In the title compound, C16H17NO4S2, the 2H-chromene ring system is nearly planar, with a maximum deviation of 0.070 (1) Å, and the morpholine ring adopts a chair conformation; the bond-angle sum for its N atom is 357.9°. The dihedral angle between the the 2H-chromene ring and the best plane through the morpholine ring is 89.09 (6)°. An intra­molecular C—H⋯S hydrogen bond occurs. In the crystal, C—H⋯O hydrogen bonds generate R 2 2(8) rings and π–π inter­actions occur between fused benzene rings of the chromene system [shortest centroid–centroid distance = 3.5487 (8) Å].

In the title compound, C20H15F6N3O2, the quinoline ring system is almost coplanar with the benzene ring; the dihedral angle between the two planes is 2.31 (8)°. The crystal structure displays an inter­molecular C—H⋯F hydrogen bond. In addition, a weak π–π inter­action is observed between the unfused benzene ring and the benzene ring of quinoline, with a centroid–centroid distance of 3.586 (1) Å.

In the title compound, C17H10F6N4·H2O, the pyridine ring is not coplanar with the quinoline ring system; the dihedral angle between the two planes is 21.3 (1)°. One of the trifluoro­methyl group is disordered over two orientations with occupancies of 0.70 (1) and 0.30 (1). The water mol­ecule is disordered over two positions with occupancies of 0.76 (1) and 0.24 (1). In the crystal, the water mol­ecule is linked to the main mol­ecule via N—H⋯O and C—H⋯O hydrogen bonds, and inversion-related pairs are linked via O—H⋯N hydrogen bonds. In addition, a weak π–π inter­action is observed between the pyridine ring and the pyridine ring of the quinoline unit, with a centroid–centroid distance of 3.650 (2) Å.

The asymmetric unit of the title salt, (C16H20N3S)2[Co(NCS)4], comprises one monovalent isothio­pendylium cation and one-half of a divalent thio­cyanatocobaltate(II) anion (2 symmetry). The central thia­zine ring of the cation is slightly twisted in a boat-like fashion, with r.m.s. deviations from the mean plane of 0.272 (1) and 0.2852 (8) Å for the N and S atoms. The mol­ecular structure of the cation is stabilized by an intra­molecular N—H⋯N hydrogen bond. Within the complex anion, the CoII atom is tetra­hedrally surrounded by four N atoms of the thio­cyanate ligands. π–π stacking, with a distance of 3.7615 (10) Å between the centroids of benzene and pyridine rings, helps to consolidate the packing.

In the title compound, C13H9ClF3N, the quinoline ring system makes a dihedral angle of 88.8 (2)° with the cyclo­propyl ring.