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1.  N-[2-({[1-(4-Chloro­phen­yl)-1H-pyrazol-3-yl]­oxy}meth­yl)phen­yl]-N-meth­oxy­hydrazinecarboxamide 
In the title compound, C18H18ClN5O3, the hydrazinecarboxamide N—N—C(O)—N unit is nearly planar [maximum deviation = 0.074 (2) Å] and is inclined at a dihedral angle of 57.43 (7)° with respect to the plane of the attached benzene ring. The chloro­phenyl group makes dihedral angles of 19.71 (7) and 34.07 (6)° with the pyrazole and benzene rings, respectively. In the crystal, pairs of N—H⋯O hydrogen bonds link the mol­ecules into inversion dimers that are further linked into chains along the a-axis direction by N—H⋯N hydrogen bonds. In addition, π–π stacking inter­actions are observed between benzene rings [centroid–centroid distance = 3.680 (1) Å].
doi:10.1107/S1600536812038214
PMCID: PMC3470263  PMID: 23125707
2.  {2-[(1,3-Benzo­thia­zol-2-yl)meth­oxy]-5-fluoro­phen­yl}(4-chloro­phen­yl)methanone 
The asymmetric unit of the title compound, C21H13ClFNO2S, contains two independent mol­ecules with similar conformations. In the mol­ecules, the thia­zole ring is essentially planar [maximum atomic deviations = 0.014 (4) and 0.023 (5) Å] and is oriented with respect to the fluoro­phenyl ring and chloro­phenyl rings at 9.96 (18) and 70.39 (18)° in one mol­ecule and at 7.50 (18) and 68.43 (18)° in the other; the dihedral angles between the fluoro­phenyl and chloro­phenyl rings are 64.9 (2) and 64.6 (2)°, respectively. Inter­molecular C—H⋯O and C—H⋯F hydrogen bonds stabilize the three-dimensional supra­molecular architecture. Weak C—H⋯π and π–π inter­actions [centroid–centroid distance = 3.877 (3) Å] lead to a criss-cross mol­ecular packing along the c axis.
doi:10.1107/S1600536813014621
PMCID: PMC3772451  PMID: 24046594
3.  1-{2-(4-Chloro­benz­yloxy)-2-[4-(mor­pho­lin-4-yl)phen­yl]eth­yl}-1H-benzimidazole propan-2-ol monosolvate 
In the title compound, C26H26ClN3O2·C3H7OH, the benzimid­azole ring system is essentially planar [maximum deviation = −0.018 (2) Å] and its mean plane is oriented with respect to the two benzene rings at dihedral angles of 4.51 (6) and 56.16 (6)°, and the dihedral angle between the two benzene rings is 59.11 (7)°. The morpholine ring displays a chair conformation. The propan-2-ol solvent mol­ecule links with the benzimidazole ring via an O—H⋯N hydrogen bond. In the crystal, weak inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into inversion dimers with an R 2 2(28) motif. π–π stacking occurs between the parallel chloro­benzene rings [centroid–centroid distance = 3.792 (1) Å]. Weak C—H⋯π inter­actions and short Cl⋯Cl [3.2037 (10) Å] contacts are also observed.
doi:10.1107/S1600536813022599
PMCID: PMC3884486  PMID: 24427066
4.  2-[6-(4-Chloro­phen­yl)imidazo[2,1-b][1,3]thia­zol-2-yl]-N′-[(E)-4-meth­oxy­benzyl­idene]acetohydrazide 
In the imidazo[2,1-b][1,3]thia­zole group of the title compound, C21H17ClN4O2S, the dihedral angle between the thia­zole and imidazole rings is 1.9 (2)°. The mean plane of this group makes dihedral angles of 5.5 (2) and 39.9 (2)° with the benzene rings of the chloro­phenyl and meth­oxy­phenyl groups, respectively. The dihedral angle between these two benzene rings is 34.4 (2)°. In the crystal, mol­ecules are connected to each other by inter­molecular N—H⋯O hydrogen bonds along the b axis, generating a C(4) chain. Weak C—H⋯π inter­actions also occur.
doi:10.1107/S1600536810052359
PMCID: PMC3050215  PMID: 21522689
5.  7-(4-Chloro­phen­yl)-9-phenyl-7H-pyrrolo[3,2-e]tetra­zolo[1,5-c]pyrimidine 
In the title compound, C18H11ClN6, the pyrrole, pyrimidine and tetra­zole rings form a nearly planar fused trihetrocyclic system with an r.m.s. deviation of 0.0387 (13) Å, to which the 4-chloro­phenyl group and the phenyl group are substituted at the 7 and 9 positions, respectively. The dihedral angles between the pyrrole ring and the 4-chloro­phenyl and phenyl rings are 32.1 (4) and 7.87 (7)°, respectively. In the crystal, weak inter­molecular C—H⋯N and C—H⋯Cl hydrogen bonds link the mol­ecules into a layer parallel to the (001) plane. The layers are further connected by π–π stacking inter­actions [centroid–centroid distances: 3.8413 (8) and 3.5352 (8) Å]. Intra­molecular C—H⋯N hydrogen bonds are also present.
doi:10.1107/S160053681000485X
PMCID: PMC2983688  PMID: 21580361
6.  (E)-3-(2-Chloro­phen­yl)-1-(4-nitro­phen­yl)prop-2-en-1-one 
In the title compound, C15H10ClNO3, a substituted chalcone, the 2-chloro­phenyl and 4-nitro­phenyl rings make a dihedral angle of 26.48 (6)°. The nitro group makes a dihedral angle of 11.64 (7)° with the plane of the benzene ring to which it is bound. Weak intra­molecular C—H⋯O and C—H⋯Cl inter­actions involving the enone groups generate S(5) ring motifs, which help to stabilize the planarity of the 3-(2-chloro­phen­yl)prop-2-en-1-one segment of the mol­ecule. In the crystal structure, adjacent mol­ecules are stacked in a head-to-tail fashion into columns along the a axis by π–π inter­actions [centroid–centroid distance = 3.6955 (8) Å]. Neighbouring columns are linked by weak C—H⋯O inter­actions.
doi:10.1107/S160053680801218X
PMCID: PMC2961413  PMID: 21202689
7.  2-[2-(2-Chloro­phen­yl)-2-oxoeth­yl]-2,3-dihydro-1λ6,2-benzothia­zole-1,1,3-trione 
The asymmetric unit of the title compound, C15H10ClNO4S, contains two independent conformers wherein the 2-chloro­phenyl group in one is rotated by approximately 180° compared to the other mol­ecule. This affects the S—N—C—C(=O) and N—C—C(=O)—C torsion angles giving vlaues of −87.0 (2) and 158.7 (2)° in one mol­ecule and −104.3 (2) and −173.4 (2)° in the other. The benzisothia­zole ring systems in the two mol­ecules are essentially planar (r.m.s. deviations = 0.017 and 0.010 Å) and form dihedral angles of 73.53 (7) and 73.26 (6)° with the benzene rings. In the crystal, there are weak π–π inter­actions between the benzene rings of the benzisothia­zole groups and symmetry-related chloro­benzene rings with centroid–centroid distances of 3.6178 (13) and 3.6267 (15) Å. In addition, pairs of weak inter­molecular C—H⋯O hydrogen bonds form inversion dimers which are connected by further C—H⋯O hydrogen bonds into a three-dimensional network.
doi:10.1107/S1600536812036653
PMCID: PMC3435829  PMID: 22969675
8.  4-{[(E)-(4-Chloro­phen­yl)methyl­idene]amino}-3-{2-[4-(2-methyl­prop­yl)phen­yl]eth­yl}-1H-1,2,4-triazole-5(4H)-thione 
The asymmetric unit of the title compound, C21H23ClN4S, contains nine crystallographically independent mol­ecules, labelled A to I. The orientation of the 2-[4-(2-methyl­prop­yl)phen­yl]ethyl unit with respect to the rest of the mol­ecule is significantly different in mol­ecules E, F, H and I compared to the other independent mol­ecules. The isobutyl group of mol­ecule B is disordered over two orientations, with occupancies of 0.764 (7) and 0.236 (7). The benzene rings of the chloro­phenyl and methyl­propyl­phenyl units form dihedral angles of 21.90 (11) and 71.47 (11)°, respectively, with the triazole ring in mol­ecule A [9.15 (11) and 80.37 (11)° in B, 7.14 (11) and 84.06 (11)° in C, 25.76 (11) and 76.59 (11)° in D, 13.68 (11) and 76.82 (10)° in E, 8.38 (11) and 69.77 (10)° in F, 30.34 (11) and 78.12 (11)° in G, 21.20 (11) and 71.58 (10)° in H, and 27.65 (11) and 65.23 (11)° in I]. In each independent mol­ecule, a C—H⋯S hydrogen bond is observed. The crystal packing is stabilized by N—H⋯S and C—H⋯S hydrogen bonds, and by C—H⋯π inter­actions involving the methyl­propyl­phenyl ring.
doi:10.1107/S160053680901650X
PMCID: PMC2969595  PMID: 21583109
9.  Crystal structure of N-[3-(2-chloro­benzo­yl)-5-ethyl­thio­phen-2-yl]-2-[(E)-(2-hy­droxy­benzyl­idene)amino]­acetamide 
In the title compound, C22H19ClN2O3S, the dihedral angle between the mean planes of the thio­phene ring and the chloro­phenyl and hy­droxy­phenyl rings are 70.1 (1) and 40.2 (4)°, respectively. The benzene rings are twisted with respect to each other by 88.9 (3)°. The imine bond lies in an E conformation. Intra­molecular O—H⋯N and N—H⋯O hydrogen bonds each generate S(6) ring motifs. In the crystal, weak C—H⋯O inter­actions link the mol­ecules, forming chains along the c axis and zigzag chains along the b axis, generating sheets lying parallel to (100).
doi:10.1107/S1600536814018224
PMCID: PMC4186110  PMID: 25309197
crystal structure; thio­phene derivatives; Schiff bases; hydrogen bonding
10.  Ethyl 1-sec-butyl-2-(4-chloro­phen­yl)-1H-benzimidazole-5-carboxyl­ate 
In the title compound, C20H21ClN2O2, the ethyl 1H-benzimidazole-5-carboxyl­ate ring system, excluding the methyl­ene and methyl H atoms, is almost planar, with a maximum deviation of 0.055 (1) Å, and makes a dihedral angle of 40.63 (4)° with the benzene ring. The sec-butyl group is disordered over two positions, with refined site occupancies of 0.855 (4) and 0.145 (4). In the crystal, mol­ecules are linked into chains along [010] via inter­molecular C—H⋯O hydrogen bonds and are further inter­connected by C—H⋯Cl inter­actions into two-dimensional networks parallel to (001). The crystal structure is further consolidated by C—H⋯π inter­actions.
doi:10.1107/S1600536810033945
PMCID: PMC3008004  PMID: 21588740
11.  (E)-2-[1-(1-Benzothio­phen-2-yl)ethyl­idene]-N-phenyl­hydrazinecarboxamide 
The title compound, C17H15N3OS, crystallizes with two unique mol­ecules, denoted 1 and 2, in the asymmetric unit. The two mol­ecules are closely similar and overlay with an r.m.s. deviation of 0.053 Å. Both mol­ecules adopt E configurations with respect to the C=N bonds. The dihedral angles between the benzothio­phene groups and N-bound phenyl rings are 36.36 (9)° for mol­ecule 1 and 29.71 (9)° for mol­ecule 2. The C=N—NH—C(O)NH ethyl­idene–hydrazinecarboxamide units are also reasonably planar, with r.m.s. deviations of 0.061 and 0.056 Å, respectively, for the two mol­ecules. The methyl substituents lie 0.338 (3) and 0.396 (3) Å, respectively, from these planes. The C=N—NH—C(O)NH planes are inclined to the phenyl rings at 13.65 (11) and 15.56 (11)°, respectively, in mol­ecules 1 and 2. This conformation is enhanced by weak intra­molecular C—H⋯O hydrogen bonds between ortho-H atoms of the two phenyl rings and the carbonyl O atoms, which generate S(6) rings in each mol­ecule. In the crystal, pairs of mol­ecules are linked by pairs of inter­molecular N—H⋯O hydrogen bonds into dimers. Alternating dimers are further inter­connected by weak C—H⋯O contacts into zigzag rows along b. The rows are stacked along a by C—H⋯π contacts involving the benzene ring from molecule 2 and the thiophene ring from molecule 1 of adjacent benzothio­phene units.
doi:10.1107/S1600536811037457
PMCID: PMC3201294  PMID: 22058789
12.  6-(2-Chloro­benz­yl)-1-(4-chloro­phen­yl)-7-hy­droxy-2,3-dihydro-1H-imidazo[1,2-a]pyrimidin-5-one 
The title compound, C19H15Cl2N3O2, was obtained by a one-step cyclo­condensation of 2-amino-1-(4-chloro­phen­yl)imidazoline with diethyl (2-chloro­benz­yl)malonate under basic conditions. In the crystalline state, the mol­ecule exists as the 7-hy­droxy-5-oxo tautomer. The dihedral angles between the fused imidazopyrimidine and aromatic chloro­phenyl and chloro­benzyl rings are 14.2 (1) and 70.7 (1)°, respectively. The conformation of the mol­ecule is influenced by the intra­molecular C—H⋯O and C—H⋯N hydrogen bonds, giving a nearly planar five-ring fused system [maximum deviation from the mean plane = 0.296 (2) Å]. In the crystal structure, strong inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into chains along the c axis. These chains are further stabilized by weak C—H⋯Cl and π–π inter­actions [centroid–centroid distance = 3.6707 (12) Å].
doi:10.1107/S160053681003919X
PMCID: PMC3009369  PMID: 21588948
13.  (2E)-1-(5-Chloro­thio­phen-2-yl)-3-(2,3-dimeth­oxy­phen­yl)prop-2-en-1-one 
In the title compound, C15H13ClO3S, the chloro­thio­phene and dimeth­oxy­phenyl groups are linked by a prop-2-en-1-one group. The C=C double bond exhibits an E conformation. The mol­ecule is non-planar, with a dihedral angle of 31.12 (5)° between the chloro­thio­phene and dimeth­oxy­phenyl rings. The meth­oxy group at position 3 is coplanar with the benzene ring to which it is attached, with a C—O—C—C torsion angle of −3.8 (3)°. The meth­oxy group attached at position 2 of the benzene ring is in a (+)synclinal conformation, as indicated by the C—O—C—C torsion angle of −73.6 (2)°. In the crystal, two different C—H⋯O inter­molecular inter­actions generate chains of mol­ecules extending along the b axis.
doi:10.1107/S1600536811037135
PMCID: PMC3201439  PMID: 22058781
14.  1-(4-Methyl­benz­yl)-2-(4-methyl­phen­yl)-1H-benzimidazole 
The title compound, C22H20N2, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. The benzimidazole units are almost planar [maximum deviations = 0.0161 (8) Å for A and 0.0276 (8) Å for B]. The dihedral angles between the benzimidazole unit and the benzene rings of the 4-methyl­benzyl and 4-methyl­phenyl groups are 76.64 (3) and 46.87 (4)°, respectively, in mol­ecule A. The corresponding values in mol­ecule B are 86.31 (2) and 39.14 (4)°. The dihedral angles between the planes of the two benzene rings are 73.73 (3) and 80.69 (4)° in mol­ecules A and B, respectively. Pairs of weak inter­molecular C—H⋯N hydrogen bonds link B mol­ecules, forming centrosymmetric dimers with R 2 2(8) ring motifs. There are no significant corresponding inter­actions involving the A mol­ecules.
doi:10.1107/S160053681105077X
PMCID: PMC3239139  PMID: 22199987
15.  (E)-1-(4-Amino­phen­yl)-3-(2-chloro­phen­yl)prop-2-en-1-one 
The title compound, C15H12ClNO, a substituted chalcone, adopts an E configuration with respect to the C=C bond of the enone unit. The mol­ecule is not planar, as can be seen from the dihedral angle of 28.9 (2)° between the two rings which are twisted from each other. The enone segment of the mol­ecule is not coplanar with the chloro­phenyl ring, making a dihedral angle of 23.4 (3)° with it. The amino group is also not coplanar with the ring to which it is bound, making a dihedral angle of 35 (4)°. In the crystal structure, adjacent mol­ecules are linked by N—H⋯O inter­actions into one-dimensional infinite chains along the c axis, and are further stacked as one-dimensional zigzag chains down the b axis, forming two-dimensional extended networks parallel to the bc plane.
doi:10.1107/S1600536808030456
PMCID: PMC2959457  PMID: 21201210
16.  (2E)-1-(3-Chloro­phen­yl)-3-(4-chloro­phen­yl)prop-2-en-1-one 
The title compound, C15H10Cl2O, is a chalcone with 3-chloro­phenyl and 4-chloro­phenyl substituents bonded at the opposite ends of a propenone group, the biologically active region. The dihedral angle between mean planes of these two chloro-substituted benzene rings is 46.7 (7)° compared to 46.0 (1) and 32.4 (1)° in similar published sructures. The angles between the mean plane of the prop-2-en-1-one group and the mean planes of the 3-chloro­phenyl and 4-chloro­phenyl rings are 24.1 (2) and 29.63°, respectively. While no classical hydrogen bonds are present, weak inter­molecular C—H⋯π-ring inter­actions are observed, which contribute to the stability of crystal packing.
doi:10.1107/S1600536809037805
PMCID: PMC2971255  PMID: 21578256
17.  2-(1H-1,3-Benzodiazol-2-ylsulfan­yl)-1-(4-chloro­phen­yl)ethanone 
The mol­ecule in the structure of the title compound, C15H11ClN2OS, displays two planar residues [r.m.s. deviation = 0.014 Å for the benzimidazole residue, and the ketone group is co-planar with the benzene ring to which it is attached forming a O—C—C—C torsion angle of −173.18 (14) °] linked at the S atom. The overall shape is based on a twisted V, the dihedral angle formed between the two planes being 82.4 (2) °. The amine-H atom is bifurcated, forming N—H⋯O and N—H⋯S hydrogen bonds leading to dimeric aggregates. These are linked into a supra­molecular chain along the c axis via C—H⋯π hydrogen bonds. Chains form layers in the ab plane being connected along the c axis via weak π–π inter­actions [3.9578 (8) Å] formed between centrosymmetrically related chloro-substituted benzene rings.
doi:10.1107/S160053681103666X
PMCID: PMC3201531  PMID: 22064924
18.  Crystal structure of (Z)-3-{3-(4-chloro­phen­yl)-2-[(4-chloro­phen­yl)imino]-2,3-di­hydro­thia­zol-4-yl}-2H-chromen-2-one 
In the title compound, C24H14Cl2N2O2S, the 2H-chromene ring system is approximately planar, with a maximum deviation of 0.025 (2) Å. The thia­zole ring is almost planar, with an r.m.s. deviation of 0.0022 Å, and makes a dihedral angle of 58.52 (7)° with the chromene ring system. The chromene ring system is inclined at angles of 58.3 (1) and 55.39 (9)° with respect to the two chloro­phenyl rings. The two chloro­phenyl rings show significant deviation from coplanarity, with a dihedral angle between them of 47.69 (8)°. The crystal structure features C—H⋯Cl inter­actions extending in (100) and propagating along the a-axis direction and weak π–π inter­actions [centroid–centroid separation = 3.867 (2) Å].
doi:10.1107/S1600536814024775
PMCID: PMC4257461  PMID: 25553038
crystal structure; 2H-chromen-2-one; bioactivity; hydrogen bonding; π–π inter­actions
19.  1,3-Bis(3-phenyl­prop­yl)-1H-benzimidazol-3-ium-2-carbodithio­ate 
The title compound, C26H26N2S2, was synthesized from bis­[1,3-bis­(3-phenyl­prop­yl)benzimidazolidine-2-yl­idene] and CS2 in toluene. The mol­ecular structure is composed of a benzimidazole ring system with two phenyl­propyl substituents and a dithio­carboxyl­ate group in the 2-position. The benzimidazole unit is essentially planar, with a maximum atomic deviation of 0.008 (2) Å, and makes dihedral angles of 72.72 (10) and 27.62 (12)°, with the two phenyl rings. The dihedral angle between the two phenyl rings is 55.98 (15)°. The mol­ecular packing is stabilized by a C—H⋯S inter­molecular hydrogen-bonding inter­action and a C—H⋯π inter­action between a benzene H atom and the phenyl ring of a neighbouring mol­ecule.
doi:10.1107/S1600536808042761
PMCID: PMC2968085  PMID: 21581631
20.  2-Amino-4-(4-chloro­phen­yl)-5,6-dihydro­benzo[h]quinoline-3-carbonitrile–3-amino-1-(4-chloro­phen­yl)-9,10-dihydro­phenanthrene-2,4-dicarbonitrile (1/4) 
The asymmetric unit of the 1:4 title co-crystal of 2-amino-4-(4-chloro­phen­yl)-5,6-dihydro­benzo[h]quinoline-3-carbonitrile and 3-amino-1-(4-chloro­phen­yl)-9,10-dihydro­phenanthrene-2,4-dicarbonitrile, 0.2C20H14ClN3·0.8C22H14ClN3, has the atoms of the fused-ring system and those of the amino, cyano and chloro­phenyl substitutents overlapped. The fused-ring system is buckled owing to the ethyl­ene linkage in the central ring. There are two independent overlapped mol­ecules in the asymmetric unit. In one independent mol­ecule, the two flanking aromatic rings are twisted by 24.4 (1)° and the ring of the chloro­phenyl substituent is twisted by 87.3 (1)° relative to the amino- and cyano-bearing aromatic ring. In the second mol­ecule, the respective dihedral angles are 26.1 (1) and 57.8 (1)°. The two independent mol­ecules are linked by N—H⋯N hydrogen bonds into dimers.
doi:10.1107/S1600536811040529
PMCID: PMC3247609  PMID: 22219914
21.  1,3-Dibenzyl-2-(2-chloro­phen­yl)-4-methyl­imidazolidine 
In the title compound, C24H25ClN2, the methine, methyl­ene and methyl C atoms of the methyl-substituted imidazolidine ring are disordered over two sets of sites with a refined occupancy ratio of 0.834 (4):0.166 (4). Each disordered ring assumes an envelope conformation with an N atom as the flap. The pendant benzyl rings are oriented equatorially with respect to the imidazolidine ring. The chloro­phenyl ring is inclined to the mean plane of the four planar atoms of the major component of the imidazolidine ring by 76.27 (12)°. The dihedral angles between the chloro­phenyl ring and the two benzyl rings are 55.31 (9) and 57.50 (8)°; the dihedral angle between these latter rings is 71.59 (9)°. In the crystal, mol­ecules are linked by C—H⋯Cl inter­actions and a number of weak C—H⋯π inter­actions, involving all three aromatic rings, forming a three-dimensional structure.
doi:10.1107/S1600536812047575
PMCID: PMC3589010  PMID: 23476246
22.  2-Amino-4-(2-chloro­phen­yl)-7,7-di­methyl-5-oxo-5,6,7,8-tetra­hydro-4H-chromene-3-carbonitrile hemihydrate 
The asymmetric unit of the title compound, C18H17ClN2O2·0.5H2O, contains two organic mol­ecules and one solvent water mol­ecule. In each organic mol­ecule, the cyclo­hexene ring adopts an envelope conformation with the C atom connecting the two methyl groups on the flap; the 4H-pyran ring is nearly planar [maximum deviation = 0.113 (3) Å in one mol­ecule and 0.089 (3) Å in the other mol­ecule] and is approximately perpendicular to the chloro­phenyl ring [dihedral angle = 86.43 (15)° in one mol­ecule and 89.73 (15)° in the other mol­ecule]. Inter­molecular N—H⋯N, N—H⋯O, O—H⋯O and O—H⋯Cl hydrogen bonding is present in the crystal.
doi:10.1107/S1600536812003807
PMCID: PMC3297884  PMID: 22412687
23.  7-(4-Methoxy­phen­yl)-5-methyl-9-phenyl-7H-pyrrolo[2′,3′:4,5]pyrimido[1,6-d]tetrazole 
The title compound, C20H16N6O, is composed of a tetra­zolo ring and a 4-methoxy­phenyl and a benzene-substituted pyrrole ring at the 7 and 9 positions fused to a pyrimidine ring in a nearly planar fashion [maximum deviation of 0.018 (1) Å for the fused ring system]. A methyl group at the 5 position is also in the plane of the hetero cyclic system. The dihedral angle between the mean planes of the benzene and 4-methoxy­phenyl rings is 40.4 (2)°. The dihedral angles between the mean planes of the pyrimidine and the benzene and 4-methoxy­phenyl rings are 15.6 (5)° and 52.6 (7)°, respectively. A weak intra­molecular C—H⋯N hydrogen bond inter­action, which forms an S(7) graph-set motif, helps to establish the relative conformations of the tetrazolo and benzene rings. In the crystal, weak inter­molecular C—H⋯O, C—H⋯π and π–π stacking inter­actions [centroid–centroid distances = 3.5270 (16), 3.5113 (16), 3.7275 (17) and 3.7866 (17) Å] link the mol­ecules into a two-dimensional array obliquely parallel to (101) and propagating along the b axis.
doi:10.1107/S1600536809053653
PMCID: PMC2980237  PMID: 21580097
24.  (4-Chloro­phen­yl)[1-(4-methoxy­phen­yl)-3-(5-nitro-2-fur­yl)-1H-pyrazol-4-yl]methanone 
In the title compound, C21H14ClN3O5, an intra­molecular C—H⋯O hydrogen bond generates an S(7) ring motif and the furan and pyrazole rings are almost coplanar, making a dihedral angle of 1.98 (5)°. The pyrazole ring is inclined at dihedral angles of 47.59 (4) and 7.27 (4)° to the chloro­phenyl and methoxy­phenyl groups, respectively. The nitro group is almost coplanar to its attached furan ring [dihedral angle = 2.03 (12)°]. In the crystal, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. The crystal structure also features short inter­molecular O⋯N [2.8546 (12) Å] and Cl⋯O [3.0844 (9) Å] contacts as well as aromatic π–π stacking inter­actions [centroid–centroid distance = 3.4367 (6) Å].
doi:10.1107/S1600536810011931
PMCID: PMC2979246  PMID: 21579120
25.  (1E,4E)-1,5-Bis(2,4,6-trimeth­oxy­phen­yl)penta-1,4-dien-3-one 
There are two crystallographically independent mol­ecules in the asymmetric unit of the title bis­chalcone derivative, C23H26O7. The mol­ecules are unsymmetrical and almost planar: the dihedral angle between two benzene rings is 1.04 (7)° in one mol­ecule and 2.31 (7)° in the other. The central penta-1,4-dien-3-one fragment makes dihedral angles of 7.61 (7) and 6.82 (7)° with the two adjacent benzene rings in one mol­ecule, while the corresponding values are 7.85 (7) and 9.42 (6)° in the other. In both mol­ecules, the three meth­oxy groups of the two 2,4,6-trimeth­oxy­phenyl units are coplanar with the attached benzene rings [C—O—C—C- torsion angles of −1.5 (2), −7.2 (2) and 4.1 (2)° in one mol­ecule and −0.7 (2), −5.5 (2) and −0.6 (2)° in the other]. The mol­ecular conformations are stabilized by weak intra­molecular C—H⋯O inter­actions generating two S(6) ring motifs. In the crystal, mol­ecules are linked by weak inter­molecular C—H⋯O inter­actions into zigzag chains parallel to the c axis. The crystal structure is further stabilized by C—H⋯π inter­actions and π–π inter­actions with centroid–centroid distances of 3.6433 (8) Å.
doi:10.1107/S1600536810049299
PMCID: PMC3050352  PMID: 21522745

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