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1.  2-{(E)-[(2Z)-2-(1,2-Di­hydro­phthalazin-1-yl­idene)hydrazinyl­idene]meth­yl}phenol 
The title compound, C15H12N4O, adopts an E conformation with respect to the azomethine bond and crystallizes in its hydrazinyl­idene tautomeric form. The dihedral angle between the ring systems is 15.98 (7)°. The phenol O—H group forms an intra­molecular O—H⋯N hydrogen bond. In the crystal, pairs of N—H⋯N and C—H⋯O hydrogen bonds link neighbouring mol­ecules into centrosymmetric dimers. These dimers are inter­connected by means of three types of π–π stacking inter­actions. One, with a centroid–centroid distance of 3.577 (1) Å [inter­planar separation = 3.4673 (6) Å], connects adjacent mol­ecules into centrosymmetric dimers. The other two inter­actions, on the outward facing sides of the dimers, are between phenol rings of neighboring mol­ecules [centroid–centroid separation = 3.7907 (13) Å and inter­planar separation = 3.5071 (8) Å], and between phthalazin units [centroid–centroid separation = 3.6001 (12) Å and inter­planar separation = 3.4891 (7) Å]. In combination, the π–π inter­actions lead to the formation of infinite layers with mol­ecules stacked along [0-11]. These layers are, in turn, connected with neighbouring layers through the N—H⋯N and C—H⋯O hydrogen bonds, yielding a three-dimensional supra­molecular architecture.
doi:10.1107/S1600536813024203
PMCID: PMC3790393  PMID: 24098212
2.  (3-Chloro­phen­yl)[(E)-2-(1,3-di­thio­lan-2-yl­idene)hydrazinyl­idene]methyl 3-chloro­benzoate 
In the title compound, C17H12Cl2N2O2S2, the di­thia­cyclo­pentane ring has an envelope conformation with one of the methyl­ene C atoms as the flap. The chloro­phenyl rings make a dihedral angle of 82.63 (7)°. In the crystal, π–π inter­actions between the benzene rings of neighbouring mol­ecules [centroid–centroid distance = 3.547 (2) Å] link the mol­ecules into inversion dimers. Weak non-classical C—H⋯X (X = O, N, Cl) inter­actions further consolidate the packing, forming a layer structure parallel to (110).
doi:10.1107/S1600536813009239
PMCID: PMC3648247  PMID: 23723867
3.  4-[(2E)-2-(4-Chloro­benzyl­idene)hydrazinyl­idene]-1-methyl-1,4-dihydro­pyridine monohydrate 
In the title compound, C13H12ClN3·H2O, the organic mol­ecule is almost planar, with a dihedral angle of 3.22 (10)° between the benzene and pyridine rings. The crystal structure is stabilized by O—H⋯N and C—H⋯O hydrogen bonding and π–π stacking inter­actions [centroid–centroid distances = 3.630 (1) and 3.701 (1) Å].
doi:10.1107/S1600536810015709
PMCID: PMC2979526  PMID: 21579416
4.  (E)-[2-(1,3-Dithio­lan-2-yl­idene)hydrazinyl­idene](3-fluoro­phen­yl)methyl 3-fluoro­benzoate 
In the title compound, C17H12F2N2O2S2, the conformation of the dithia­cyclo­pentane ring is a half-chair, with a total puckering amplitude Q T = 0.460 (1) Å. π–π inter­actions [centroid–centroid distance = 3.585 (9) Å between the fluoro­phenyl rings of neighbouring mol­ecules] and C—H⋯N and C—H⋯O inter­actions help to stabilize the crystal structure and form ladders along the c axis.
doi:10.1107/S1600536813007319
PMCID: PMC3629619  PMID: 23634106
5.  2-(2-{[2-(4-Pyridylcarbon­yl)hydrazinyl­idene]meth­yl}phen­oxy)acetic acid 
In the title compound, C15H13N3O4, the pyridine and benzene rings are nearly perpendicular [dihedral angle = 84.24 (5)°]. In the crystal structure, classical O—H⋯N hydrogen bonding between the OH group of the carboxyl unit and a neighbouring pyridine ring N atom and N—H⋯O hydrogen bonding between the imine NH group and a neighbouring O atom of an acyl unit, together with complementary non-classical C—H⋯O hydrogen bonds between carboxyl O atoms and neighbouring CH groups, link the mol­ecules into a three-dimensional system.
doi:10.1107/S1600536810017083
PMCID: PMC2979532  PMID: 21579430
6.  4-{[2-(2,4-Dinitro­phen­yl)hydrazinyl­idene]meth­yl}phenol ethanol hemisolvate 
In the title compound, C13H10N4O5·0.5C2H5OH, the two benzene rings form a dihedral angle of 4.29 (9)°. The ethanol solvent mol­ecule was treated as disordered between two orientations related by symmetry (center of inversion), with occupancies fixed at 0.5. The crystal packing, stabilized by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds and π–π inter­actions [indicated by the short distance of 3.7299 (7) Å between the centroids of benzene rings from neighbouring mol­ecules], exhibits short inter­molecular O⋯O contacts of 2.8226 (3) Å.
doi:10.1107/S1600536810045782
PMCID: PMC3011783  PMID: 21589441
7.  rac-(3S,4Z)-3-Chloro-4-[2-(3-fluoro­benzyl­idene)hydrazinyl­idene]-1-methyl-3,4-dihydro-1H-2λ6,1-benzothia­zine-2,2-dione 
In the title compound, C16H13ClFN3O2S, the dihedral angle between the benzene rings is 4.47 (3)°. The conformation of the thia­zine ring is a half-chair and the Cl atom is in an axial orientation. In the crystal, mol­ecules are linked by C—H⋯F inter­actions, generating C(12) chains propagating in [011]. Aromatic π–π stacking inter­actions [centroid–centroid separations = 3.753 (2) and 3.758 (2) Å] also occur.
doi:10.1107/S1600536812021654
PMCID: PMC3379366  PMID: 22719564
8.  6-Bromo-1-methyl-4-[2-(1-phenyl­ethyl­idene)hydrazinyl­idene]-3,4-dihydro-1H-2λ6,1-benzothia­zine-2,2-dione 
In the title compound, C17H16BrN3O2S, the dihedral angle between the aromatic rings is 1.24 (15)° and the C=N—N=C torsion angle is 167.7 (3)°. The conformation of the thia­zine ring is an envelope, with the S atom displaced by 0.805 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.027 Å). In the crystal, C—H⋯O inter­actions link the mol­ecules into C(10) [010] chains. A weak C—H⋯π inter­action is also observed.
doi:10.1107/S1600536812051380
PMCID: PMC3569229  PMID: 23424452
9.  Bis[N-(2-hy­droxy­eth­yl)-N-propyl­dithio­carbamato-κ2 S,S′]bis­(4-{[(pyridin-4-yl­methyl­idene)hydrazinyl­idene]meth­yl}pyridine-κN 1)cadmium 
The complete mol­ecule of the title compound, [Cd(C6H12NOS2)2(C12H10N4)2], is generated by crystallographic inversion symmetry. The distorted octa­hedral trans-N2S4 donor set for the Cd2+ ion is defined by two symmetrically S,S′-chelating dithio­carbamate anions and two pyridine N atoms derived from two monodentate 4-pyridine­aldazine (or 4-{[(pyridin-4-yl­methyl­idene)hydrazinyl­idene}meth­yl]pyridine) mol­ecules [dihedral angle between the aromatic rings = 17.33 (8)°]. In the crystal, mol­ecules are connected into a supra­molecular chain via O—H⋯N hydrogen bonds involving the 4-pyridine­aldazine N atoms not involved in coordination to cadmium. Weak C—H⋯O and C—H⋯N links consolidate the packing.
doi:10.1107/S1600536811004508
PMCID: PMC3052135  PMID: 21522253
10.  2-[2-(2-Carb­oxy­phen­yl)hydrazinyl­idene]-3-oxo-N-phenyl­butyramide 
In the title compound, C17H15N3O4, the mol­ecule is in the keto–hydrazone form. Intra­molecular N—H⋯O hydrogen bonds ensure that the mol­ecule is nearly planar (r.m.s. deviation of non-H atoms is 0.098 Å), with the two benzene rings forming a dihedral angle of 10.04 (2)°. In the crystal, inversion dimers are formed via pairs of O—H⋯O hydrogen bonds involving the –CO2H groups.
doi:10.1107/S1600536811048173
PMCID: PMC3239046  PMID: 22199894
11.  (E)-1-(4-Nitro­phen­yl)-2-(4-{[(E)-2-(4-nitro­phen­yl)hydrazinyl­idene]meth­yl}benzyl­idene)hydrazine dihydrate 
The 30 non-H atoms in title dihydrazine compound, C20H16N6O4·2H2O, are close to coplanar, the r.m.s. deviation for these atoms being 0.096 Å. The conformation about each of the C=N bonds is E, and the mol­ecule has non-crystallographic 2/m symmetry. The presence of O—H⋯O and N—H⋯O hydrogen bonding leads to a three-dimensional network in the crystal structure. A highly disordered solvent mol­ecule is present within a mol­ecular cavity defined by the organic and water mol­ecules. Its contribution to the electron density was removed from the observed data in the final cycles of refinement and the formula, molecular weight and density are given without taking into account the contribution of the solvent molecule.
doi:10.1107/S1600536809053963
PMCID: PMC2980149  PMID: 21580076
12.  4-[2-(Anthracen-9-yl­methyl­idene)hydrazinyl­idene]-3-chloro-1-methyl-3,4-dihydro-1H-2λ6,1-benzothia­zine-2,2-dione 
In the title compound, C24H18ClN3O2S, the dihedral angle between the benzene ring and the anthracene ring system is 41.10 (8)°. The thia­zine ring has a half-chair conformation and the Cl atom is in an axial orientation. In the crystal, mol­ecules are linked by C—H⋯O inter­actions, generating C(8) chains along [100]. A C—H⋯N short contact occurs in the mol­ecule, generating an S(6) ring.
doi:10.1107/S1600536812021642
PMCID: PMC3379367  PMID: 22719565
13.  (E)-4-{[2-(2-Furylcarbon­yl)hydrazinyl­idene]meth­yl}-2-meth­oxy­phenyl acetate 
The mol­ecule of the title Schiff base compound, C15H14N2O5, was obtained from a condensation reaction of 4-acet­oxy-3-meth­oxy­benzaldehyde and 2-furyl­carbonyl­hydrazide. In the mol­ecule, the furyl ring makes a dihedral angle of 14.63 (10)° with the benzene ring. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains along the b axis. Futhermore, weak C—H⋯O inter­actions connect the chains, forming corrugated layers parallel to (001). The dihedral angle between the rings is 14.63 (10)°.
doi:10.1107/S1600536811008932
PMCID: PMC3099912  PMID: 21754157
14.  Methyl 2-meth­oxy-4-{[2-(4-nitro­phen­yl)hydrazinyl­idene]meth­yl}benzoate 
The mol­ecule of the title Schiff base compound, C16H15N3O5, obtained from a condensation reaction of 4-acet­oxy-3-meth­oxy­benzaldehyde and 4-nitro­phenyl­hydrazine, adopts an E geometry with respect to the C=N double bond. The mol­ecule is roughly planar, with the two benzene rings twisted slightly with respect to each other by a dihedral angle of 6.90 (9)°. In the crystal, inter­molecular N—H⋯O hydrogen bonds link centrosymmetrically related pairs of mol­ecules, forming dimers of R 2 2(22) graph-set motif. The dimers are further connected through slipped π–π inter­actions between symmetry-related benzene rings [centroid–centroid distance of 3.646 (1) Å, offset angle of 15.4°].
doi:10.1107/S160053681003802X
PMCID: PMC2983317  PMID: 21587632
15.  Ethyl 2-[(2,4-difluoro­phen­yl)hydrazinyl­idene]-3-oxobutano­ate 
The asymmetric unit of the title compound, C12H12F2N2O3, contains two mol­ecules, both of which exist in an E conformation with respect to their C=N bonds [1.321 (6) and 1.310 (6) Å]. The mol­ecular conformations are supported by intra­molecular N—H⋯O hydrogen bonds, which generate S(6) rings. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯F hydrogen bonds into layers lying parallel to (001). The crystal studied was an inversion twin with a 0.58 (1):0.42 (1) domain ratio.
doi:10.1107/S1600536812000803
PMCID: PMC3275180  PMID: 22347036
16.  4-{2-[2-(4-Chloro­benzyl­idene)hydrazinyl­idene]-3,6-dihydro-2H-1,3,4-thia­diazin-5-yl}-3-(4-meth­oxy­phen­yl)sydnone 
The title compound, C19H15ClN6O3S, exists in trans and cis configurations with respect to the acyclic C=N bonds. The 3,6-dihydro-2H-1,3,4-thia­diazine ring adopts a half-boat conformation. The sydnone ring is approximately planar [maximum deviation = 0.013 (1) Å] and forms dihedral angles of 34.76 (4) and 48.67 (4)° with the benzene rings. An intra­molecular C—H⋯O hydrogen bond stabilizes the mol­ecular structure and forms an S(6) ring motif. In the crystal packing, inter­molecular N—H⋯N hydrogen bonds link centrosymmetrically related mol­ecules into dimers, generating R 2 2(8) ring motifs. The dimers are then linked into a three-dimensional network by inter­molecular C—H⋯O and C—H⋯Cl hydrogen bonds, and by C—H⋯π inter­actions. Further stabilization is provided by π–π inter­actions involving the sydnone rings, with centroid–centroid separations of 3.4198 (5) Å.
doi:10.1107/S1600536811013900
PMCID: PMC3089192  PMID: 21754480
17.  4-{2-[2-(4-Chloro­benzyl­idene)hydrazinyl­idene]-3,6-dihydro-2H-1,3,4-thia­diazin-5-yl}-3-phenyl­sydnone 
The title compound, C18H13ClN6O2S, exists in trans and cis configurations with respect to the acyclic C=N bonds [C=N = 1.2837 (15) and 1.3000 (14) Å, respectively]. The 3,6-dihydro-2H-1,3,4-thia­diazine ring adopts a half-boat conformation. The sydnone ring is approximately planar [maximum deviation = 0.002 (1) Å] and forms dihedral angles of 50.45 (7) and 61.21 (6)° with the aromatic rings. In the crystal, inter­molecular N—H⋯N, C—H⋯Cl and C—H⋯S hydrogen bonds link the mol­ecules into layers parallel to ab plane. The crystal packing is stabilized by C—H⋯π inter­actions and further consolidated by π–π inter­actions involving the phenyl rings [centroid–centroid distance = 3.6306 (7) Å].
doi:10.1107/S1600536811013912
PMCID: PMC3089094  PMID: 21754481
18.  3-Chloro-4-[2-(4-chloro­benzyl­idene)hydrazinyl­idene]-1-methyl-3,4-dihydro-1H-2λ6,1-benzothia­zine-2,2-dione 
In the title compound, C16H13Cl2N3O2S, the dihedral angle between the aromatic rings is 6.62 (2)° and the C=N—N=C torsion angle is 176.2 (4)°. The thia­zine ring shows an envelope conformation, with the S atom displaced by 0.633 (6) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.037 Å). The Cl atom is an an axial conformation and is displaced by 2.015 (6) Å from the thia­zine ring plane. In the crystal, mol­ecules are linked by C—H⋯O inter­actions, generating a three-dimensional network. Very weak aromatic π–π stacking inter­actions [centroid–centroid separations = 3.928 (2) Å] are also observed.
doi:10.1107/S1600536813004443
PMCID: PMC3588526  PMID: 23476596
19.  (2E)-4-(4-Bromo­phen­yl)-2-{(2Z)-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-3-phenyl-2,3-di­hydro-1,3-thia­zole 
In the title compound, C24H20BrN3S, the di­hydro­thia­zole ring is approximately planar, with a maximum deviation of 0.008 (2) Å, and is twisted with respect to the 4-bromo­phenyl ring, the phenyl ring and methyl­phenyl ring, making dihedral angles of 47.96 (8), 59.52 (9) and 16.96 (9)°, respectively. In the crystal, weak C—H⋯π inter­actions link inversion-related mol­ecules into supra­molecular dimers.
doi:10.1107/S1600536813025506
PMCID: PMC3790424  PMID: 24098243
20.  rac-(6S)-6-Hy­droxy-6-{2-[2-(propan-2-yl­idene)hydrazinyl­idene]prop­yl}indolo[2,1-b]quinazolin-12(6H)-one 
The chiral title compound, C21H20N4O2, crystallizes as a racemic mixture. In the crystal, mol­ecules form centrosymmetric π-overlapping dimers [inter­planar distance = 3.338 (6) Å], which are further connected along the a axis forming centrosymmetric dimers via O—H⋯N hydrogen bonds. C—H⋯O inter­actions are also observed. The indolo[2,1-b]quinazoline group is somewhat bent, with a small dihedral angle of 6.3 (4)° between the plane of the quinazoline system and the plane of the benzene ring of the indole moiety. The C=N—N=C atoms of the azine group is oriented almost perpendicular [84.1 (2)°] to the mean plane of the quinazoline system.
doi:10.1107/S1600536811037408
PMCID: PMC3201358  PMID: 22065467
21.  Methyl (2Z)-((2Z)-2-{(2E)-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-4-oxo-3-phenyl-1,3-thia­zolidin-5-yl­idene)ethano­ate 
The asymmetric unit of the title compound, C21H19N3O3S, contains two independent mol­ecules. In one mol­ecule, the 1,3-thia­zolidine ring forms dihedral angles of 86.19 (8) and 8.37 (8)° with the phenyl and benzene rings, respectively. The corresponding dihedral angles in the other mol­ecule are 69.60 (7) and 14.08 (7)°. The dihedral angle between the phenyl and benzene rings is 84.70 (8)° in one mol­ecule and 69.62 (8)° in the other. In the crystal, mol­ecules pack in layers approximately parallel to (10-2). There are weak C—H⋯O hydrogen bonds within these layers. Further weak C—H⋯O hydrogen bonding occurs between the layers to form a three-dimensional network. A weak C—H⋯π inter­action is also observed.
doi:10.1107/S1600536813021533
PMCID: PMC3884445  PMID: 24427040
22.  1-Ethyl-4-{2-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-3,4-dihydro-1H-2λ6,1-benzothia­zine-2,2-dione 
In the title compound, C19H21N3O2S, the dihedral angle between the aromatic rings is 6.7 (2)° and the C=N—N=C torsion angle is 178.0 (2)°. The conformation of the thia­zine ring is an envelope, with the S atom displaced by 0.802 (2) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.022 Å). In the crystal, mol­ecules are linked by C—H⋯O inter­actions, generating C(5) chains propagating in [010]. A weak C—H⋯π inter­action is also observed.
doi:10.1107/S1600536813000202
PMCID: PMC3569261  PMID: 23424484
23.  2-[2-(4-Acetyl­phen­yl)hydrazinyl­idene]-1,3-diphenyl­propane-1,3-dione 
In the title compound, C23H18N2O3, the inter­planar angle between the benzoyl units is 80.51 (6)° while the dihedral angles between the hydrazinyl­idene and benzoyl groups are 43.43 (6) and 54.16 (6)°. In the crystal, a strong resonance-assisted intra­molecular N—H⋯O hydrogen bond is observed. The mol­ecules form an inversion dimer via a pair of weak C—H⋯O hydrogen bonds and a π–π inter­action [centroid–centroid distance of 3.5719 (10) Å]. These dimers are linked via weak C—H⋯O contacts, forming chains along the b axis.
doi:10.1107/S1600536811027590
PMCID: PMC3213496  PMID: 22091075
24.  Ethyl 2-[2-(3-meth­oxy­phen­yl)hydrazinyl­idene]-3-oxobutano­ate 
The title compound, C13H16N2O4, is approximately planar (r.m.s. deviation = 0.065 Å for the 19 non-H atoms). An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif and the mol­ecule adopts an E conformation with respect to the central C=N double bond. In the crystal, pairs of inter­molecular C—H⋯O hydrogen bonds link adjacent mol­ecules into inversion dimers. The crystal structure also features weak C—H⋯π inter­actions.
doi:10.1107/S1600536811039444
PMCID: PMC3201266  PMID: 22065239
25.  2-{(E)-[(2Z)-(3-Chloro-1-methyl-2,2-di­oxo-3,4-dihydro-1H-2,1-benzo­thia­zin-4-yl­idene)hydrazinyl­idene]meth­yl}phenol 
In the title compound, C16H14ClN3O3S, the thia­zine ring adopts a sofa (half-chair) conformation, with an r.m.s. deviation from the mean plane of 0.23 Å. The S atom and S-bonded C atom exhibit the maximum deviations from the thia­zine mean plane [−0.3976 (12) and 0.3179 (14) Å, respectively]. The conformations around the double bonds in the R 2C=N—N=CHR unit are Z and E. An intra­molecular O—H⋯N hydrogen bond with the hy­droxy group as donor generates an S(6) ring motif. In the crystal, pairs of weak C—H⋯O inter­actions connect the mol­ecules, forming inversion dimers.
doi:10.1107/S1600536811055978
PMCID: PMC3275000  PMID: 22346945

Results 1-25 (116223)