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1.  (E)-N-(3,3-Di­phenyl­allyl­idene)-2-(tri­fluoro­meth­yl)aniline 
In the title compound, C22H16F3N, the C=N bond of the central imine group adopts an E conformation. The dihedral angles between the 2-(tri­fluoro­meth­yl)phenyl ring and the benzene rings are 9.34 (1) and 68.8 (1)°. The imine group displays a C—C—N=C torsion angle of 41.6 (3)°. In the crystal, weak C—H⋯F hydrogen bonds link the mol­ecules into chains parallel to the b-axis direction.
doi:10.1107/S1600536813010283
PMCID: PMC3648283  PMID: 23723903
2.  (E)-N-(3,3-Diphenyl­allyl­idene)-3-nitro­aniline 
In the title compound, C21H16N2O2, the 3-nitro­phenyl and two phenyl rings are twisted from the mean plane of the enimino fragment by 44.4 (1), 37.2 (1) and 74.1 (1)°, respectively. The crystal packing exhibits no classical inter­molecular contacts.
doi:10.1107/S1600536812040354
PMCID: PMC3470384  PMID: 23125797
3.  (E)-N-(3,3-Di­phenyl­allyl­idene)naph­thal­en-1-amine 
The title compound, C25H19N, adopts an E conformation about the C=N bond. The naphthalene ring system and the phenyl rings form dihedral angles 38.1 (1), 46.9 (8) and 48.5 (1)°, respectively, with the mean plane of the central enimino fragment. The crystal packing exhibits no directional close contacts.
doi:10.1107/S1600536813014888
PMCID: PMC3772462  PMID: 24046605
4.  (E)-2-(1,3-Diphenyl­allyl­idene)malononitrile 
The title compound, C18H12N2, adopts an E conformation with the benzyl­idenemalononitrile and phenyl groups located on opposite sides of the C=C bond. The two phenyl rings are oriented at a dihedral angle of 62.49 (7)°.
doi:10.1107/S1600536809048338
PMCID: PMC2972044  PMID: 21578880
5.  (E)-N′-(3,3-Diphenyl­allyl­idene)-p-toluene­sulfonohydrazide 
In the title compound, C22H20N2O2S, the mol­ecule adopts a twisted E configuration around the C=N bond. The two phenyl rings are twisted from each other, making a dihedral angle of 78.00 (12)°. The methyl-substituted benzene ring makes dihedral angles of 32.37 (14) and 69.70 (12)° with the two phenyl rings. In the crystal structure, mol­ecules are linked into extended chains along the b axis through inter­molecular N—H⋯O hydrogen bonds.
doi:10.1107/S1600536809013269
PMCID: PMC2977737  PMID: 21583873
6.  (E)-N-[(E)-3-(4-Nitro­phen­yl)allyl­idene]naphthalen-1-amine 
In the title compound, C19H14N2O2, the dihedral angle between the mean planes of the 4-nitro­phenyl ring and the naphthalene ring system is 12.79 (2)°. The imine group displays a C—C—N=C torsion angle of 41.0 (2)° and the C=N group has an E conformation. In the crystal, weak C—H⋯O hydrogen bonds link molecules into layers parallel to the b axis.
doi:10.1107/S1600536813006417
PMCID: PMC3629600  PMID: 23634087
7.  Crystal structure of (E)-N-[(E)-3-(4-meth­oxy­phen­yl)allyl­idene]naphthalen-1-amine 
In the title compound, C20H17NO, the dihedral angle between the mean planes of the 4-meth­oxy­phenyl ring and the naphthalene ring is 69.50 (7)°. The meth­oxy group is almost coplanar with the benzene ring to which it is connected [Cb—Cb—Om—Cm torsion angle of −7.9 (2)°; b = benzene and m = meth­oxy] and the imine group displays a C—C—N=C torsion angle is −57.2 (2)°. The imine (C=N) group has an E conformation. In the crystal, weak π–π inter­actions between the benzene rings [centroid–centroid distance = 3.7781 (10) Å] are observed.
doi:10.1107/S1600536814022521
PMCID: PMC4257298  PMID: 25484813
crystal structure; naphthalene derivative; π–π inter­actions
8.  Crystal structure of (E)-1-(2-nitro­benzyl­idene)-2,2-di­phenyl­hydrazine 
The title compound, C19H15N3O2, shows an E conformation of the imine bond. The dihedral angle between the planes of the phenyl rings in the di­phenyl­hydrazine groups is 88.52 (4)°. The 2-nitro­benzene ring shows a torsion angle of 10.17 (8)° with the C=N—N plane. A short intra­molecular C—H⋯O contact occurs. In the crystal, only van der Waals contacts occur between the mol­ecules.
doi:10.1107/S1600536814016109
PMCID: PMC4186103  PMID: 25309247
crystal structure; hydrazine; hydrogen bonding
9.  N-(3-Nitro­benzyl­idene)aniline 
In the title compound, C13H10N2O2, a Schiff base derivative, the dihedral angle between the two aromatic rings is 31.58 (3)°. The C=N double bond is essentially coplanar with the nitro­phenyl ring. The torsion angle of the imine double bond is 175.97 (13)°, indicating that the C=N double bond is in a trans configuration. The crystal structure is stabilized by C—H⋯O contacts and π–π inter­actions (centroid–centroid distances of 3.807 and 3.808Å).
doi:10.1107/S1600536808036970
PMCID: PMC2960009  PMID: 21581353
10.  A series of N-(2-phenyl­ethyl)nitro­aniline derivatives as precursors for slow and sustained nitric oxide release agents 
A series of N-(2-phenyl­ethyl)nitro­aniline derivatives is presented, demonstrating that modest changes in the functional groups cause significant differences in mol­ecular conformation, inter­molecular inter­actions and packing.
2,4-Di­nitro-N-(2-phenyl­ethyl)aniline, C14H13N3O4, (I), crystallizes with one independent mol­ecule in the asymmetric unit. The adjacent amine and nitro groups form an intra­molecular N—H⋯O hydrogen bond. The anti conformation about the ethyl C—C bond leads to the phenyl and aniline rings being essentially parallel. Mol­ecules are linked into dimers by inter­molecular N—H⋯O hydrogen bonds, such that each amine H atom participates in a three-centre inter­action with two nitro O atoms. Though the dimers pack so that the arene rings of adjacent mol­ecules are parallel, the rings are staggered and π–π inter­actions do not appear to be favoured. 4,6-Di­nitro-N,N′-bis­(2-phenyl­ethyl)benzene-1,3-di­amine, C22H22N4O4, (II), differs from (I) in the presence of a second 2-phenyl­ethyl­amine group on the substituted ring. Compound (II) also crystallizes with one unique mol­ecule in the asymmetric unit. Both amine groups are involved in intra­molecular N—H⋯O hydrogen bonds with adjacent nitro groups. Although one ethyl group adopts an anti conformation as in (I), the other is gauche, with the result that the pendant phenyl rings are not parallel. The amine group that is part of the gauche conformation participates in a three-centre N—H⋯O hydrogen bond with the nitro group of a neighbouring mol­ecule, leading to dimers as in (I). The other amine H atom does not form any inter­molecular hydrogen bonds. The packing leads to separations of ca 3.4 Å of the parallel anti phenyl and amino­benzene rings. 2-Cyano-4-nitro-N-(2-phenyl­ethyl)aniline, C15H13N3O2, (III), differs from (I) only in having a cyano group in place of the 2-nitro group. The absence of the adjacent nitro group eliminates the intra­molecular N—H⋯O hydrogen bond. Mol­ecules of (III) adopt the same anti conformation about the ethyl group as in (I), but crystallize in the higher-symmetry monoclinic space group P21/n. The mol­ecules are linked into dimers via N—H⋯N amine–cyano hydrogen bonds, while the nitro groups are not involved in any N—H⋯O inter­actions. Owing to the different symmetry, the mol­ecules pack in a herringbone pattern with fewer face-to-face inter­actions between the rings. The closest such inter­actions are about 3.5 Å between rings that are largely slipped past one another. 4-Methyl­sulfonyl-2-nitro-N-(2-phenyl­ethyl)aniline, C15H16N2O4S, (IV), differs from (I) in having a methyl­sulfonyl group in place of the 4-nitro group. The intra­molecular N—H⋯O hydrogen bond is present as in (I). However, unlike (I), the conformation about the ethyl group is gauche, so the two arene rings are nearly per­pen­dicular rather than parallel. The packing is significantly different from the other three structures in that there are no inter­molecular hydrogen bonds involving the N—H groups. The mol­ecules are arranged in tetra­gonal columns running along the c axis, with the aniline rings mostly parallel and separated by ca 3.7 Å. Taken together, these structures demonstrate that modest changes in functional groups cause significant differences in mol­ecular conformation, inter­molecular inter­actions and packing.
doi:10.1107/S0108270113025869
PMCID: PMC3818095  PMID: 24192194
crystal structure; N-(2-phenyl­ethyl)nitro­aniline derivatives; secondary amines; nitric oxide release agents
11.  4-[(1,3-Dioxo-2,3-dihydro-1H-benzo[de]isoquinolin-2-yl)meth­yl]-N′-[(E)-4-nitro­benzyl­idene]benzene­sulfono­hydrazide dimethyl sulfoxide monosolvate 
The mol­ecular structure of the title compound, C26H18N4O6S·C2H6OS, shows an E conformation of the hydrazone double bond. The presence of a methyl­ene group between the benzo[de]isoquinoline and benzene­sulfonyl moieties allows the 4-nitro­phenyl ring and the benzo[de]isoquinoline system to be parallel with respect to each other, so that the mol­ecule adopts a U-shaped spatial conformation. The dihedral angle between mean planes of these aromatic groups is 4.4 (1)°. This special arrangement enables neighboring mol­ecules to be inter­calated, forming slipped π–π inter­actions [centroid–centroid distance = 3.535 (2) Å] between the 4-nitro­phenyl and benzo[de]isoquinoline groups and point-to-face C—H⋯π inter­actions between the benzo[de]isoquinoline and benzene­sulfonyl aromatic systems. In addition, the crystal packing also features an inter­molecular N—H⋯O inter­action involving the amine group and the dimethyl sulfoxide solvent mol­ecule.
doi:10.1107/S1600536811004697
PMCID: PMC3051948  PMID: 21522382
12.  {2-[(4-Nitro­benzyl­idene)amino]-4,5,6,7-tetrahydro-1-benzo­thio­phen-3-yl}(phen­yl)methanone 
In the title compound, C22H18N2O3S, disorder is found in the benzoyl group (A and B), as well as for four C atoms of the cyclo­hexene ring. Two orientations were modeled in a 0.583 (5):0.417 (5) ratio. The cyclo­hexene ring is in a distorted chair conformation. The dihedral angles between the mean plane of the thio­phene ring and the 4-nitro­benzene and phenyl rings are 30.9 (8) and 64.8 (3) (A) and 62.4 (7)° (B). The mean planes of the 4-nitro­benzene and the phenyl rings are almost perpendicular to each other, with dihedral angles of 85.4 (1) (A) and 83.9 (8)° (B). An extensive array of weak C—H⋯O inter­actions consolidate mol­ecules into a three-dimensional architecture, forming chains along [001] and [010] and layers parallel to (011).
doi:10.1107/S1600536814012185
PMCID: PMC4051066  PMID: 24940302
13.  Crystal structure of (E)-1-(4′-meth­oxy-[1,1′-biphen­yl]-4-yl)-3-(3-nitro­phen­yl)prop-2-en-1-one 
The title compound crystallized with two independent mol­ecules in the asymmetric unit. In the crystal, they are linked to one another, forming chains enclosing (10) and (12) ring motifs.
The title compound, C22H17NO4, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. Each mol­ecule exists as an E isomer with C—C=C—C torsion angles of −175.69 (17) and −178.41 (17)° in A and B, respectively. In mol­ecule A, the planes of the terminal benzene rings are twisted by an angle of 26.67 (10)°, while the biphenyl unit is non-planar, the dihedral angle between the rings being 30.81 (10)°. The dihedral angle between the nitro­phenyl ring and the inner phenyl ring is 6.50 (9)°. The corresponding values in mol­ecule B are 60.61 (9), 31.07 (8) and 31.05 (9)°. In the crystal, mol­ecules are arranged in a head-to-head manner, with the 3-nitro­phenyl groups nearly parallel to one another. The A and B mol­ecules are linked to one another via C—H⋯O hydrogen bonds, forming chains lying parallel to (-320) and enclosing R 2 2(10) and R 2 2(12) ring motifs. The meth­oxy group in both mol­ecules is positionally disordered with a refined occupancy ratio of 0.979 (4):0.021 (4) for mol­ecule A and 0.55 (4):0.45 (4) for mol­ecule B.
doi:10.1107/S2056989014025110
PMCID: PMC4331905
crystal structure; chalcones; C—H⋯O hydrogen bonding; main-residue disorder
14.  N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-di­hydro-1H-pyrazol-4-yl)-2-(4-nitro­phen­yl)acetamide 
In the title compound, C19H18N4O4, the nitro­phenyl and phenyl rings are twisted by 67.0 (6) and 37.4 (4)°, respectively, with respect to the pyrazole ring plane [maximum deviation = 0.0042 (16) Å]. The dihedral angle between the mean planes of the phenyl rings is 59.3 (3)°. The amide group, with a C—N—C—C torsion angle of 177.54 (13)°, is twisted away from the plane of the pyrazole ring in an anti­periplanar conformation. In the crystal, N—H⋯O hydrogen bonds involving the carbonyl group on the pyrazole ring and the amide group, together with weak C—H⋯O inter­actions forming R 2 2(10) graph-set motifs, link the mol­ecules into chains along [100]. Additional weak C—H⋯O inter­actions involving the nitro­phenyl rings further link the mol­ecules along [001], also forming R 2 2(10) graph-set motifs, thereby generating (010) layers.
doi:10.1107/S1600536814009738
PMCID: PMC4051092  PMID: 24940224
15.  (E)-1-[2-(Methyl­sulfan­yl)phen­yl]-2-({(E)-2-[2-(methyl­sulfan­yl)phen­yl]hydrazinyl­idene}(nitro)­meth­yl)diazene 
In the title compound, C15H15N5O2S2, the phenyl rings make dihedral angles of 4.03 (4) and 9.77 (5)° with the plane defined by the central N—N—C—N—N atoms (r.m.s. deviation = 0.010 Å). The C—S—C—C torsion angles of the methyl­sulfanyl groups with their respective phenyl rings are −7.47 (13) and −72.07 (13)°. The shortest centroid–centroid distance of 3.707 Å occurs between the two π-systems N—N—C—N—N and the benzene ring in the diazene 1-position. The H atom bound to the N atom is involved in intra­molecular N—H⋯N and N—H⋯S contacts, while the nitro O atoms are involved in inter­molecular C—H⋯O contacts.
doi:10.1107/S1600536811054080
PMCID: PMC3254534  PMID: 22259480
16.  2-[1-(3-{2-[(2-Hy­droxy­benzyl­idene)amino]­phen­oxy}prop­yl)-1H-1,3-benzodiazol-2-yl]phenol 
In the title compound, C29H25N3O3, the imine double bond has an E configuration. The dihedral angle between the hy­droxy­phenyl and benzene rings in the imine moiety is 26.95 (9)°, and the dihedral angle between the hy­droxy­phenyl and benzimidazole rings in the other moiety is 14.83 (9)°. These angles are probably limited to small values as a consequence of two strong intra­molecular O—H⋯N hydrogen bonds formed between the hy­droxy groups and the imine and imidazole N atoms. The aliphatic chain linking the two ring systems has a gauche conformation, as reflected in C—C—C—O torsion angle of 70.9 (2)°.
doi:10.1107/S1600536811005319
PMCID: PMC3052110  PMID: 21522409
17.  (2E)-3-(4-Methyl­phen­yl)-1-(3-nitro­phen­yl)prop-2-en-1-one 
The title compound, C16H13NO3, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. The dihedral angle between the mean planes of the 4-methyl­phenyl and 3-nitro­phenyl groups is 4.0 (3)° in mol­ecule A and 16.2 (7)° in mol­ecule B. Inter­molecular C—H⋯O hydrogen bonding involving the O atoms of the 3-nitro­phenyl group of both independent mol­ecules link the mol­ecules into layers approximately parallel to the (110) plane. The layers are held together by π–π stacking inter­actions between the 4-methyl­phenyl ring of mol­ecule A and the 3-nitro­phenyl ring of mol­ecule B of the adjacent layer, with the distance between the centroids of inter­acting rings being 3.6987 (7) Å.
doi:10.1107/S160053680706182X
PMCID: PMC2914892  PMID: 21200665
18.  (E)-1-(4-Nitro­benzyl­idene)-2,2-diphenyl­hydrazine 
The asymmetric unit of the title compound, C19H15N3O2, contains two mol­ecules, both of which show an E conformation of the imine bond. The dihedral angles between the phenyl rings in the phenyl­hydrazine groups are 86.09 (6) and 83.41 (5)° in the two mol­ecules. The 4-nitrobenzene rings show torsion angles of 4.4 (2) and 10.9 (2)° from the two C=N—N planes. In the crystal, C—H⋯π inter­actions and C—H⋯O hydrogen bonds are observed growing along the a, b and c axes, resulting in a complex supramolecular array.
doi:10.1107/S1600536812043681
PMCID: PMC3515317  PMID: 23284537
19.  6-Bromo-1-methyl-4-[2-(4-nitro­benzyl­idene)hydrazin-1-yl­idene]-2,2-dioxo-3,4-dihydro-1H-2λ6,1-benzothia­zine 
In the title compound, C16H13BrN4O4S, the dihedral angle between the aromatic rings is 4.1 (2)° and the C=N—N=C torsion angle is 175.5 (3)°. The nitro group is almost coplanar with the benzene ring to which it is attached [dihedral angle = 2.9 (7)°]. The thia­zine ring has an S-envelope conformation with the S atom displaced by 0.819 (3) Å from the mean plane of the other five atoms (r.m.s. deviation = 0.017 Å). In the crystal, C—H⋯O inter­actions link the mol­ecules and weak aromatic π–π stacking [centroid–centroid separation = 3.874 (2) Å] is also observed.
doi:10.1107/S1600536812035374
PMCID: PMC3435732  PMID: 22969603
20.  2-{(E)-1-[2-(4-Nitro­phen­yl)hydrazin-1-yl­idene]eth­yl}benzene-1,3-diol 
The title compound, C14H13N3O4, is close to planar, the dihedral angle between the terminal benzene rings being 5.80 (16)°; the nitro group is coplanar with the benzene ring to which it is bonded [O—N—C—C torsion angle = −177.3 (3)°]. The hy­droxy group forms an intra­molecular hydrogen bond with the imine N atom, and the conformation about the imine bond is E. In the crystal, layers in the (101) plane with an undulating topology are formed by O—H⋯O and N—H⋯O hydrogen bonds along with C—H⋯O inter­actions. Centrosymmetrically related layers are connected via π–π inter­actions [ring centroid–centroid distance = 3.5739 (19) Å] into double layers.
doi:10.1107/S1600536812005399
PMCID: PMC3295468  PMID: 22412579
21.  Crystal structures of (E)-(3-ethyl-1-methyl-2,6-di­phenyl­piperidin-4-yl­idene)amino phenyl carbonate and (E)-(3-isopropyl-1-methyl-2,6-di­phenyl­piperidin-4-yl­idene)amino phenyl carbonate 
The title compounds are the 3-ethyl, (I), and 3-isopropyl, (II), derivatives of (1-methyl-2,6-diphenylpiperidin-4-ylidene)amino phenyl carbonate. The main difference in the conformation of the two compounds is the angle of inclination of the phenoxycarbonyl ring with respect to the piperidine ring mean plane, with a dihedral angle of 2.05 (8)° in (I) and 45.24 (13)° in (II).
In the title compounds, C27H28N2O3, (I), and C28H30N2O3, (II), the conformation about the C=N bond is E. The piperidine rings adopt chair conformations with the attached phenyl rings almost normal to their mean planes, the dihedral angles being 85.82 (8) and 85.84 (7)° in (I), and 87.98 (12) and 86.42 (13)° in (II). The phenyl rings are inclined to one another by 52.87 (8)° in (I) and by 60.51 (14)° in (II). The main difference in the conformation of the two compounds is the angle of inclination of the phen­oxy­carbonyl ring to the piperidine ring mean plane. In (I), these two planes are almost coplanar, with a dihedral angle of 2.05 (8)°, while in (II), this angle is 45.24 (13)°. In the crystal of (I), mol­ecules are linked by C—H⋯O hydrogen bonds, forming inversion dimers with R 2 2(14) loops. The dimers are linked via C—H⋯π inter­actions forming a three-dimensional network. In the crystal of (II), there are no significant inter­molecular inter­actions present.
doi:10.1107/S1600536814018893
PMCID: PMC4257207  PMID: 25484651
crystal structure; piperidine; oxime; 2,6-di­phenyl­piperidine
22.  Dimethyl (2Z)-2-[4-((1Z)-1-{2-[(2Z,5Z)-5-(2-meth­oxy-2-oxo­ethyl­idene)-4-oxo-3-phenyl-1,3-thia­zolidin-2-yl­idene]hydra­zin-1-yl­idene}eth­yl)anilino]but-2-ene­dio­ate 
The mol­ecule of the title compound, C26H24N4O7S, adopts a trans conformation about the central N—N bond, presumably to minimize steric between the substituents on these two atoms. An intra­molecular N—H⋯O hydrogen bond occurs. The phenyl ring is disordered over two sets of sites, with an occupancy ratio of 0.624 (8):0.376 (8). The azolidine ring is essentially planar [maximum deviation = 0.008 (5) Å] and makes a dihedral angle of 4.3 (2)° with the benzene ring and dihedral angles of 74.1 (3) and 69.1 (5)°, respectively, with the mean planes of the major and minor components of the disordered phenyl ring. The packing in the crystal is aided by the formation of several weak C—H⋯O and C—H⋯N inter­actions.
doi:10.1107/S1600536813032042
PMCID: PMC3885086  PMID: 24454262
23.  Crystal structure of bis­(4-nitro­aniline-κN 1)(5,10,15,20-tetra­phenyl­por­phy­rin­ato-κ4 N)cobalt(III) chloride di­chloro­methane monosolvate 
The reaction of [CoIII(TPP)Cl] (TPP is the dianion of 5,10,15,20-tetra­phenyl­porphyrin) with an excess of 4-nitro­aniline in di­chloro­methane leads to the title compound, [CoIII(C44H28N4)(C6H6N2O2)2]Cl·CH2Cl2. The CoIII ion lies on an inversion centre and is octa­hedrally coordinated by two N atoms of the NH2 groups of the two 4-nitro­aniline trans-axial ligands and four pyrrole N atoms of the porphyrin. The asymmetric unit contains one half of the [CoIII(TPP)(4-nitro­aniline)2]+ ion complex, one chloride counter-ion (lying on a twofold rotation axis) and one half di­chloro­methane solvent mol­ecule, where the C atom lies on a twofold rotation axis. The average equatorial Co—N(pyrrole) distance (Co—Np) is 1.982 (2) Å and the axial Co—N(4-nitro­aniline) bond length is 2.006 (2) Å. The crystal packing is stabilized by an N—H⋯Cl hydrogen bond between the N atom of the amino group of the 4-nitro­aniline axial ligand and the chloride counter-ion. The supra­molecular architecture is further stabilized by weak C—H⋯π inter­actions.
doi:10.1107/S1600536814016274
PMCID: PMC4186082  PMID: 25309176
crystal structure; cobalt(III) complex; 5,10,15,20-tetra­phenyl­porphyrin ligand
24.  1-(2,4-Di­nitro­phen­yl)-2-[(E)-(3,4,5-tri­meth­oxy­benzyl­idene)]hydrazine 
Mol­ecules of the title compound, C16H16N4O7, are not planar with a dihedral angle of 5.50 (11)° between the substituted benzene rings. The two meta-meth­oxy groups of the 3,4,5-tri­meth­oxy­benzene moiety lie in the plane of the attached ring [Cmeth­yl–O–C–C torsion angles −0.1 (4)° and −3.7 (3)°] while the para-meth­oxy substituent lies out of the plane [Cmeth­yl—O—C—C, −86.0 (3)°]. An intra­molecular N—H⋯O hydrogen bond involving the 2-nitro substituent generates an S(6) ring motif. In the crystal structure, mol­ecules are linked by weak C—H⋯O inter­actions into screw chains, that are arranged into a sheet parallel to the bc plane. These sheets are connected by π–π stacking inter­actions between the nitro and meth­oxy substituted aromatic rings with a centroid–centroid separation of 3.9420 (13) Å. C—H⋯π contacts further stabilize the two-dimensional network.
doi:10.1107/S1600536814001238
PMCID: PMC3998339  PMID: 24764900
25.  (E)-4-Meth­oxy-N′-(2,4,5-tri­meth­oxy­benzyl­idene)benzohydrazide hemihydrate 
The title compound crystallizes as a hemihydrate, C18H20N2O5·0.5H2O. The mol­ecule exists in an E conformation with respect to the C=N imine bond. The 4-meth­oxy­phenyl unit is disordered over two sets of sites with a refined occupancy ratio of 0.54 (2):0.46 (2). The dihedral angles between the benzene rings are 29.20 (9) and 26.59 (9)°, respectively, for the major and minor components of the 4-meth­oxy-substituted ring. All meth­oxy substituents lie close to the plane of the attached benzene rings [the Cmeth­yl—O—C—C torsion angles range from −4.0 (12) to 3.9 (2)°]. In the crystal, the components are linked into chains propagating along [001] via N—H⋯O and O—H⋯O hydrogen bonds and weak C—H⋯O inter­actions.
doi:10.1107/S1600536814000531
PMCID: PMC3998312  PMID: 24764873

Results 1-25 (1064475)