6-Chloro-2-cyclo-propyl-4-(trifluoro-meth-yl)quinoline.

In the title compound, C(13)H(9)ClF(3)N, the quinoline ring system makes a dihedral angle of 88.8 (2)° with the cyclo-propyl ring.

Bis[N,N-dimethyl-1-(10H-pyrido[3,2-b][1,4]benzothia-zin-10-yl)propan-2-aminium] tetrakis-(thio-cyanato-κN)cobaltate(II).

The asymmetric unit of the title salt, (C(16)H(20)N(3)S)(2)[Co(NCS)(4)], comprises one monovalent isothio-pendylium cation and one-half of a divalent thio-cyanatocobaltate(II) anion (2 symmetry). The central thia-zine 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) Šfor the N and S atoms. The mol-ecular structure of the cation is stabilized by an intra-molecular N-H⋯N hydrogen bond. Within the complex anion, the Co(II) atom is tetra-hedrally surrounded by four N atoms of the thio-cyanate ligands. π-π stacking, with a distance of 3.7615 (10) Šbetween the centroids of benzene and pyridine rings, helps to consolidate the packing.

3,4-Dimeth-oxy-benzaldehyde [2,8-bis-(trifluoro-meth-yl)quinolin-4-yl]hydrazone.

In the title compound, C(20)H(15)F(6)N(3)O(2), 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 inter-molecular C-H⋯F hydrogen bond. In addition, a weak π-π inter-action is observed between the unfused benzene ring and the benzene ring of quinoline, with a centroid-centroid distance of 3.586 (1) Å.

Nicotinaldehyde [2,8-bis-(trifluoro-meth-yl)quinolin-4-yl]hydrazone monohydrate.

In the title compound, C(17)H(10)F(6)N(4)·H(2)O, 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 trifluoro-methyl group is disordered over two orientations with occupancies of 0.70 (1) and 0.30 (1). The water mol-ecule is disordered over two positions with occupancies of 0.76 (1) and 0.24 (1). In the crystal, the water mol-ecule is linked to the main mol-ecule 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 inter-action is observed between the pyridine ring and the pyridine ring of the quinoline unit, with a centroid-centroid distance of 3.650 (2) Å.