ABSTRACT
The asymmetric unit of the title compound, C27H20O3, contains two independent mol-ecules (A and B). The anthracene ring system is connected to the 2,7-di-meth-oxy-naphthalene core in a twisted manner, with dihedral angles of 86.38â (5) and 79.36â (8)°, respectively, for conformers A and B. In the crystal, face-to-face type dimeric mol-ecular aggregates of each conformer are observed. The dimer of conformer A is formed by two pairs of C-Hâ¯π inter-actions, and that of conformer B by a pair of (sp2)C-Hâ¯O hydrogen bonds. The dimers of conformer A are linked to each other via a π-π stacking inter-action between the anthracene rings to form a chain along the b axis and the chains are aligned along the c axis, forming a sheet structure. The dimers of conformer B are connected to each other via a couple of C-Hâ¯π inter-actions to form a chain along the b axis. The chains are aligned along the c axis through (sp2)C-Hâ¯O=C hydrogen bonds, forming a sheet parallel to the bc plane. The sheets of conformers A and B are alternately stacked along the a axis via two kinds of inter-molecular (sp2)C-Hâ¯O=C hydrogen bonds.
ABSTRACT
The asymmetric unit of the compound, C19H15FO3, contains two independent molecules. Each molecule has essentially the same feature of non-coplanarly accumulated aromatic rings whereby the aroyl group at the 1-position of the naphthalene ring system is twisted almost perpendicularly to the ring system [dihedral angles of 86.52â (8) and 89.66â (8)°]. In the crystal structure, mol-ecules of the same conformer are stacked into columns parallel to the a axis by van der Waals inter-actions only.
ABSTRACT
The asymmetric unit of the title compound, C23H18O3, contains two independent mol-ecules (A and B). Each mol-ecule has essentially the same conformation (r.m.s. deviation of fitted mol-ecules = 0.173â Å) with the aromatic rings twisted in a near perpendicular manner. The dihedral angles between the two naphthalene ring systems are 79.07â (4) and 88.19â (4)° in the two independent mol-ecules. In the crystal, the A mol-ecules are connected by C-Hâ¯O inter-actions, forming chains along the b-axis direction. Further C-Hâ¯O inter-actions between the H atoms of the meth-oxy group and the O atoms of the carbonyl units link the A and B mol-ecules, forming a three-dimensional network.
ABSTRACT
In the title compound, C36H28O4, the 1-naphthoyl groups at the 1- and 8-positions of the central 2,7-dieth-oxy-naphthalene ring system are aligned almost anti-parallel and make a dihedral angle of 76.59â (4)°. The dihedral angles between the central 2,7-dieth-oxy-naphthalene ring system and the terminal naphthalene ring systems are 86.48â (4) and 83.97â (4)°. In the crystal, C-Hâ¯π inter-actions between the central naphthalene ring systems and the naphthoyl groups are observed along the a axis, with the mol-ecules forming a columnar structure. The columns are linked into chains parallel to the b axis by C-Hâ¯O inter-actions.
ABSTRACT
In the title compound, C28H24O4, the benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, and the benzene rings make a dihedral angle of 20.03â (7)°. The dihedral angles between the benzene rings and the naphthalene ring system are 68.42â (5) and 71.69â (5)°. In the crystal, adjacent mol-ecules are linked via C-Hâ¯O hydrogen bonds, forming chains propagating along [100].
ABSTRACT
In the title compound, C36H28O4, the two 2-naphthoyl groups at the 1- and 8-positions of the central 2,7-dieth-oxy-naphthalene ring system are aligned almost anti-parallel and make a dihedral angle of 48.35â (5)°. The dihedral angles between the central 2,7-dieth-oxy-naphthalene ring system and the terminal naphthalene ring systems are 77.64â (4) and 73.73â (4)°. In the crystal, mol-ecules are linked into chains along the a-axis direction by dual C-Hâ¯O inter-actions between naphthoyl groups.
ABSTRACT
In the title compound, C(23)H(18)O(3), the dihedral angle between the two naphthalene ring systems is 78.02â (3)°. The bridging carbonyl C-C(=O)-C plane makes a dihedral angle of 70.56â (5)° with the naphthalene ring system in the 2,7-dimeth-oxy-naphthalene moiety and a dihedral angle of 11.53â (5)° with the naphthalene ring system in the naphthoyl group. In the crystal, adjacent mol-ecules are linked via C-Hâ¯π inter-actions, forming chains along [010].
ABSTRACT
In the title mol-ecule, C(23)H(18)O(3), the dihedral angle between the two naphthalene ring systems is 80.44â (4)°. The mean plane of the bridging carbonyl C-C(=O)-C group makes a torsion angle of -68.55â (17)° with the naphthalene system of the 2,7-dimeth-oxy-naphthalene unit and a torsion angle of -9.01â (19)° with the naphthalene ring system of the naphthoyl group. In the crystal, a weak C-Hâ¯O hydrogen bond occurs between the carbonyl O atom and an H atom of the naphthalene ring in the 2,7-dimeth-oxy-naphthalene unit of a symmetry-related mol-ecule.
ABSTRACT
The mol-ecule of the title compound, C(34)H(24)O(4), possesses crystallographically imposed twofold C(2) symmetry. The two 2-naphthoyl groups at the 1- and 8-positions of the central naphthalene ring are aligned almost anti-parallel [5.21â (5)°]. The dihedral angle between the central 2,7-dimeth-oxy-naphthalene unit and the terminal naphthyl groups is 75.13â (4)°. In the crystal, weak C-Hâ¯O hydrogen bonds and π-π stacking inter-actions [centroid-centroid and inter-planar distances are 3.6486â (8) and 3.3734â (5)â Å, respectively] are observed.
ABSTRACT
In the title compound, C(19)H(15)BrO(3), the dihedral angle between the naphthalene ring system and the benzene ring is 72.02â (9)°. The bridging carbonyl C-C(=O)-C plane makes dihedral angles of 70.88â (10) and 1.87â (12)°, respectively, with the naphthalene ring system and the benzene ring. In the crystal, two types of weak inter-molecular C-Hâ¯O inter-actions and a short Brâ¯C contact [3.345â (2)â Å] are observed.