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1.  3,3-Dimethyl-cis-9a,13a-diphenyl-2,3,9a,11,12,13a-hexa­hydro-1H-benzo[h][1,4]dioxino[2′,3′:5,6][1,4]dioxino[2,3-f]chromene 
In the title di­hydro­dioxin, C31H28O5, the dioxane ring has a chair conformation, whereas each of the pyran and dioxine rings has an envelope conformation with methyl­ene and quaternary C atoms, respectively, being the flap atoms. The phenyl rings are cis and form a dihedral angle of 82.11 (10)°. The molecular structure is stabilized by C—H⋯O contacts. In the crystal packing, supra­molecular layers parallel to (101) are sustained by C—H⋯π inter­actions.
PMCID: PMC3884479  PMID: 24427106
2.  (2E)-N′-[(E)-2-Hy­droxy­benzyl­idene]-3-phenyl­prop-2-enohydrazide 
In the non-planar title compound, C16H14N2O2, the dihedral angle between the phenyl rings is 16.67 (8)°. An E conformation is found for each of the imine [1.286 (2) Å] and ethyl­ene [1.335 (2) Å] bonds. The amide O and H atoms are anti, and an intra­molecular hy­droxy O—H⋯N hydrogen bond is noted. The formation of N—H⋯O(hy­droxy) hydrogen bonds in the crystal packing leads to helical chains along the b axis. Supra­molecular layers in the ab plane are formed as the chains are linked by C—H⋯O inter­actions.
PMCID: PMC3394040  PMID: 22798905
3.  (2E)-N′-[(E)-Benzyl­idene]-3-phenyl­prop-2-enohydrazide from synchrotron radiation 
In the title compound, C16H14N2O, the dihedral angle between the phenyl rings is 25.48 (12)°. An E conformation is found for each of the imine [1.269 (3) Å] and ethyl­ene [1.313 (3) Å] bonds. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, leading to zigzag chains along [010]. Supra­molecular layers in the ab plane are formed, whereby the chains are linked by C—H⋯N and C—H⋯π inter­actions.
PMCID: PMC3394041  PMID: 22798906
4.  4-(3-Fluoro­anilino)thieno[2,3-b]pyridine-6-carb­oxy­lic acid 
In the title compound, C14H9FN2O2S, the thieno[2,3-b]pyridine residue is almost planar (r.m.s. deviation = 0.0194 Å), with the carb­oxy­lic acid group [dihedral angle = 11.9 (3)°] and the benzene ring [71.1 (4)°] being twisted out of this plane to different extents. An intra­molecular N—H⋯O(carbon­yl) hydrogen bond closes an S(6) ring. Supra­molecular chains along [01-1] mediated by O—H⋯N(pyridine) hydrogen bonds feature in the crystal. A three-dimensional architecture is completed by π–π inter­actions occurring between the benzene ring and the two rings of the thieno[2,3-b]pyridine residue [centroid–centroid distances = 3.6963 (13) and 3.3812 (13) Å]. The F atom is disordered over the two meta sites in a near statistical ratio [0.545 (5):0.455 (5)].
PMCID: PMC3394012  PMID: 22798877
5.  N-(4-Chloro­phen­yl)-5-(4,5-dihydro-1H-imidazol-2-yl)thieno[2,3-b]pyridin-4-amine 
In the title compound, C16H13ClN4S, the thienopyridine fused-ring system is nearly planar (r.m.s. deviation = 0.0333 Å) and forms a dihedral angle of 4.4 (3)° with the attached dihydro­imidazole ring (r.m.s. deviation = 0.0429 Å) allowing for the formation of an intra­molecular (exocyclic amine)N—H⋯N(imine) hydrogen bond. The benzene rings of the disordered (50:50) –N(H)—C6H4Cl residue form dihedral angles of 59.1 (3) and 50.59 (15)° with the fused ring system. In the crystal, (imidazole amine)N—H⋯N(pyridine) hydrogen bonds lead to a supra­molecular helical chain along the b axis. The chains assemble into layers (ab plane) with inter-digitation of the chloro­benzene rings which results in weak C—H⋯Cl inter­actions in the c-axis direction.
PMCID: PMC3393946  PMID: 22798811
6.  4-[(E)-2-(2-Chloro­benzyl­idene)hydrazin-1-yl]quinolin-1-ium chloride dihydrate 
In the title hydrated salt, C16H13ClN3 +·Cl−·2H2O, a small twist is evident in the cation so that the chloro­benzene ring is not coplanar with the central hydrazinyl group [the N—C—C—C torsion angle = −4.8 (12)°]. The conformation about the imine N=C bond [1.284 (10) Å] is E. The components of the structure are connected into a three-dimensional architecture via O—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen bonds. One water H atom is disposed over two sites of equal occupancy.
PMCID: PMC3379418  PMID: 22719616
7.  4-[(E)-2-(2,4-Dichloro­benzyl­idene)hydrazin-1-yl]quinolin-1-ium chloride monohydrate 
In the title hydrated salt, C16H12Cl2N3 +·Cl−·H2O, there is a small twist in the cation as seen in the torsion angle linking the benzene ring to the rest of the mol­ecule [171.96 (17)°]. In the crystal, the quinolinium H atom forms a hydrogen bond to the lattice water mol­ecule, which also forms hydrogen bonds to two Cl− anions. Each Cl− ion also accepts a hydrogen bond from the hydrazine H atom. The three-dimensional architecture is also stabilized by π–π inter­actions between centrosymmetrically related quinoline residues [centroid–centroid distance = 3.5574 (11) Å].
PMCID: PMC3344163  PMID: 22606166
8.  7-Chloro-4-[(E)-2-(2,5-dimeth­oxy­benzyl­idene)hydrazin-1-yl]quinoline 
In the nearly planar title compound (r.m.s. deviation for the 24 non-H atoms = 0.064 Å), C18H16ClN3O2, the conformation about the N=C bond is E. Supra­molecular chains propagated by glide symmetry along [001] are found in the crystal packing. These are sustained by N—H⋯N hydrogen bonds with the quinoline N atom being the acceptor. The chains are connected into a three-dimensional architecture by π–π inter­actions involving all three aromatic rings [centroid–centroid distances = 3.5650 (9)–3.6264 (9) Å].
PMCID: PMC3344174  PMID: 22606177
9.  7-Chloro-4-[(E)-2-(3,4,5-trimeth­oxy­benzyl­idene)hydrazin-1-yl]quinoline 
In the title compound, C19H18ClN3O3, the r.m.s. deviation through the 23 non-H and non-meth­oxy atoms is 0.088 Å, indicating a planar mol­ecule with the exception of the meth­oxy groups. One meth­oxy group, surrounded on either side by the other meth­oxy groups, is almost normal to the benzene ring to which it is connected [C—O—Car—Car torsion angle = 81.64 (15)°]. In the crystal, N—H⋯O, C—H⋯O and π–π inter­actions [between quinoline residues; centroid–centroid distance = 3.4375 (8) Å] link mol­ecules into a three-dimensional architecture.
PMCID: PMC3344149  PMID: 22606152
10.  (2S,3R)-tert-Butyl N-[4-(N-benzyl-4-fluoro­benzene­sulfonamido)-3-hy­droxy-1-phenyl­butan-2-yl]carbamate 
In the title mol­ecule, C28H33FN2O5S, the mean plane about the tertiary amine group (sum of the angles subtended at the sp 2-hybridized N atom = 359.7°) forms a dihedral angle of 16.66 (6)° with the phenyl ring adjacent to the carbamate group. The sulfonamide benzene ring and the hy­droxy group lie to either side of the C2NS plane, whereas the benzyl­phenyl (connected to the N atom) and carbamate substituents lie to the other side. Supra­molecular layers propagating in the ac plane are found in the crystal, linked by hy­droxy–sulfonamide O—H⋯O and carbamate–carbamate N—H⋯O hydrogen bonds along with C—H⋯O and C—H⋯π inter­actions.
PMCID: PMC3344084  PMID: 22606087
11.  1-(4-Methyl­phen­yl)-3-phenyl-1H-pyrazol-5-yl 4-nitro­benzene­sulfonate 
In the title mol­ecule, C22H17N3O5S, the pyrazole ring is planar (r.m.s. deviation = 0.018 Å) and forms dihedral angles of 21.45 (10) and 6.96 (10)° with the N- and C-bound benzene rings, respectively. Supra­molecular layers in the bc plane are formed in the crystal via C—H⋯O and π–π inter­actions involving the sulfonamide benzene ring inter­acting with the N- and C-bound benzene rings [centroid–centroid distances = 3.790 (2) and 3.730 (2) Å, respectively]. The crystal studied was found to be a merohedral twin (twin law 1 0 0.678, 0 -1 0, 0 0 -1), the fractional contribution of the minor component being approximately 36%.
PMCID: PMC3344041  PMID: 22589950
12.  4-[3,4-Dimethyl-1-(4-methyl­phen­yl)-5-oxo-4,5-dihydro-1H-pyrazol-4-yl]-3,4-dimethyl-1-(4-methyl­phen­yl)-4,5-dihydro-1H-pyrazol-5-one 
In the title compound, C24H26N4O2, the complete mol­ecule is generated by the application of twofold symmetry. The pyrazole ring is approximately planar [r.m.s. deviation = 0.026 Å] and the benzene ring is twisted out of this plane [dihedral angle = 21.94 (7)°]. A twist in the mol­ecule about the central C—C bond [1.566 (3) Å] is also evident [C—C—C—C torsion angle = 44.30 (14)°]. Supra­molecular layers in the bc plane are formed in the crystal packing via C—H⋯O and C—H⋯π inter­actions.
PMCID: PMC3343962  PMID: 22590043
13.  1,3-Diphenyl-4,5-dihydro-1H-pyrazol-5-one 
In the title pyrazolone derivative, C15H12N2O, the five-membered ring is approximately planar (r.m.s. deviation = 0.018 Å), and the N- and C-bound benzene rings are inclined to this plane [dihedral angles = 21.45 (10) and 6.96 (10)°, respectively] and form a dihedral angle of 20.42 (10)° with each other. Supra­molecular layers are formed in the crystal structure via C—H⋯O and C—H⋯N inter­actions, and these are assembled into double layers by C—H⋯π and π–π inter­actions between the pyrazole and C-bound benzene rings [ring centroid–centroid distance = 3.6476 (12) Å]. The double layers stack along the a axis being connected by π–π inter­actions between the N- and C-bound benzene rings [ring centroid–centroid distance = 3.7718 (12) Å].
PMCID: PMC3343981  PMID: 22589890
14.  3,5-Dimethyl-1-(4-nitro­phen­yl)-1H-pyrazole 
In the title pyrazole derivative, C11H11N3O2, the benzene ring is twisted [dihedral angle = 31.38 (12)°] with respect to the pyrazole ring (r.m.s. deviation = 0.009 Å). The nitro group is effectively coplanar with the benzene ring to which it is attached [O—N—C—C torsion angle = −6.5 (3)°]. Supra­molecular chains along the b axis are formed owing to π–π inter­actions [3.8653 (2) Å] between translationally related mol­ecules involving both the five- and six-membered rings.
PMCID: PMC3343982  PMID: 22589891
15.  3-[(E)-(7-Chloro-4-quinol­yl)hydrazono­meth­yl]benzonitrile monohydrate 
The title monohydrate, C17H11ClN4·H2O, features an essentially planar organic mol­ecule, as seen in the dihedral angle of 2.42 (8)° formed between the quinoline and benzene planes. The conformation about the imine bond is E, and the N—H group is oriented towards the quinoline residue. The major feature of the crystal packing is the formation of supra­molecular chains along [100], whereby the water mol­ecule accepts one N—H⋯O hydrogen bond and makes two O—H⋯N hydrogen bonds. A C—H⋯O link is also present.
PMCID: PMC2971809  PMID: 21578942
16.  2-[(E)-(1H-Pyrrol-2-ylmethyl­idene)hydrazinyl]pyridine monohydrate 
The title hydrate, C10H10N4·H2O, shows a small twist in the hydro­zone derivative, the dihedral angle between the pyridine and pyrrole rings being 11.08 (12)°. The pyridine and pyrrole N atoms lie to the same side of the mol­ecule being sustained in place by hydrogen-bonding inter­actions with the water mol­ecule. Further inter­molecular O—H⋯N and N—H⋯O hydrogen bonding leads to the formation of supra­molecular arrays in the ab plane.
PMCID: PMC2971851  PMID: 21578943
17.  4-(Pyrimidin-2-yl)-1-thia-4-aza­spiro­[4.5]decan-3-one 
The title compound, C12H15N3OS, features an envelope conformation for the 1,3-thia­zolidin-4-one ring with the S atom as the flap atom. The pyrimidine ring is almost orthogonal to the 1,3-thia­zolidin-4-one ring as indicated by the N—C—C—N torsion angle of −111.96 (18)°. Supra­molecular dimers are formed in the crystal structure through the agency of C—H⋯O contacts occurring between centrosymmetrically related mol­ecules. These are linked into supra­molecular tapes along [100] via C—H⋯S contacts.
PMCID: PMC2971766  PMID: 21578902
18.  5-(3-Nitro­benz­yl)-1,3,4-thia­diazol-2-amine 
In the title mol­ecule, C9H8N4O2S, the dihedral angle between the thia­diazole and benzene rings is 73.92 (8)° and the thia­diazole group S atom is orientated towards the benzene ring, the central S—C—C—C torsion angle being 45.44 (18)°. In the crystal, supra­molecular tapes mediated by N—H⋯N hydrogen bonds and comprising alternating eight-membered {⋯HNCN}2 and 10-membered {⋯HNH⋯NN}2 synthons are formed along [010]. The tapes are consolidated into a three-dimensional network by a combination of C—H⋯O, C—H⋯S and C—H⋯π inter­actions
PMCID: PMC2971864  PMID: 21578910
19.  Bis[1-(isopropyl­ideneamino)guanidinium] bis­(3-nitro­benzoate) monohydrate 
The asymmetric unit of the title salt hydrate, 2C4H11N4 +·2C7H4NO4 −·H2O, comprises two independent 1-(isopropyl­ideneamino)guanidinium cations, two independent 3-nitro­benzoate anions and a water mol­ecule of crystallization. There are minimal geometric differences between the two planar [maximum deviations 0.061 (2) and 0.088 (2) Å] cations, and between the two almost planar anions [C–C–C–O and C–C–N–O torsion angles of 0.3 (3) and 11.1 (4) °, respectively in the first anion and −173.7 (2) and −0.1 (4), respectively in the second anion]. Extensive O—H⋯O and N—H⋯O hydrogen bonding between all components of the structure leads to the formation of a two-dimensional array with an undulating topology in the bc plane.
PMCID: PMC2972075  PMID: 21578929
20.  N-(2,6-Dimethyl­phen­yl)-2-(2-thien­yl)acetamide 
The thienyl ring in the title compound, C14H15NOS, is disordered over two diagonally opposite positions, the major component having a site-occupancy factor of 0.569 (3). The mol­ecule is highly twisted with respect to the central amide group, which is reflected in the dihedral angle formed between the thienyl and benzene rings of 77.01 (15)° [70.34 (18)° for the minor component]. In the crystal, mol­ecules self-associate into chains along [100] via N—H⋯O hydrogen bonds. The chains are reinforced by complementary C—H⋯O contacts.
PMCID: PMC2972164  PMID: 21578912
21.  7-Chloro-4-[(E)-(3-chloro­benzyl­idene)hydrazinyl]-1λ4-quinolinium 3-chloro­benzoate 
The title salt, C16H12Cl2N3 +·C7H4ClO2 −, features a non-planar cation, the dihedral angle between the quinolinium and benzene residues being 18.98 (10)°. The cation adopts an E conformation about the C—N bond, and the amine group is oriented towards the quinolinium residue. In the crystal, N—H⋯O hydrogen bonds link two cations with two anions, forming a 20-membered {⋯OCO⋯HNC3NH}2 synthon. The dimeric units are connected into a linear supra­molecular chain along [100] via π–π inter­actions [centroid–centroid distance = 3.5625 (13) Å].
PMCID: PMC2972174  PMID: 21578913
22.  4-[(2-Chloro­ethyl)amino]quinolinium chloride monohydrate 
In the title salt hydrate, C11H12ClN2 +·Cl−·H2O, the quinolin­ium core is essentially planar (r.m.s. deviation = 0.027 Å) with the chloro­ethyl side chain being almost orthogonal to the core [C—N—C—C torsion angle = −80.0 (3)°]. In the crystal packing, the water mol­ecule bridges three species, forming donor inter­actions to two chloride anions and accepting a hydrogen bond from the quinolinium H atom. The chloride anion accepts a hydrogen bond from the amine N atom with the result that a two-dimensional supra­molecular array is formed in the ac plane. A C—H⋯Cl interaction also occurs.
PMCID: PMC2971810  PMID: 21578845
23.  Bis(2-ethoxy­carbonyl­ethyl-κ2 C 1,O)(2-thioxo-1,3-dithiole-4,5-dithiol­ato-κ2 S 4,S 5)tin(IV) 
In the title compound, [Sn(C5H9O2)2(C3S5)], the immediate environment around the Sn centre is defined by two S and two C atoms that define an approximately tetra­hedral geometry. The close approach of the pendant carbonyl O atoms [Sn—O = 2.577 (3) and 2.573 (3) Å] increases the coordination number to six. Supra­molecular chains are formed along the a axis in the crystal structure owing to the presence of C—H⋯O contacts.
PMCID: PMC2971863  PMID: 21578652
24.  (S)-6-Chloro-4-cyclo­propyl­ethynyl-4-trifluoro­methyl-1H-3,1-benzoxazin-2(4H)-one 
Two independent mol­ecules comprise the crystallographic asymmetric unit in the title anti­retroviral agent Efavirenz, C14H9ClF3NO2, and these have noteworthy differences in conformation. The major difference relates to the orientation of the 2-cyclo­propyl­ethynyl residue relative to the six-membered heterocycle: this approaches an orthogonal disposition in mol­ecule a compared to a more flattened conformation in mol­ecule b, the difference being reflected in the Oring—C—C—Cethyne torsion angles of 65 (4) and 159 (5)°, respectively. The independent mol­ecules are connected via the eight-membered {⋯HNC (O)}2 amide synthon. Disorder is noted in the cyclo­propane ring of mol­ecule b in that two orientations of equal weight were discerned.
PMCID: PMC2971961  PMID: 21578886
25.  (Dimethyl sulfoxide-κO)di­phenyl­(3-thioxo-3H-1,2-dithiole-4,5-dithiol­ato-κ2 S 4,S 5)tin(IV) 
The Sn atom in the title compound, [Sn(C6H5)2(C3S5)(C2H6OS)], exists within a distorted trigonal-bipyramidal geometry defined by two S atoms of the 1,2-dithiole-3-thione-4,5-dithiol­ate dianion, two ipso-C atoms from the phenyl groups, and the O atom of the dimethyl sulfoxide mol­ecule. In this description, one of the S atoms and the O occupy axial positions. In the crystal, centrosymmetrically related mol­ecules associate via pairs of C—H⋯S contacts, forming dimeric aggregates.
PMCID: PMC2971776  PMID: 21578622

Results 1-25 (81)