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There are two independent mol-ecules in the asymmetric unit of the title compound, C(11)H(9)Cl(2)N, both of which are essentially planar [maximum deviations of 0.072 (5) and 0.072 (7) Å]. In the crystal structure, weak π-π stacking inter-actions [centroid-centroid distances = 3.791 (3) Å and 3.855 (3) Å] link pairs of mol-ecules.

In the title compound, C(19)H(16)ClNO(2), the quinoline ring system is planar (r.m.s. deviation = 0.008 Å). The phenyl group and the -CO(2) fragment of the ester unit form dihedral angles of 60.0 (1) and 60.5 (1)°, respectively, with the quinoline ring system.

The quinoline fused-ring system of the title compound, C(11)H(8)ClNO, is planar (r.m.s. deviation = 0.005 Å); the formyl group is slightly bent out of the plane [C-C-C-O1 torsion angles = 8.8 (7) and -172.8 (4)°].

In the title compound, C(11)H(8)ClNO(2), the quinoline fused-ring system is almost planar (r.m.s. deviation = 0.020 Å). The formyl group is slightly bent out of the quinoline plane [deviation of the O atom = 0.371 (2) Å].

The quinoline fused-ring system of the title compound, C(11)H(8)ClNO, is planar (r.m.s. deviation = 0.007 Å); the formyl group is bent slightly out of the plane [C-C-C-O torsion angles = -9.6 (5) and 170.4 (3)°].

The quinoline fused-ring system of the title compound, C(11)H(8)ClNO(2), is planar (r.m.s. deviation = 0.0095 Å); the formyl group is slightly bent out of this plane [C-C-C-O torsion angles = -2.4 (3) and 175.9 (2)°].

The benzo[h]quinolinyl fused-ring of the title compound, C(14)H(8)ClNO, is planar (r.m.s. deviation = 0.016 Å); the formyl group is slightly bent out of the plane [the C-C-C-O torsion angle is 10.7 (4)°].

All the non-H atoms of the title compound, C(12)H(10)ClNO, lie on a crystallographic mirror plane orientated perpendicular to the crystallographic b axis.

The quinolinyl fused-ring of the title compound, C(11)H(8)ClNO, is almost planar (r.m.s. deviation = 0.013 Å); the formyl group is slightly bent out of the plane of the fused ring system [C-C-C-O torsion angle = 13.5 (4)°].

The quinolinyl fused ring system of the title compound, C(10)H(6)ClNO, is planar (r.m.s. deviation = 0.018 Å); the formyl group is slightly bent out of the plane of the fused ring system [C-C-C-O torsion angle = 8.2 (3)°].

In the title compound, C(19)H(16)ClNO(2), the dihedral angle between the plane of the phenyl substituent and 3-acetyl-quinoline unit is 75.44 (5)°. The crystal structure is stabilized by inter-molecular C-H⋯O hydrogen bonds.

In the title mol-ecule, C(13)H(15)N(3)O(2), the dihedral angle between the mean plane of the 1,3-dioxolane group and the 2-hydrazino-7-methyl-isoquinoline unit is 85.21 (5)°. The conformation of the mol-ecule is influenced by bifurcated N-H⋯(O,O) and N-H⋯N intra-molecular hydrogen bonds. In the crystal structure, mol-ecules are linked via inter-molecular N-H⋯O hydrogen bonds, forming extended chains along [001].

The title compound, C(10)H(7)Cl(2)NO, features a planar mol-ecule, excluding the methyl H atoms [maximum deviation = 0.0385 (1) Å]. The crystal packing is stabilized by π-π stacking inter-actions across inversion centres [centroid-to-centroid distance = 3.736 (3) Å].

The title compound, C(15)H(11)NO, consists of a planar isoquinolinone group to which a phenyl ring is attached in a twisted fashion [dihedral angle = 39.44 (4)°]. The crystal packing is dominated by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds which define centrosymmetric dimeric entitities.

The title compound, C(23)H(16)ClNOS, exhibits dihedral angles of 11.73 (1) and 66.07 (1)°, respectively, between the mean plane of the isoquinoline system and the attached phenyl ring, and between the isoquinoline system and the chloro-phenyl ring. The dihedral angle between the phenyl and chlorophenyl rings is 54.66 (1)°.

The complete molecule of the title compound, C(30)H(20)N(2)Se(2), is generated by a crystallographic inversion centre at the mid-point of the Se-Se bond. The dihedral angle between the isoquinoline-1-selenol group and the phenyl ring is 14.92 (2)°. The herringbone-like packing of the structure is supported by inter-molecular π-π stacking inter-actions with a shortest perpendicular distance between isoquinoline groups of 3.514 Å; the slippage between these ring systems is 0.972 Å, and the distance between the centroids of the six-membered carbon rings is 3.645 (3) Å.