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1.  1-Nitro-4-(4-nitro­phen­oxy)benzene: a second monoclinic polymorph 
In the title compound, C12H8N2O5, the aromatic rings are inclined to one another by 56.14 (7)°. The nitro groups are inclined by to the benzene rings to which they are attached by 3.86 (17) and 9.65 (15)°. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds, forming a three-dimensional structure. The title compound is a new monoclinic polymorph, crystallizing in space group P21/c. The first polymorph crystallized in space group C2/c and the mol­ecule possesses twofold rotation symmetry. Two low-temperature structures of this polymorph (150 K and 100 K, respectively) have been reported [Meciarova et al. (2004). Private Communication (refcode IXOGAD). CCDC, Cambridge, England, and Dey & Desiraju (2005). Chem. Commun. pp. 2486–2488].
doi:10.1107/S1600536813029346
PMCID: PMC3885027  PMID: 24454202
2.  4-Nitro­phenyl 2-chloro­benzoate 
The aromatic rings in the title compound, C13H8ClNO4, enclose a dihedral angle of 39.53 (3)°. The nitro group is almost coplanar with the ring to which it is attached [dihedral angle = 4.31 (1)°]. In the crystal, mol­ecules are connected by C—H⋯O hydrogen bonds into chains running along [001].
doi:10.1107/S1600536812050362
PMCID: PMC3588303  PMID: 23476475
3.  N-[4-(4-Nitro­phen­oxy)phen­yl]penta­n­amide 
The asymmetric unit of the title compound, C17H18N2O4, contains two independent mol­ecules (A and B) differing principally in the conformations of the alkyl chains, anti for molecule A and gauche for molecule B. The dihedral angles between the aromatic rings are 82.51 (6) and 82.25 (6)° in the two molecules. In the crystal, amide–amide inter­actions (as N—H⋯O=C) results in distinct chains of A and B mol­ecules running parallel to the a-axis direction. C—H⋯O inter­actions also occur.
doi:10.1107/S1600536812036744
PMCID: PMC3435840  PMID: 22969686
4.  N-[4-(4-Nitro­phen­oxy)phen­yl]acetamide 
The asymmetric unit of the title compound, C14H12N2O4, contains two mol­ecules that differ principally in the orientation of the acetamide substituent to the adjacent benzene ring with dihedral angles of 44.77 (7) and 19.06 (7)°. The dihedral angles between the benzene rings are 64.46 (4) and 80.84 (4)°. In the crystal, classical N—H⋯O hydrogen bonds form C(4) chains along [100]. These chains are inter­linked by C—H⋯O contacts forming R 2 2(10) rings. In the crystal, π–π inter­actions are observed with a distance of 3.5976 (18) Å between the centroids of the nitro-substituted benzene rings of one type of mol­ecule.
doi:10.1107/S1600536812031856
PMCID: PMC3414940  PMID: 22904927
5.  4-Pheneth­oxy­aniline hemihydrate 
The crystal structure of the title compound, C14H15NO·0.5H2O, features N—H⋯O and O—H⋯N hydrogen bonds between the amino group and water molecule of crystallization, which generate a chain along the c axis. The water mol­ecule lies on a twofold rotation axis. A C—H⋯π inter­action is observed between the phenyl and aniline rings. The angle between the mean planes of the phenyl rings is 72.51 (7)°.
doi:10.1107/S1600536812022994
PMCID: PMC3379468  PMID: 22719666
6.  4-[(E)-({4-[(4-Amino­phen­yl)sulfon­yl]phen­yl}imino)­meth­yl]phenol ethanol monosolvate 
In the title compound, C19H16N2O3S·C2H6O, the 4-hy­droxy­benzyl­idene group is oriented at dihedral angles of 73.17 (7) and 77.06 (7)° with respect to the aniline groups. The sulfonyl group make dihedral angles of 44.89 (13) and 59.16 (12)° with the adjacent aniline groups. In the crystal, a two-dimensional polymeric network parallel to (010) is formed by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds. There also exist π–π inter­actions with a distance of 3.5976 (18) Å between the centroids of hy­droxy­phenyl rings.
doi:10.1107/S1600536812021563
PMCID: PMC3379368  PMID: 22719566
7.  (3-Benzoyl­phen­yl)(phen­yl)methanone 
Mol­ecules of the title compound, C20H14O2, show approximate C s symmetry with the approximate mirror plane perpendicular to the central ring. The torsion angles about the acyclic bonds are 30.05 (15) and 30.77 (15)° in one half compared to −36.62 (14) and −18.60 (15)° in the other half of the mol­ecule. The central aromatic ring makes dihedral angles of 47.78 (4) and 51.68 (3)° with the two terminal rings.
doi:10.1107/S1600536811033344
PMCID: PMC3200948  PMID: 22059009
8.  4-(4-Nitro­phen­oxy)butanol 
The crystal structure of the title compound, C10H13NO4, features inter­molecular O—H⋯O(nitro) hydrogen bonding, which links mol­ecules into supra­molecular chains running parallel to the bc diagonal. There is also π–π stacking between 4-nitro­phenyl groups, the inter­planar distance between the nitro­benzene rings being 3.472 (2) Å.
doi:10.1107/S1600536811007744
PMCID: PMC3100064  PMID: 21754089
9.  4-Nitro­phenyl 1-naphthoate 
In the title compound, C17H11NO4, the dihedral angle between the two benzene rings is 8.66 (3)°. The nitro group is twisted by 4.51 (9)° out of the plane of the aromatic ring to which it is attached. The presence of inter­molecular C—H⋯O contacts in the crystal structure leads to the formation of chains along the c axis.
doi:10.1107/S1600536810011736
PMCID: PMC2979124  PMID: 21579087
10.  2-{5-[2-(4-Nitro­phen­oxy)phen­yl]-1-phenyl-1H-pyrazol-3-yl}phenol 
In the title compound, C27H19N3O4, the phenol and pyrazole rings are almost coplanar [dihedral angle = 0.95 (12)°] due to an intra­molecular O—H⋯N hydrogen bond, whereas the phenyl ring is tilted by 40.81 (7)° with respect to the plane of the pyrazole ring. The aromatic ring with a nitro­phen­oxy substituent makes a dihedral angle of 54.10 (7)° with the pyrazole ring.
doi:10.1107/S1600536810008251
PMCID: PMC2984047  PMID: 21580626
11.  4-Methyl­benzyl 4-amino­benzoate 
The dihedral angle between the two benzene rings in the title compound, C15H15NO2, is 65.28 (12)°. The crystal structure is stabilized by N—H⋯N and N—H⋯O hydrogen bonds, leading to the formation of supra­molecular chains along the a-axis direction.
doi:10.1107/S1600536810007075
PMCID: PMC2983826  PMID: 21580582
12.  1,10-Bis(4-nitro­phen­oxy)deca­ne 
The title compound, C22H28N2O6, crystallizes with four half-mol­ecules in the asymmetric unit: each mol­ecule is located about a crystallographic inversion centre. The central methyl­ene groups of two mol­ecules are disordered over two sets of equally occupied sites. The crystal packing is characterized by sheets of mol­ecules parallel to (14).
doi:10.1107/S1600536810003855
PMCID: PMC2983734  PMID: 21580301
13.  4-Nitro­phenyl 2-methyl­benzoate 
The title compound, C14H11NO4, crystallizes with two mol­ecules in the asymmetric unit. The major conformational difference between these two mol­ecules is the dihedral angle between the aromatic rings, namely 36.99 (5) and 55.04 (5)°. The nitro groups are coplanar with the phenyl rings to which they are attached, the O—N—C—C torsion angles being −1.9 (3) and 1.0 (3)° in the two mol­ecules.
doi:10.1107/S1600536809046005
PMCID: PMC2971988  PMID: 21578773
14.  4,4′-[4,4′-(Perfluoro­propane-2,2-di­yl)bis­(4,1-phenyl­eneoxy)]dianiline 
In the title compound, C27H20F6N2O2, the dihedral angles between the planes of the aromatic rings connected by the ether O atoms are 84.13 (8) and 75.06 (9)°. The crystal structure is stabilized by N—H⋯O and N—H⋯F hydrogen bonds.
doi:10.1107/S1600536809020121
PMCID: PMC2969474  PMID: 21582764
15.  6-(4-Nitro­phen­oxy)hexa­nol 
The title compound, C12H17NO4, features an almost planar mol­ecule (r.m.s. deviation for all non-H atoms = 0.070 Å). All methyl­ene C—C bonds adopt an anti­periplanar conformation. In the crystal structure the mol­ecules lie in planes parallel to (12) and the packing is stabilized by O—H⋯O hydrogen bonds.
doi:10.1107/S160053680901722X
PMCID: PMC2969679  PMID: 21583147
16.  4,4′-(Hexane-1,6-diyldi­oxy)dianiline 
The complete molecule of the title compound, C18H24N2O2, is generated by a crystallographic inversion centre. The torsion angles in the hexa­methyl­ene chain are consistent with an anti­periplanar conformation, whereas the conformation of the O—CH2—CH2—CH2 unit is gauche. The three-dimensional crystal packing is stabilized by N—H⋯O and N—H⋯N hydrogen bonding.
doi:10.1107/S160053680901321X
PMCID: PMC2977774  PMID: 21583910
17.  1,5-Bis(4-nitro­phen­oxy)penta­ne 
The title compound, C17H18N2O6, crystallizes with two mol­ecules in the asymmetric unit. In both molecules, one of the C—C bonds of the penta­methyl­ene chain connecting the two aromatic rings is in a trans conformation and another displays a gauche conformation. The aromatic rings within each mol­ecule are nearly coplanar [dihedral angles = 3.36 (9) and 4.50 (9)°] and the nitro groups are twisted slightly out of the planes of their attached rings [dihedral angles = 8.16 (3)/6.6 (2) and 4.9 (4)/3.8 (3)°].
doi:10.1107/S1600536809011672
PMCID: PMC2977647  PMID: 21583990
18.  4-(4-Nitro­phenoxy)biphen­yl 
The two phenyl rings of the biphenyl unit of the title compound, C18H13NO3, are almost coplanar [dihedral angle 6.70 (9)°]. The nitro­phenyl ring, on the other hand, is significantly twisted out of the plane of the these two rings, making dihedral angles of 68.83 (4)° with the middle ring and 62.86 (4)° with the end ring. The nitro group is twisted by 12.1 (2)° out of the plane of the phenyl ring to which it is attached.
doi:10.1107/S1600536809007417
PMCID: PMC2968949  PMID: 21582447
19.  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
20.  N-[4-(4-Nitro­phen­oxy)phen­yl]propionamide 
The title compound, C15H14N2O4, is an important inter­mediate for the synthesis of thermotropic liquid crystals. The dihedral angle between the two aromatic rings is 84.29 (4)°. An N—H⋯O hydrogen bond connects the mol­ecules into chains running along the b axis. In addition, the crystal packing is stabilized by weak C—H⋯O hydrogen bonds.
doi:10.1107/S1600536808034119
PMCID: PMC2959666  PMID: 21581044
21.  1,1,1,3,3,3-Hexafluoro-2,2-bis­[4-(4-nitro­phen­oxy)phen­yl]propane 
In the title compound, C27H16F6N2O6, the nitro groups are almost coplanar with the aromatic rings to which they are attached [dihedral angles = 3.5 (5) and 6.2 (3)°]. The dihedral angles between adjacent aromatic rings are 78.07 (8) and 71.11 (8)° for nitro­phen­yl/phenyl and 69.50 (8)° for phen­yl/phenyl. An inter­molecular C—H⋯π inter­action seems to be effective in the stabilization of the structure.
doi:10.1107/S1600536808022101
PMCID: PMC2962162  PMID: 21203242
22.  1,2-Bis(4-amino­phen­oxy)ethane 
The mol­ecule of the title compound, C14H16N2O2, is located on a crystallographic twofold rotation axis. The central O—C—C—O bridge adopts a gauche conformation. One of the amine H atoms is disordered over two equally occupied positions. The crystal structure is stabilized by N—H⋯O and N—H⋯N hydrogen bonds.
doi:10.1107/S1600536808014736
PMCID: PMC2961458  PMID: 21202633
23.  1,4-Bis(4-amino­phen­oxy)benzene 
The title compound, C18H16N2O2, is a precusor for the synthesis of polyimides. The mol­ecule is located on a crystallographic inversion center and the terminal amino­phen­oxy rings are almost perpendicular to the central benzene ring with a dihedral angle of 85.40 (4)°. The mol­ecular conformation is stabilized by N—H⋯O and N—H⋯N inter­molecular hydrogen-bonding inter­actions.
doi:10.1107/S160053680800367X
PMCID: PMC2960774  PMID: 21201920

Results 1-23 (23)