ABSTRACT: In the title compound, C18H18O6, the biphenyl moiety is twisted with a dihedral angle of 29.11?(10)°. The carbometh-oxy groups form C-C-C-O torsion angles of -18.3?(3) and -27.7?(3)° with the attached rings, as a result of steric hindrances from the nearby meth-oxy groups. In the absence of stacking inter-actions and with no H?O contacts shorter than 2.7?Å, the packing is dominated by weaker van der Waals inter-actions.
Project description:In the title compound, C18H18O6, the benzene rings are coplanar due to the centrosymmetric nature of the mol-ecule, with an inversion centre located at the midpoint of the C-C bond between the two rings. Consequently, the methyl carboxyl-ate substituents are oriented in a trans fashion with regards to the bond between the benzene rings. The methyl carboxyl-ate and meth-oxy substituents are rotated slightly out of plane relative to their parent benzene rings, with dihedral and torsion angles of 18.52?(8) and -5.22?(15)°, respectively. The shortest O?H contact between neighbouring mol-ecules is about 2.5?Å. Although some structure-directing contributions from C-H?O hydrogen-bonding inter-actions are possible, the crystal packing seems primarily directed by weak van der Waals forces.
Project description:In the title mol-ecule, C(28)H(18)O(10), the two central benzene rings form a dihedral angle of 31.0?(1)°. In the phthalic acid fragments, the carb-oxy groups in the meta positions are approximately coplanar with the attached benzene rings, being inclined to their planes at 2.7?(1) and 10.3?(1)°, while the carb-oxy groups in the ortho positions are twisted from the benzene ring planes by 83.5?(1) and 75.4?(1)°. In the crystal, O-H?O hydrogen bonds link the mol-ecules into layers parallel to the bc plane. Weak C-H?O hydrogen bonds and ?-? inter-actions between the aromatic rings [centroid-centroid distance = 3.7674?(3)?Å] further consolidate the crystal packing.
Project description:In the title compound, C(12)H(12)Cl(2)N(2) (2+)·SO(4) (2-), the two rings are not coplanar [dihedral angle = 48.7?(2)°]. In the crystal, multiple N-H?O hydrogen-bond inter-actions are found between the ammonium and sulfate groups.
Project description:The whole mol-ecule of the title compound, C22H28Br2O2, is generated by twofold rotation symmetry. The dihedral angle of the biphenyl moiety is 85.05?(11)°. The hy-droxy groups show intra-molecular O-H?? inter-actions without any other hydrogen-bond acceptors. In the crystal, there are no other significant inter-molecular inter-actions present.
Project description:The title compound, C16H12N2O8, exhibits two near-planar aromatic ester groups with ar-yl-ester dihedral angles of 2.1?(2) and 4.2?(3)°. The dihedral angle between the aromatic rings is 58.0?(1)°. The two nitro groups are tilted slightly from the plane of the aromatic rings, making dihedral angles of 14.1?(1) and 8.2?(2)°. In the crystal, mol-ecules are connected by weak C-H?O inter-actions, forming a three-dimensional network.
Project description:The crystal structures of two hydrogen-bonded compounds, namely 4-meth-oxy-benzoic acid-1,3-bis-(pyridin-4-yl)propane (2/1), C13H14.59N2·C8H7.67O3·C8H7.74O3, (I), and biphenyl-4,4'-di-carb-oxy-lic acid-4-meth-oxy-pyridine (1/2), C14H9.43O4·C6H7.32NO·C6H7.25NO, (II), have been determined at 93?K. In (I), the asymmetric unit consists of two crystallographically independent 4-meth-oxy-benzoic acid mol-ecules and one 1,3-bis-(pyridin-4-yl)propane mol-ecule. The asymmetric unit of (II) comprises one biphenyl-4,4'-di-carb-oxy-lic acid mol-ecule and two independent 4-meth-oxy-pyridine mol-ecules. In each crystal, the acid and base mol-ecules are linked by short O-H?N/N-H?O hydrogen bonds, in which H atoms are disordered over the acid O-atom and base N-atom sites, forming a linear hydrogen-bonded 2:1 or 1:2 unit of the acid and the base. The 2:1 units of (I) are linked via C-H??, ?-? and C-H?O inter-actions into a tape structure along , while the 1:2 units of (II) form a double-chain structure along [-101] through ?-? and C-H?O inter-actions.
Project description:The title compound, C(22)H(28)Br(2)O(2), crystallizes in a staggered arrangement to minimize the inter-actions of its ortho substituents, with a dihedral angle of 84.2?(3)° between the two aromatic rings. Short C-H?O hydrogen-bonding inter-actions between meth-oxy groups result in a one-dimensional polymeric chain of mol-ecules lying parallel to the b axis. One tert-butyl group is disordered equally over two positions.
Project description:The title compound, C16H15NO4, exhibits two near-planar aromatic ester groups with a maximum aryl-ester torsion angle of 1.9?(2)°. The dihedral angle between the benzene rings is 44.7?(1)°. In the crystal, N-H?O hydrogen bonding is observed along with C-H?O contacts, forming chanins along . No ?-? inter-actions were noted between the benzene rings.
Project description:The title compound, C(12)H(14)N(4), has a crystallographically imposed centre of symmetry. Inter-molecular N-H?N hydrogen bonds between amino groups link adjacent mol-ecules into a three-dimensional network where ten-membered hydrogen-bonded rings are observed.
Project description:The title compound, C16H13NO6, exhibits a biphenyl unit with a dihedral angle between the two aryl rings of 56.01?(5)°. The two ester groups vary slightly from planarity, with ar-yl-ester dihedral angles of 4.57?(5) and 16.73?(5)°. The nitro group is turned from the aromatic unit with an ar-yl-nitro dihedral angle of 48.66?(4)°. In the crystal, mol-ecules are connected by weak C-H?O inter-actions, forming a three-dimensional network.