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. Key indicators: single-crystal X-ray study; T = 173 K; mean σ(C–C) = 0.002 A° ; R factor = 0.040; wR factor = 0.118; data-to-parameter ratio = 12.8

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

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

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

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

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)

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

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

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)

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)°]