2-[(2,4,4,6,6-Penta­chloro-1,3,5,2λ⁵,4λ⁵,6λ⁵-triaza­triphosphinin-2-yl)aza­nid­yl]pyridinium

The title compound, C₅H₅Cl₅N₅P₃, crystallizes as a zwitterion in which the pyridine N atom is protonated. An S(6) ring motif is formed via an intra­molecular C—H...N hydrogen bond. The triaza­triphosphinine ring adopts an envelope conformation, with one N atom displaced by 0.145 (1) Å from the other atoms. In the crystal, N—H...N and C—H...N hydrogen bonds link the mol­ecules into centrosymmetric dimers containing one R₂²(7) ring motif and two R₂²(8) ring motifs.

2-(8-Bromo­imidazo[1,2-a]pyridin-2-yl)-N′-[(E)-4-diethyl­amino-2-hy­droxy­benzyl­idene]acetohydrazide dihydrate

In the title compound, C₂₀H₂₂BrN₅O₂·2H₂O, the Schiff base mol­ecule exists in an E conformation with respect to the acyclic C=N bond. An S(6) ring motif is formed via an intra­molecular O—H...N hydrogen bond. The dihedral angle between the imidazo[1,2-a]pyridine system and the benzene ring is 84.62 (5)°. In the crystal, N—H...O, O—H...O, O—H...N, C—H...O and C—H...Br hydrogen bonds link the mol­ecules into a three-dimensional network. The crystal packing is further stabilized by C—H...π and π–π inter­actions [centroid–centroid distance = 3.5365 (7) Å].

Diethyl 4-[5-(4-chloro­phen­yl)-1H-pyrazol-4-yl]-2,6-dimethyl-1,4-dihydro­pyridine-3,5-dicarboxyl­ate

In the title compound, C₂₂H₂₄ClN₃O₄, intra­molecular C—H...O and C—H...N hydrogen bonds form S(9) and S(7) ring motifs, respectively. The 1,4-dihydro­pyridine ring adopts a flattened boat conformation. The benzene ring makes a dihedral angle of 33.36 (6)° with the pyrazole ring. In the crystal, pairs of N—H...N hydrogen bonds link the mol­ecules into inversion dimers. The dimers are stacked in column along the a axis through N—H...O and C—H...N hydrogen bonds. The crystal packing also features C—H...π inter­actions involving the pyrazole ring.

N-(3-Chloro-4-fluoro­phen­yl)acetamide

In the title compound, C₈H₇ClFNO, the dihedral angle between the benzene ring and the acetamide side chain is 5.47 (6)°. An S(6) ring motif is formed via an intra­molecular C—H...O hydrogen bond. In the crystal, N—H...O hydrogen bonds link the mol­ecules into C(4) chains along [001].

(2E)-3-(4-Cyano­phen­yl)-1-(4,4′′-difluoro-5′-meth­oxy-1,1′:3′,1′′-terphenyl-4′-yl)prop-2-en-1-one

In the title compound, C₂₉H₁₉F₂NO₂, the central benzene ring forms a dihedral angle of 56.92 (12)° with the cyano­benzene ring and dihedral angles of 40.91 (12) and 44.76 (12)° with the two fluoro­benzene rings. In the crystal, C—H...O and C—H...F hydrogen bonds link the mol­ecules into sheets lying parallel to the ab plane. The crystal packing also features C—H...π inter­actions involving the central benzene ring.

(2E)-1-(4,4′′-Difluoro-5′-meth­oxy-1,1′:3′,1′′-terphenyl-4′-yl)-3-(2-fluoro­phen­yl)prop-2-en-1-one

In the title compound, C₂₈H₁₉F₃O₂, the central benzene ring forms dihedral angles of 48.69 (6), 60.93 (6) and 42.06 (6)° with the fluoro­benzene rings. In the crystal, inter­molecular C—H...O and C—H...F hydrogen bonds link the mol­ecules, forming an undulating two-dimensional network parallel to the bc plane. C—H...π inter­actions further consolidate the crystal packing.

N′-[(E)-4-Chloro­benzyl­idene]pyridine-4-carbohydrazide monohydrate

The asymmetric unit of the title compound, C₁₃H₁₀ClN₃O·H₂O, consists of two crystallographically independent Schiff base mol­ecules which exist in an E conformation with respect to the C=N double bond, and two independent water mol­ecules. In the crystal, the Schiff base and water mol­ecules are linked into a three-dimensional network via N—H...O, O—H...N, O—H...O and C—H...O hydrogen bonds. The crystal studied was a pseudo-merohedral twin with twin law (101 0-10 00-1) and a component ratio of 0.792 (2):0.208 (2).

1-[2,6-Dichloro-4-(trifluoro­meth­yl)phen­yl]-3,4-dimethyl­pyrano[2,3-c]pyrazol-6(1H)-one

In the title compound, C₁₅H₉Cl₂F₃N₂O₂, the 1,6-dihydro­pyrano[2,3-c]pyrazole ring system is almost planar, with a maximum deviation of 0.0226 (14) Å, and forms a dihedral angle of 69.90 (6)° with the benzene ring. In the crystal, mol­ecules are linked into a helical chain along the c axis by C—H...O hydrogen bonds.

N-(4-Chloro­phen­yl)-2,2-diphenyl­acetamide

In the title compound, C₂₀H₁₆ClNO, an S(6) ring motif is formed via an intra­molecular C—H...O hydrogen bond. The chloro-substituted benzene ring is almost perpendicular to the benzene rings, forming dihedral angles of 87.33 (9) and 88.69 (9)°. The dihedral angle between the benzene rings is 87.17 (9)°. In the crystal, mol­ecules are linked into chains parallel to the c axis by inter­molecular N—H...O hydrogen bonds. The crystal packing also features weak C—H...π inter­actions involving the chloro-substituted ring.

1-[5-(4-Bromo­phen­yl)-3-(4-fluoro­phen­yl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone

In the title mol­ecule, C₁₇H₁₄BrFN₂O, the benzene rings form dihedral angles of 6.58 (6) and 85.31 (6)° with the mean plane of the 4,5-dihydro-1H-pyrazole ring (r.m.s. deviation = 0.0231 Å). The latter ring is planar with a maximum deviation of 0.032 (1) Å The dihedral angle between the benzene rings is 78.75 (6)°. In the crystal, weak C—H...O and C—H...F hydrogen bonds link the mol­ecules into corrugated layers parallel to the ab plane.

1-[5-(4-Bromo­phen­yl)-3-(4-fluoro­phen­yl)-4,5-dihydro-1H-pyrazol-1-yl]butan-1-one

In the title compound, C₁₉H₁₈BrFN₂O, the benzene rings form dihedral angles of 5.38 (7) and 85.48 (7)° with the mean plane of the 4,5-dihydro-1H-pyrazole ring (r.m.s. deviation = 0.0849 Å), which approximates to an envelope conformation with the –CH₂– group as the flap. The dihedral angle between the benzene rings is 82.86 (7)°. In the crystal, C—H...F and C—H...O hydrogen bonds link the mol­ecules to form inversion dimers and together these generate chains along [011]. The crystal packing also features C—H...π inter­actions.

2-Cyclo­pentyl­idenehydrazine­carboxamide

The asymmetric unit of the title compound, C₆H₁₁N₃O, consists of two independent mol­ecules in which the cyclo­pentane rings adopt envelope conformations with CH₂ grouping as the flap and the semicarbazone groups are essentially planar, with maximums deviation of 0.0311 (12) and 0.0285 (12) Å. In the crystal, N—H...O, N—H...N and C—H...O hydrogen bonds link the mol­ecules to form sheets lying parallel to the ab plane.

2-(4-Meth­oxy­phenyl)-2-oxoethan­aminium chloride

In the cation of the title compound, C₉H₁₂NO₂⁺·Cl⁻, the dihedral angle between the 2-oxoethanaminium N—C—C(=O)– plane [maximum deviation = 0.0148 (12) Å] and the benzene ring is 7.98 (8)°. The meth­oxy group is approximately in-plane with the benzene ring, with a C—O—C—C torsion angle of −2.91 (18)°. In the crystal, the cations and chloride anions are connected by N—H...Cl and C—H...Cl hydrogen bonds, forming a layer parallel to the bc plane. A C—H...π inter­action further links the layers.

(2E)-1-[2,3-Dichloro-6-methyl-5-(trifluoro­meth­yl)phen­yl]-2-(1-phenyl­ethyl­idene)hydrazine

The title compound, C₁₆H₁₃Cl₂F₃N₂, exists in an E conformation with respect to the C=N bond [1.2952 (11) Å] and the C—N—N=C torsion angle is 175.65 (8)°. The dihedral angle between the benzene rings is 42.09 (4)°. An intra­molecular C—H...F hydrogen bond generates an S(6) ring. In the crystal, the mol­ecules are linked into [101] chains by C—H...F hydrogen bonds.