2-{(E)-[(2Z)-(3-Chloro-1-methyl-2,2-di­oxo-3,4-dihydro-1H-2,1-benzo­thia­zin-4-yl­idene)hydrazinyl­idene]meth­yl}phenol

In the title compound, C₁₆H₁₄ClN₃O₃S, the thia­zine ring adopts a sofa (half-chair) conformation, with an r.m.s. deviation from the mean plane of 0.23 Å. The S atom and S-bonded C atom exhibit the maximum deviations from the thia­zine mean plane [−0.3976 (12) and 0.3179 (14) Å, respectively]. The conformations around the double bonds in the R₂C=N—N=CHR unit are Z and E. An intra­molecular O—H...N hydrogen bond with the hy­droxy group as donor generates an S(6) ring motif. In the crystal, pairs of weak C—H...O inter­actions connect the mol­ecules, forming inversion dimers.

N′-[(Z)-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)methyl­idene]-2-hy­droxy­benzohydrazide

In the title compound, C₁₉H₁₈N₄O₃, the pyrazole ring is oriented at dihedral angles of 41.12 (7) and 12.25 (10)°, respectively, with respect to the planes of the phenyl and benzene rings. Intra­molecular N—H...O and O—H...O hydrogen bonds generate seven- and six-membered S(7) and S(6) ring motifs, respectively.

Methyl 1-ethyl-7-methyl-4-oxo-1,4-di­hydro-1,8-naphthyridine-3-carboxyl­ate monohydrate

In the structure of the title compound, C₁₃H₁₄N₂O₃·H₂O, all atoms of the organic molecule except the terminal methyl group of the ethyl group attached to the N atom of the pyridinone ring are roughly coplanar, with an r.m.s. deviation of 0.0897 Å. In the crystal, C—H...O contacts link pairs of naphthyridine mol­ecules into head-to-tail dimers. These are joined by strong O—H...O hydrogen bonds from the water molecules into infinite chains along the a axis.

[4,4′-(Ethane-1,2-diyldinitrilo)­bis­(pent-2-en-2-olato)]copper(II) 0.25-hydrate

In the title compound, [Cu(C₁₂H₁₈N₂O₂)]·0.25H₂O, the coordination of the O,N,N′,O′-tetra­dentate ligand results in a cis-CuN₂O₂ square-planar geometry for the metal ion and the presence of two six-membered and one five-membered chelate rings. The complete complex mol­ecule is close to planar (r.m.s. deviation = 0.047 Å). The uncoordinated water mol­ecule (O-atom site symmetry 2) was modelled as half occupied. In the crystal, C—H...O_w and O_w—H...O (w = water) hydrogen bonds link the components into layers parallel to ab plane.

1-[(Z)-1-Ferrocenyl­ethyl­idene]thio­carbonohydrazide

In the title compound, [Fe(C₅H₅)(C₈H₁₁N₄S)], the cyclo­penta­dienyl (Cp) rings of the ferrocene unit are close to being eclipsed. They are inclined to one another at an angle of 1.95 (2)° and lie 3.309 (2)Å away from each other. The ethyl­idene­thio­carbonohydrazide fragment is planar, with an r.m.s. deviation of 0.0347 (2) Å from the mean plane of its eight non-H atoms, and makes dihedral angles of 21.78 (1) and 19.97 (1)° with respect to the two Cp rings. The mol­ecule adopts a trans geometry about the C=N double bond. In the crystal, N—H...(N/S) and C—H...S inter­actions stack the mol­ecules in an inverse fashion along the b axis.

cis-Dichloridobis(N,N,N′,N′-tetra­methyl­ethane-1,2-diamine)­platinum(II)

In the title complex, [PtCl₂(C₆H₁₆N₂)], the Pt^II atom adopts a distorted cis-PtN₂Cl₂ square-planar coordination geometry. The five-membered chelate ring adopts a twisted conformation. In the crystal, weak C—H...Cl hydrogen bonds link the mol­ecules into (001) sheets.

Methyl 2-butyl-4-hy­droxy-1,1-dioxo-2H-1,2-benzothia­zine-3-carboxyl­ate

In the title compound, C₁₄H₁₇NO₅S, the thia­zine ring adopts a half-chair conformation. The mol­ecule exhibits an intra­molecular O—H...O hydrogen bond, which forms a six-membered S(6) ring motif. The planes of the benzene and thia­zine rings are inclined at a dihedral angle of 15.30 (12)°.

Methyl 2-(but-3-en­yl)-4-hy­droxy-1,1-dioxo-2H-1λ⁶,2-benzothia­zine-3-carboxyl­ate

In the title compound, C₁₄H₁₅NO₅S, the thia­zine ring adopts a sofa conformation and an intra­molecular O—H...O hydrogen bond forms an S(6) ring. In the crystal, molecules are linked viaC—H...O inter­actions.

1-Ethyl-4-[1-(1-phenyl­ethyl­idene)hydrazin-2-yl­idene]-3,4-dihydro-1H-2λ⁶,1-benzothia­zine-2,2-dione

In the title compound, C₁₈H₁₉N₃O₂S, the thia­zine ring adopts an envelope conformation, with the S atom displaced by 0.732 (1) Å from the other atoms of the ring. The phenyl ring is oriented at a dihedral angle of 79.33 (7)° with respect to the fused benzene ring. The conformations about the two double bonds in the R₂C=N—N=C(CH₃)Ar grouping are Z and E, respectively. In the crystal, inversion dimers linked by pairs of C—H...O inter­actions generate R₂²(8) and R₂²(12) loops, as parts of infinite chains along the a-axis direction.

6-Bromo-4-(2-cyclo­hexyl­idenehydrazin-1-yl­idene)-1-methyl-2,2-dioxo-3,4-dihydro-1H-2λ⁶,1-benzothia­zine

The asymmetric unit of the title compound, C₁₅H₁₈BrN₃O₂S, contains two independent mol­ecules in both of which the (thia­zine)C=N—N double bond exhibits an E conformation. The cyclo­hexyl rings adopt chair conformations while the thia­zine rings are in sofa conformations. The mean planes of these rings are oriented at dihedral angles of 64.43 (13) and 28.6 (2)° in the two independent mol­ecules while the aromatic and thia­zine rings are twisted by dihedral angles of 8.73 (8) and 13.07 (2)°, respectively. In the crystal, C—H...O and C—H...Br inter­actions connect mol­ecules into chains propagating along the a axis.

N-(2,3-Dihydro-1,4-benzodioxin-6-yl)-4-fluoro­benzene­sulfonamide

In the title compound, C₁₄H₁₂FNO₄S, the dihedral angle between the aromatic rings is 50.26 (9)° and the C—S—N—C bond adopts a gauche conformation [torsion angle = −68.12 (15)°]. The dihydro­dioxine ring is disordered over two orientations, which both approximate to half-chairs, in a 0.880 (7):0.120 (7) ratio. In the crystal, N—H...O hydrogen bonds link the mol­ecules into C(4) chains propagating in [100]. Weak C—H...O and C—H...F inter­actions consolidate the packing.

2,5-Dichloro-N-(3-methyl­phen­yl)benzenesulfonamide

In the title compound, C₁₃H₁₁Cl₂NO₂S, the dihedral angle between the aromatic rings is 76.62 (10)° and the C—S—N—C linkage between the rings adopts a gauche conformation [torsion angle = −51.4 (2)°]. A weak intra­molecular C—H...O inter­action closes an S(6) ring. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R₂²(8) loops.

4-Methyl-2-(2-nitro­benzene­sulfon­amido)­penta­noic acid

In the title compound, C₁₂H₁₆N₂O₆S, the S atom adopts a distorted tetra­hedral geometry with an O—S—O angle of 119.76 (13)°. The nitro group is twisted by 35.34 (2)° with respect to the aromatic ring; it accepts an N—H...O hydrogen bond, resulting in a S(7) motif. In the crystal, N—H...O and O—H...O hydrogen bonds connect the mol­ecules into an infinite chain along the a axis. The methyl C atoms of the isopropyl group are disordered in a 1:1 ratio.

2-Benzene­sulfonamido-3-methyl­butyric acid

In the crystal structure of the title compound, C₁₁H₁₅NO₄S, two independent mol­ecules are present per asymmetric unit; they are dimerized through O—H...O hydrogen bonds between their carb­oxy groups to generate R₂²(8) loops. An intra­molecular N—H...O link in one of the mol­ecules closes an S(5) ring. The dimers are linked by N—H...O and C—H...O hydrogen bonds to form a three-dimensional network. The C atoms of the isopropyl group of one of the mol­ecules are disordered over two orientations in a 3:1 ratio.

Ethyl 2-benzene­sulfonamido-4-methyl­penta­noate

In the title compound, C₁₄H₂₁NO₄S, the O—S—O angle is 120.06 (11)°, with the S atom adopting a distorted tetra­hedral geometry. In the crystal, N—H...O hydrogen bonds connect the mol­ecules along the a axis, generating an infinite chain. The disordered C atoms of the isobutyl group were refined with the C—C distances restrained to 1.52 (1) Å and the occupancy ratio refined to 0.504 (3):0.496 (3).

1-(Benzotriazol-1-yl)-2-bromoethanone

In the title compound C₈H₆BrN₃O, the benzotriazole ring is essentially planar (r.m.s. deviation = 0.0034 Å) and the bromo­acetyl unit is twisted at a dihedral angle of 15.24 (16)° with respect to it. In the crystal, pairs of C—H...O hydrogen bondings result in the formation of inversion dimers, forming R₂²(12) rings, which are connected by further C—H...O inter­actions into chains extending along the b-axis direction.

1-(1H-1,2,3-Benzotriazol-1-yl)-2-(4-meth­oxy­phen­yl)ethanone

In the title compound, C₁₅H₁₃N₃O₂, the dihedral angle between the benzotriazole ring system (r.m.s. deviation = 0.0124 Å) and the benzene ring is 76.21 (3)°. The meth­oxy C atom deviates from its benzene ring plane by 0.063 (2)Å. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds generate R₂²(12) loops.

Ethyl (Z)-2-chloro-2-[2-(4-meth­oxy­phenyl)hydrazin-1-yl­idene]acetate

The mol­ecule of the title compound, C₁₁H₁₃ClN₂O₃, is planar (r.m.s. deviation = 0.0587 Å for non-H atoms) and adopts a Z conformation about the C=N double bond. In the crystal, mol­ecules are linked via an N—H...O hydrogen bond, forming zigzag chains propagating along [010]. These chains are consolidated by C—H...O hydrogen bonds.

(Z)-Ethyl 2-chloro-2-[2-(4-methyl­phen­yl)hydrazinyl­idene]acetate

The mol­ecule of the title compound, C₁₁H₁₃ClN₂O₂, is approximately planar (r.m.s. deviation = 0.099 Å for non-H atoms) and adopts a Z conformation about the C=N double bond. In the crystal, mol­ecules are linked by N—H...O and C—H...O hydrogen bonds to the same O-atom acceptor, forming zigzag chains propagating along [010]. These inter­actions give rise to R₂¹(6) loops.