2-{1-[(2-Nitro­benzene­sulfonamido)­meth­yl]cyclo­hexyl}acetic acid

In the title compound, C₁₅H₂₀N₂O₆S, the C—SO₂—NH—C torsion angle is 64.54 (14)°. In the mol­ecule, there is a bifurcated N—H...(O,O) hydrogen bond, forming S(7) rings. In the crystal, inversion dimers are formed via O—H...O hydrogen bonds involving the carboxyl group, so forming R₂²(8) rings. These dimers are further linked via pairs of C—H...O hydrogen bonds, forming a C(6) chain propagating along the c-axis direction.

(Z)-2-Meth­oxy-N-[(5-nitro­thio­phen-2-yl)methyl­idene]aniline

The dihedral angle between the benzene and thio­phene rings in the title compound, C₁₂H₁₀N₂O₃S, is 27.94 (13)°. An inter­molecular C—H...π inter­action contributes to the stability of the crystal structure.

2-Amino-5-nitro­benzoic acid

In the title compound, C₇H₆N₂O₄, an intra­molecular N—H...O hydrogen bond generates an S(6) ring. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R₂²(8) loops. Inter­molecular N—H...O and C—H...O hydrogen bonds then link the dimers, generating R₃³(16)R₂¹(6) motifs. The whole mol­ecule is essentially planar, with the greatest deviation from the mean plane being 0.065 (2) Å.

(E)-2-{[(2-(Trifluoro­meth­yl)phen­yl]imino­meth­yl}phenol

In the crystal of the title compound, C₁₄H₁₀F₃NO, intra­molecular O—H...N and O—H...F hydrogen bonds generate S(6) and S(10) intramolecular hydrogen-bonded rings. The dihedral angle between the planes of the aromatic rings is 13.00 (14)°.

2-Amino-3-(hy­droxy­meth­yl)pyridinium 2-benzoyl­benzoate monohydrate

In the title hydrated salt, C₆H₉N₂O⁺·C₁₄H₉O₃⁻·H₂O, the dihedral angle between the benzene rings of the 2-benzoyl­benzoate anion is 82.04 (14)°, while the angles between the aromatic ring of the pyridinium cation and each of the benzene rings of the anion are 4.42 (14) and 82.04 (14)°. In the crystal, mol­ecules are linked by N—H...O and O—H...O hydrogen bonds, generating a three-dimensional network with R₂²(8), R₆⁶(16) and R₄⁴(6) motifs. The crystal packing is further stabilized by two π–π inter­actions, one between pyridinium rings, and another between the benzene benzoate and pyridinium rings of neighbouring mol­ecules, with centroid-to-centroid distances of 3.559 (2) and 3.606 (2) Å, respectively.

(3aR*,6S*,7aR*)-7a-Chloro-6-methyl-2-(4-methyl­phenyl­sulfon­yl)-2,3,3a,6,7,7a-hexa­hydro-3a,6-ep­oxy-1H-isoindole

In the title compound, C₁₆H₁₈ClNO₃S, the six-membered ring has a boat conformation. The two five-membered rings with the bridging O atom adopt envelope conformations, whereas the N-containing five-membered ring adopts a twisted conformation. In the crystal, C—H...O hydrogen bonds link the mol­ecules into a three-dimensional network.

2-Amino-3-[(E)-(2-hy­droxy-3-methyl­benzyl­idene)amino]­but-2-ene­dinitrile

The title compound, C₁₂H₁₀N₄O, is a Schiff base obtained from the condensation of diamino­maleonitrile and 2-hy­droxy-3-methyl­benzaldehyde. The mol­ecule is roughly planar, with an r.m.s. deviation of 0.0354 Å, and adopts the phenol–imine tautomeric form. An intra­molecular O—H...N hydrogen bond involving the O—H group and the azomethine N atom generates an S(6) ring. In the crystal, there are two N—H...N hydrogen bonds.

1-(Adamantan-1-yl)-3-(4-fluoro­phen­yl)thio­urea

In the title mol­ecule, C₁₇H₂₁FN₂S, the mean planes of the benzene ring and the thio­urea fragment form a dihedral angle of 61.93 (9)°. In the crystal, pairs of weak N—H...S inter­actions link the mol­ecules, forming inversion dimers.

3-Anilinomethyl-5-chloro-1,3-­benzoxazol-2(3H)-one

In the title compound, C₁₄H₁₁ClN₂O₂, the 2,3-dihydro-1,3-benzoxazole ring system is essentially planar [maximum deviation = 0.009 (2) Å] and makes a dihedral angle of 79.15 (7)° with the phenyl ring. Inter­molecular N—H...O and weak C—H...Cl hydrogen bonds occur in the crystal structure.

4-Chloro-2-[(4-chloro­benzyl­idene)amino]­phenol

In the title Schiff base compound, C₁₃H₉Cl₂NO, the mol­ecule displays an E conformation about the imine C=N double bond, with a dihedral angle of 8.09 (11)° between the two benzene rings. In the crystal, mol­ecules are linked by a single O—H...O hydrogen bond, giving one-dimensional chains which extend along (100).

1-{[(2,3-Dihydro-1H-inden-2-yl)­oxy]meth­yl}quinazoline-2,4(1H,3H)-dione

In the title mol­ecule, C₁₈H₁₆N₂O₃, the five-membered ring has an envelope conformation, with the substituted C atom deviating by 0.342 (4) Å from the mean plane P calculated for the remainder of the non-H atoms of the 2,3-dihydro-1H-indene fragment. The mean planes of quinazoline-2,4(1H,3H)-dione fragment and P form a dihedral angle of 59.08 (4)°. In the crystal, pairs of N—H...O hydrogen bonds link mol­ecules into inversion dimers, and weak C—H...O hydrogen bonds and π–π inter­actions between the benzene rings of the quinazoline ring systems [centroid–centroid distance = 3.538 (3) Å] further consolidate the packing.

3,4-Dimeth­oxy-N-((E)-4-{[1-(prop-2-en-1-yl)-1H-1,2,3-triazol-4-yl]meth­oxy}benzyl­idene)aniline

In the title compound, C₂₁H₂₂N₄O₃, the triazole ring is planar [maximum deviaton = 0.004 (1) Å] and makes dihedral angles of 26.21 (8) and 38.66 (8)° with the two benzene rings. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming zigzag chains along [1-11]. In addition, a weak C—H...π intreraction is also observed.

1-{[Dimeth­yl(phen­yl)sil­yl]meth­yl}-3-(2-phenyl­eth­yl)-1H-benzimidazol-3-ium bromide monohydrate

The title compound, C₂₄H₂₇N₂Si⁺·Br⁻·H₂O, was synthesized from 1-(dimethyl­phenyl­silylmeth­yl)-1H-benzimidazole and (2-bromo­eth­yl)benzene in dimethyl­formamide. The benzimidazole ring system is nearly planar, with a maximum deviation of 0.015 (5) Å, and forms dihedral angles of 73.0 (3) and 39.6 (2)°, with the phenyl rings. In the crystal, mol­ecules are linked by O—H...Br, C—H...Br and C—H...O hydrogen bonds. In addition, the structure features π–π stacking inter­actions, with a face-to-face separation of 3.644 (3) Å between parallel benzimidazole ring systems.

1-[4-(4-Chloro­phen­yl)piperazin-1-yl]-3-(6-oxo-3,4-diphenyl-1,6-dihydro­pyridazin-1-yl)propan-1-one

In the title compound, C₂₉H₂₇ClN₄O₂, the six-membered ring of the pyridazine group is nearly planar [maximum deviation = −0.062 (2) Å] and its mean plane makes dihedral angles of 43.05 (9), 44.71 (10) and 72.57 (9)°, respectively, with the two phenyl and benzene rings. The piperazine ring has a chair conformation and its mean plane is almost perpendicular to the attached benzene ring, with a dihedral angle of 83.20 (16)°. In the crystal, mol­ecules are linked via two pairs of C—H...O inter­actions, which result in the formation of chains propagating along [10-1]. Neighbouring chains are linked via C—H...π inter­actions.

2-[(Anilino)(2-nitro­phen­yl)meth­yl]cyclo­hexa­none

In the title compound, C₁₉H₂₀N₂O₃, the cyclo­hexa­none ring adopts a chair conformation with the amino­methyl group is positioned equatorially. An intra­molecular N—H...O hydrogen bond occurs. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds.

5-Chloro-N-{4-oxo-2-[4-(trifluoro­meth­yl)phen­yl]-1,3-thia­zolidin-3-yl}-3-phenyl-1H-indole-2-carboxamide

In the title compound, C₂₅H₁₇ClF₃N₃O₂S, the five-membered 1,3-thia­zolidine ring adopts a twist conformation. The three F atoms of the CF₃ group are disordered over two sets of sites with refined occupancies of 0.542 (18) and 0.458 (18). In the nine-membered 1H-indoline ring system, the 1H-pyrrole ring forms a dihedral angle of 4.7 (2)° with the benzene ring, while it is twisted at an angle of 46.5 (2)° with respect to the attached phenyl ring. The dihedral angle between the phenyl and trifluoro­methyl-substituted benzene rings is 56.0 (2)°. In the crystal, N—H...O hydrogen bonds connect the mol­ecules into a three-dimensional network. In addition, weak C—H...O hydrogen bonds and weak C—H...π inter­actions are observed.