stacking interactions parallel to the c axis lead to a separation of 4.0050 (12) Å between the centroids of the benzene rings.

The asymmetric unit of the title compound, C10H9NO5S, contains two independent molecules. The heterocyclic thiazine rings in both molecules adopt half-chair conformations, with the S atoms in each molecule displaced by 0.455 (3) and 0.539 (3) Å and the N atoms displaced in the opposite direction by 0.214 (3) and 0.203 (3) Å, from the planes defined by the remaining ring atoms. The crystal structure is stabilized by O—H...O, N—H...O and C—H...O hydrogen bonds involving both inter- and intramolecular interactions.

In the title molecule, C9H9NO3S2, the essentially planar benzisothiazole ring system and the C—S—C atoms of the methylsulfanyl side chain form an angle of 64.45 (7)°. The structure is devoid of any classical hydrogen bonding. However, weak non-classical inter- and intramolecular hydrogen bonds of the type C—H...O are present.

In the molecule of the title compound, C10H9Br2NO3S, the S atom is four-coordinated in distorted tetrahedral configuration. The heterocyclic thiazine ring adopts a twist conformation. An intramolecular C—H...O hydrogen bond results in the formation of a non-planar five-membered ring. In the crystal structure, intermolecular C—H...O hydrogen bonds link the molecules into infinite chains along the c axis.

The title molecule, C10H9NO5S, is composed of two essentially planar units with a dihedral angle of 89.16 (6)° between them. In the crystal structure, there are weak intermolecular C—H...O interactions resulting in dimeric pairs of molecules about inversion centres and chains of molecules extended along the a and c axes, thus stabilizing the structure. In addition, benzothiazole rings lying parallel to each other with centroid–centroid distances of 3.679 (2) and 3.999 (2) Å indicate the existence of π–π stacking interactions.

In the crystal structure of the title compound, C9H9NO3S, there is distorted tetrahedral geometry around the S atom. The sulfonyl group is almost normal to the benzene ring, while the carbonyl O atom and methyl C atom are on opposite sides of this ring. The heterocyclic ring adopts a half-boat conformation with the S atom out of the plane. The molecules are dimerized by hydrogen bonding involving the benzene ring and the sulfonyl group. These dimers are linked to each other in the same way. There is an intramolecular hydrogen bond between a methyl C—H group and a sulfonyl O atom, and a π–π interaction between the aromatic rings of two dimers at a centroid-to-centroid distance of 3.6373 (13) Å.

In the title compound, C10H11NO3S, there is distorted tetrahedral geometry around the S atom. The heterocyclic thiazine ring adopts a half-chair conformation. The ethyl and sulfonyl groups form dihedral angles of 82.53 (13) and 88.91 (9)°, respectively, with the plane formed by the benzothiazine ring, excluding the S atom; the S atom and the ethyl group lie on opposite sides of the ring. The molecules are linked into dimers by intermolecular C—H...O hydrogen bonds involving benzene C—H and carbonyl O atoms, thus forming eight-membered rings. The dimers are linked into chains via interactions of a similar type. There is an intramolecular C—H...O hydrogen bond.

In the molecule of the title compound, C11H15NO4S, the S atom environment is distorted tetrahedral. The methoxycarbonyl group is oriented at a dihedral angle of 11.8 (2)° with respect to the benzene ring. In the crystal structure, intermolecular C—H...O hydrogen bonds link the molecules into centrosymmetric dimers.