6-Chloro-N-(pyridin-4-ylmeth-yl)pyridine-3-sulfonamide.

In the title sulfonamide derivative, C11H10ClN3O2S, the dihedral angle between the pyridine rings is 46.85 (12)°. The N atom of the chloro-pyridine ring is anti to the N-H bond.

N'-Hy-droxy-pyridine-2-carboximidamide.

The title mol-ecule, C6H7N3O, is almost planar (r.m.s.

4-(4-Methyl-phenyl-sulfon-yl)piperazin-1-ium tri-fluoro-acetate.

In the title salt, C11H17N2O2S(+)·CF3COO(-), the cation is protonated at the secondary piperazine N atom. The dihedral angle between the benzene ring and the piperazine mean plane is 85.54 (10)°.

4-(Dec-yloxy)phenyl 2-oxo-7-trifluoro-methyl-2H-chromene-3-carboxyl-ate.

The title compound, C27H29F3O5, is a liquid crystal (LC) and exhibits enanti-otropic SmA phase transitions. In the crystal, the dihedral angle between the 2H-chromene ring system and the benzene ring is 62.97 (2)°.