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In the title compound, C20H25NO2, the cyclo­hexyl ring adopts a slightly disordered chair conformation. The dihedral angle between the mean planes of the quinoline ring and the carboxyl­ate group is 22.2 (6)°. In the crystal, weak C—H...N inter­actions make chains along [010].

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In the title compound, C9H10N4OS, the dihedral angle between the benzene and 1H-1,2,4-triazole-5(4H)-thione rings is 67.51 (16)°. In the crystal, mol­ecules are liked via N—H...O hydrogen bonds, forming chains along the c-axis direction. The chains are linked via O—H...S hydrogen bonds, forming corrugated layers lying parallel to the bc plane. The layers are linked via N—H...N and N—H...S hydrogen bonds, forming a three-dimensional network.

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In the title compound, C10H9ClN4S, the dihedral angle between the mean planes of the phenyl and 1H-1,2,4-triazole-5(4H)-thione rings is 25.3 (9)°. The latter ring is essentially planar, with maximum deviations of 0.010 and −0.010 Å for the ring N atom in the 4-position and ring C atom bearing the methyl group, respectively. An intra­molecular C—H...S contact occurs. In the crystal, pairs of weak N—H...S inter­actions link the mol­ecules into inversion dimers in the ac plane, forming R22(8) graph-set motifs. In addition, weak π–π inter­actions [centroid–centroid distances = 3.3463 (14) and 3.6127 (13)Å] are observed.

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The title salt, 2C19H23FN3O3+·C2O42− {systematic name: bis-[4-(3-carb­oxy-1-cyclo­propyl-6-fluoro-4-oxo-1,4-di­hydro­quino­lin-7-yl)-1-ethyl­piperazin-1-ium] oxalate}, crystallizes with two independent monocations (A and B) and an oxalate dianion (C) in the asymmetric unit. The piperazinium ring in both the cations adopts a slightly disordered chair conformation. The dihedral angles between the mean planes of the cyclo­propyl ring and the 10-membered quinoline ring are 50.6 (5)° (A) and 62.2 (5)° (B). In each of the cations, a single O—H...O intra­molecular hydrogen bond is observed. In the crystal, the oxalate anions inter­act with the cations through N—H...O hydrogen bonds and weak C—H...O inter­actions, forming R22(8) graph-set ring motifs. Weak C—H...F inter­actions along with further C—H...O inter­actions are observed between the cations, forming zigzag chains along [001]. In addition, π–π stacking inter­actions are observed with centroid–centroid distances of 3.5089 (13), 3.5583 (13), 3.7900 (13) and 3.7991 (13) Å.

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The title salts, C8H13N4+·Cl, (I), and C8H13N4+·NO3, (II), contain linked pyridinium–piperazine heterocycles. In the crystal of (I), weak N—H...Cl inter­actions lead to zigzag chains along [100] while in the crystal of (II), bifurcated N—H...(O,O) hydrogen bonds and weak C—H...O inter­actions collectively link the components into infinite chains along [100].

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In the title salt, C23H26F3N2OS+·C4H5O6 [systematic name: 1-(2-hy­droxy­eth­yl)-4-[3-(2-(tri­fluoro­meth­yl)thioxanthen-9-yl­idene)prop­yl]piperazin-1-ium 3-carb­oxy-2,3-di­hydroxy­pro­pion­ate], the monoprotonated piperazine ring in the cation adopts a chair conformation, while the thio­pyran ring of the thioxanthene group has a boat conformation. The dihedral angle between the mean planes of the two outer aromatic rings of the thioxanthene groups is 31.6 (2)°. In the crystal, the cations and anions are linked via O—H...O, N—H...O, O—H...N and C—H...O hydrogen bonds, forming chains propagating along [100]. In addition, R22(7), R22(11), R22(10) and R22(12) graph-set ring motifs involving the anions, and R22(9) graph-set ring motifs involving both the cations and anions are observed. The three F atoms of the tri­fluoro­methyl group are disordered over two sets of sites and the individual atoms were refined with occupancy ratios of 0.54 (6):0.46 (6), 0.72 (2):0.28 (2) and 0.67 (3):0.33 (3).

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In the cation of the title salt [systematic name: 4-(2H-1,3-benzodioxol-5-ylmeth­yl)piperazin-1-ium 2,4,6-tri­nitro­phen­o­late], C12H17N2O2+·C6H2N3O7, the piperazine ring adopts a slightly disordered chair conformation. The piperonyl ring system and the piperazine ring are twisted with respect to each other with an N—C—C—C torsion angle of 40.7 (2)°. In the anion, the dihedral angles between the mean planes of the nitro substituents ortho to the phenolate O atom and the mean plane of the phenyl ring are 28.8 (9) and 32.2 (8)°. In contrast, the nitro group in the para position lies much closer to the aromatic ring plane, subtending a dihedral angle of 3.0 (1)°. In the crystal, the cations and anions inter­act through N—H...O hydrogen bonds and a weak C—H...O inter­action. Weak C—H...O inter­actions are also observed between the anions, forming R22(10) graph-set ring motifs. In addition, a weak centroid–centroid π–π stacking inter­action between the aromatic rings of the cation and the anion, with an inter­centroid distance of 3.7471 (9) Å, contributes to the crystal packing, resulting in a two-dimensional network along (10-1).

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In the cation of the title salt, C3H6N3+·C4H5O4, the protonated pyrazolium ring is planar (r.m.s. deviation = 0.012 Å). An intra­molecular C—H...O hydrogen bond occurs in the anion. In the crystal, N—H...O hydrogen bonds and a weak C—H...O inter­action between the cations and anions form two sets of R22(8) graph-set ring motifs. Inter­molecular O—H...O hydrogen bonds between these lead to a criss-cross pattern along the b axis. In addition to the classical hydrogen bonds, a weak C—H...π(pyrazolium) inter­action is observed and contributes to crystal packing. All of these inter­actions link the mol­ecules into a two-dimensional supra­molecular framework parallel to (10-1).

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In the title hydrated salt [systematic name: 1-(1,3-benzodioxol-5-ylmeth­yl)piperazin-1-ium 4-nitro­benzoate monohydrate], C12H17N2O2+·C7H4NO4·H2O, the piperazinium ring of the cation adopts a slightly distorted chair conformation. The piperonyl and piperazine rings are rotated with respect to each other with an N—C—C—C torsion angle of 45.6 (2)°. In the anion, the nitro group is almost coplanar with the adjacent benzene ring, forming a dihedral angle of only 3.9 (4)°. In the crystal, the cations, anions and water mol­ecules are linked through N—H...O and O—H...O hydrogen bonds into chains along the a axis. In addition, weaker inter­molecular C—H...O inter­actions are also observed within the chains. The anions form centrosymmetric couples through π-stacking inter­actions, with an inter­centroid distance of 3.681 (4) Å between the benzene rings.

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In the title salt {systematic name: 1-[(1,3-benzodioxol-5-yl)meth­yl]piperazin-1-ium 4-chloro­benzoate}, C12H17N2O2+·C7H4ClO2, the piperazine ring adopts a slightly disordered chair conformation. The dioxole ring is in a flattened envelope conformation with the methyl­ene C atom forming the flap. The relative orientation of the piperonyl ring system and the piperazine rings is reflected in the N—C—C[pdbond]C torsion angle of 132.3 (1)°. In the anion, the mean plane of the carboxyl­ate group is twisted from that of the benzene ring by 14.8 (9)°. In the crystal, the components are linked by N—H...O and weak C—H...O hydrogen bonds, forming chains along [010].

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In the title salt, C6H12N3+·C7H3N2O7, the imidazole ring is planar, with a maximum deviation of 0.0013 (14) Å for the N attached to the propanaminium group. In the anion, a single intra­molecular O—H...O hydrogen bond is observed. The mean planes of the nitro groups in the anion are twisted from the benzene ring mean plane making dihedral angles of 24.7 (9) and 3.9 (6)°. In the crystal, the ammonium H atoms form N—H...N and N—H...O hydrogen bonds, resulting in an infinite chain along [111]. In addition to the classical hydrogen bonds, weak C—H...O and π–π [centroid–centroid distance = 3.7124 (9) Å] inter­actions are also observed, which lead to the formation a three-dimensional supramolecular structure that links the chains into layers along the bc plane.

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The title salt, C9H8FN2+·C2F3O2, crystallizes with two independent cations (A and B) and two independent anions (C and D) in the asymmetric unit. In the cations, the dihedral angles between the benzene and pyrazolium rings are 23.7 (3)° in cation A and 1.8 (8)° in cation B. In the crystal, each anion links to the two cations via N—H...O hydrogen bonds, forming a U-shaped unit with an R44(14) ring motif. These U-shaped units stack along the a axis and are linked via C—H...O and C—H...F hydrogen bonds, forming slabs lying parallel to (100). Within the slabs there are π–π inter­actions between the pyrazolium rings [inter-centroid distance = 3.6326 (15) Å] and between the benzene rings [inter-centroid distance = 3.7244 (16) Å]. In the anions, the F atoms of the tri­fluoro­methyl groups are disordered over two sets of sites, with refined occupancy ratios of 0.58 (3):0.42, 0.540 (14):0.46 (14), and 0.55 (2):0.45 (2) for anion C, and 0.73 (5):0.27 (5), 0.63 (5):0.37 (5), and 0.57 (8):0.43 (8) for anion D.

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In the title compound, C15H17N3OS, the dihedral angle between the mean planes of the 2-hy­droxy­napthyl ring system and the hydrazinecarbo­thio­amide group is 73.7 (3)°. In the crystal, weak O—H...S and C—H...O inter­actions and π–π stacking inter­actions involving one of the hy­droxy­napthyl rings with a centroid–centroid distance of 3.6648 (14) Å are observed, forming infinite chains along [010]. In addition, N—H...S inter­actions occur.

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The title compound, C12H17N3OS, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. The dihedral angle between the mean planes of the benzene ring and the hydrazinecarbo­thio­amide group are 6.9 (4) and 37.2 (5)° in mol­ecules A and B, respectively. An intra­molecular O—H...N hydrogen bond is observed in each mol­ecule. This serves to maintain an approximately planar conformation for mol­ecule A, but leaves a significant twist between these two groups in mol­ecule B. In the crystal, a weak N—H...S inter­action is observed, forming inversion dimers among the B mol­ecules and resulting in an R22(8) motif. These dimers are further inter­connected by weak N—H...O and C—H...O inter­molecular inter­actions, forming chains along [011].

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The title co-crystal, 3-(4-fluoro­phen­yl)-1H-pyrazole–5-(4-fluoro­phen­yl)-1H-pyrazole (1/1), C9H7FN2, crystallizes with four independent mol­ecules (A, B, C and D) in the asymmetric unit exhibiting two tautomeric forms (A and D; B and C) due to N—H proton exchange between the two N atoms of the pyrazole ring. The dihedral angles between the mean planes of the pyrazole and benzene rings are 15.6 (1), 19.8 (9), 14.0 (1) and 10.7 (7)° in mol­ecules A, B, C and D, respectively. In the crystal, N—H...N hydrogen bonds link the four mol­ecules in the asymmetric unit into a ring with an R44(12) motif. Furthermore, weak C—H...F inter­actions link the mol­ecules into a three-dimensional network.

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The title compound, C12H18N4O2, crystallizes in the zwitterionic form with protonation at the N atom of the piperazine ring bearing the carboxylate group. The piperazine ring adopts a slightly distorted chair conformation. In the crystal, N—H...O hydrogen bonds are observed, forming chains along [010]. The packing is consolidated by C—H...O inter­actions, which generate a three-dimensional network.

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The title salt {systematic name: bis­[1-(3-chloro­phen­yl)piperazinium 2,4,6-tri­nitro­phenolate]–picric acid (2/1)}, 2C10H14ClN2+·2C6H5N3O7·C6H6N3O7, crystallized with two independent 1-(3-chloro­phen­yl)piperazinium cations, two picrate anions and a picric acid mol­ecule in the asymmetric unit. The six-membered piperazine ring in each cation adopts a slightly distorted chair conformation and contains a protonated N atom. In the picric acid mol­ecule, the mean planes of the nitro groups in the ortho-, meta-, and para-positions are twisted from the benzene ring by 31.5 (3), 7.7 (1), and 3.8 (2)°, respectively. In the anions, the dihedral angles between the benzene ring and the ortho-, meta-, and para-nitro groups are 36.7 (1), 5.0 (6), 4.8 (2)°, and 34.4 (9), 15.3 (8), 4.5 (1)°, respectively. The nitro group in one anion is disordered and was modeled with two sites for one O atom with an occupancy ratio of 0.627 (7):0.373 (7). In the crystal, the picric acid mol­ecule inter­acts with the picrate anion through a trifurcated O—H...O four-centre hydrogen bond involving an intra­molecular O—H...O hydrogen bond and a weak C—H...O inter­action. Weak inter­molecular C—H...O inter­actions are responsible for the formation of cation–anion–cation trimers resulting in a chain along [010]. In addition, weak C—H...Cl and weak π–π inter­actions [centroid–centroid distances of 3.532 (3), 3.756 (4) and 3.705 (3) Å] are observed and contribute to the stability of the crystal packing.
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