In the title compound, C(12)H(10)N(2)O, the dihedral angle between the pyridine ring system and the phenyl ring is 1.8 (1)°. There is an intra-molecular N-H⋯N hydrogen bond between the pyridine N atom and the amide NH function.

The title compound, C(17)H(16)N(2)O(6), is a decomposition product of the hypertension drug nifedipine [systematic name: dimethyl 2,6-dimethyl-4-(2-nitro-phen-yl)-1,4-dihydro-pyridine-3,5-dicarboxyl-ate]. The dihedral angle between the nitro-sophenyl ring and the pyridine ring is 67.1 (5)°.

In the crystal structure of the title compound, C(28)H(21)Cl(2)N, π-π inter-actions link pairs of mol-ecules into centrosymmetric dimers with a distance of 3.756 (3) Å between the centroids of the pyridine rings. Weak inter-molecular C-H⋯Cl hydrogen bonds further link these dimers into chains propagating along [01]. The pyridine ring forms dihedral angles of 21.52 (1) and 55.87 (2)°, respective...

In the title mol-ecule, C(19)H(23)NO(5), the dihedral angle formed by the benzene ring and the planar part of the dihydro-pyridine ring is 83.52 (5)°. The dihydro-pyridine ring adopts a flattened boat conformation. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds, generating chains running parallel to [100]. The crystal structure is consolidated by C-H⋯O contacts.

In the title compound, C21H21BrClNO4, the dihydro-pyridine ring adopts a flattened boat conformation. The 3-bromo-5-chloro-2-hy-droxy-phenyl ring forms a dihedral angles of 84.44 (7)° with the dihydro-pyridine mean plane. The mol-ecular conformation is stabilized by an intra-molecular O-H⋯O hydrogen bond, with an S(8) ring motif. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds link the mol-ecule...

In the crystal structure of the title compound, C(15)H(11)FN(2), the pyrrole ring makes dihedral angles of 33.19 (9) and 36.33 (10)° with the pyridine and 4-fluoro-phenyl rings, respectively. The pyridine ring makes a dihedral angle of 46.59 (9)° with the 4-fluoro-phenyl ring. In the crystal structure, an N-H⋯N hydrogen bond joins the mol-ecules into chains.

The title compound, C(20)H(14)F(4)N(4), is a flexible bis-pyridine-type ligand with an extended fluorinated spacer group between the two pyridyl functions. The centroid of the central aromatic ring is situated on a crystallographic center of inversion. The dihedral angle between the pyridine ring and the central benzene ring is 63.85 (9)°. The crystal structure exhibits inter-molecular C-H⋯F hy...

In the title compound, C(20)H(21)N(3)O(4), the 1,4-dihydro-pyridine ring adopts a boat conformation. An intra-molecular C-H⋯O hydrogen bond generates an S(6) ring motif. The pyrazole ring makes dihedral angles of 87.81 (7) and 45.09 (7)° with the mean plane of the 1,4-dihydro-pyridine ring and the phenyl ring, respectively. In the crystal, mol-ecules are linked by N-H⋯N, N-H⋯O and C-H⋯O hydroge...

In the mol-ecule of the title compound, C(21)H(14)N(2)O(3), the tetra-hydro-benzo[h]quinoline fused-ring system is buckled owing to the ethyl-ene -CH(2)CH(2)- fragment, the benzene ring and the pyridine ring being twisted by 24.3 (1)°. The ring of the benzodioxol system is bent away from the pyridine ring by 61.4 (1)° in order to avoid crowding the cyanide substituent. Two mol-ecules are linked...

In the title compound, C(24)H(19)N(3)O, the pyrazoline ring adopts an envelope conformation with the C atom linking to the pyridine ring as the flap. The mean plane of the pyrazoline ring makes dihedral angles of 85.54 (4) and 81.66 (3)° with the pyridine ring and the anthracene ring system, respectively. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds. In addition, weak π-π inter...