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The title compound, C26H22N2O4, crystallizes in an anti-C=O orientation, with the two N-substituted benzene rings in different conformations relative to the naphthalene ring. These conformations allow two strong N—H⋯O hydrogen bonds and one C—H⋯π inter­action to generate mol­ecular chains in the cell. [ABSTRACT FROM AUTHOR]

In the cation of the title compound, C(23)H(25)N(4)O(+)·PF(6) (-), the imidazolium ring make dihedral angles of 87.20 (6) and 79.89 (5)° with the pyridine ring and the quinoline system, respectively. In the crystal, C-H⋯F and C-H⋯N hydrogen bonds are observed.

The title silver N-heterocyclic carbene compound, [Ag(C(17)H(16)N(2))(2)]PF(6), crystallizes as a mononuclear salt. The two imidazole rings, which are almost coplanar [maximum deviation from the least squares plane of 0.05 (2) Å], are linked by the Ag atom with a C-Ag-C angle of 178.60 (9)°. In the crystal, C-H⋯F hydrogen bonds, weak π-π inter-actions [centroid-centroid distances = 3.921 (1) and 3.813 (3) Å] and C-H⋯π inter-actions lead to a supermolecular structure.

The title N-heterocyclic carbene compound, C(21)H(22)N(4) (2+)·2PF(6) (-), crystallizes as an inversion twin. There are two independent N-heterocyclic carbene dications (A and B) and four independent hexa-fluoro-phosphate anions in the asymmetric unit. The cations are L-shaped with the benzene rings being inclined to one another by 88.82 (16)° in cation A and 87.03 (16)° in cation B. The imidazole rings make dihedral angles of 35.7 (2) and 32.83 (18)° with the attached benzene rings in cation A, and 30.14 (19) and 31.96 (18)° in cation B. In the crystal, the cations are linked via C-H⋯F hydrogen bonds, forming a three-dimensional network. π-π inter-actions involving the benzene and imidazole rings [centroid-centroid distances = 3.602 (2) and 3.723 (2) Å] and C-H⋯π inter-actions are also present.

The title compound, [Ag(C(27)H(23)BrN(3)O(4))(CH(3)CN)(2)](PF(6))(2), is a mononuclear salt species in which the silver(I) atom is coordinated by one ligand and two acetonitrile mol-ecules and exhibits a distorted T-shaped coordination. The asymmetric unit contains one independent cation and two independent hexa-fluorido-phosphate anions, one of which is disordered over two positions in a 0.756 (11):0.244 (11) ratio. Weak π-π inter-actions between the anthraquinone ring systems [centroid-centroid distance = 3.676 (3) Å], inter-molecular Ag-π inter-actions [Cg⋯Ag = 3.405 Å] and C-H⋯π inter-actions between pairs of adjacent mol-ecules are observed.

In the title salt, C(18)H(19)N(4)O(+)·PF(6) (-), the dihedral angle between the benzimidazolium and benzimidazole ring systems is 16.24 (2)°. In the cation, a π-π inter-action is observed between the imidazolium ring and the benzene ring of the benzimidazole ring system [centroid-centroid distance = 3.5713 (11) Å]. The PF(6) (-) ion is disordered over two sites, with occupancies of 0.895 (2) and 0.105 (2). In the crystal structure, pairs of N-H⋯N hydrogen bonds link the cations, forming centrosymmetric dimers. The dimers are linked via π-π inter-actions [centroid-centroid distance = 3.5606 (11) Å]. In addition, C-H⋯F hydrogen bonds are observed.

In the title compound, C(26)H(18)N(4)O(6), the amide units are approximately coplanar with the benzene ring bonded to the N atom [dihedral angles of 10.59 (10) and 24.00 (12)°], but twisted significantly out of the plane of the benzene ring bonded to the carbonyl C atom [dihedral angles of 57.82 (9) and 58.05 (9)°]. The dihedral angle between the two rings of the biphenyl unit is 77.66 (4)°. Intra-molecular N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions occur. The crystal structure is stabilized by inter-molecular N-H⋯O hydrogen bonds and C-H⋯O contacts.

In the title compound, C(20)H(15)N(2)O(+)·Cl(-), the dihedral angle between the fused-ring system and the benzene ring is 63.10 (7)°. In the crystal, N-H⋯Cl hydrogen bonds link the components and aromatic π-π stacking [shortest centroid-centroid distance = 3.6421 (12) Å] occurs.

The title compound, C(23)H(17)N(3), can be used in coordination chemistry. The anthracene ring makes dihedral angles of 86.08 (5) and 76.63 (6)°, respectively, with the pyridine and pyrazole rings. The dihedral angle between the pyrazole and pyrimidine rings is 11.79 (7)°. In the structure, weak inter-molecular C-H⋯N hydrogen bonds are observed.

In the title compound, C(33)H(25)N(2) (+)·PF(6) (-), the naphthalene ring system is twisted with respect to the anthracene and benzene rings, making dihedral angles of 72.40 (3) and 71.39 (4)°, respectively. The crystal structure is stabilized by intermolecular C-H⋯F hydrogen bonding. Four F atoms of the hexa-fluoro-phosphate anion are disordered over two sets of sites in a 0.645 (4):0.355 (4) ratio.

In the title compound, C(19)H(17)N(3)O, the planes of the aromatic substituents attached to the benzamide moiety are almost perpendicular to one another, making a dihedral angle of 88.16 (7)°. The observed conformation of the mol-ecule is produced by an intra-molecular N-H⋯O hydrogen bond.

The complete mol-ecule of the title compound, C(26)H(20)N(2)O(3), is generated by crystallographic twofold symmetry, with the central O atom lying on the rotation axis. The conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond. The dihedral angle between the inner and outer aromatic ring planes is 61.12 (5)°.

In the title compound, C(28)H(24)N(2)O(4), the dihedral angle between the two rings of the biphenyl unit is 75.34 (9)°. The outer aromatic rings form dihedral angles of 66.96 (1) and 85.69 (8)° with the rings to which they are attached . The mol-ecular structure is stabilized by intra-molecular C-H⋯O and N-H⋯O hydrogen bonds. In the crystal structure, inter-molecular N-H⋯O inter-actions are observed.

The title compound, C(25)H(22)Br(2)O(2), crystallizes with two mol-ecules in the asymmetric unit. In each independent mol-ecule, the two naphthalene ring systems are nearly perpendicular to one another, with dihedral angles of 85.6 (1) and 86.2 (1)°. The crystal structure is stabilized by C-H⋯π inter-actions, and inter- and intra-molecular C-H⋯O and C-H⋯Br hydrogen bonds.