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In the title compound, [Zn(NCS)2(C24H22N4O)]·C3H7NO, the ZnII cation is N,N′,N′′-chelated by one 2-({4-[2,6-bis­(pyridin-2-yl)pyridin-4-yl]phen­yl}(meth­yl)amino)­ethanol ligand and coordinated by two thio­cyanate anions in a distorted N5 trigonal–bipyramidal geometry. In the mol­ecule, the three pyridine rings are approximately coplanar [maximum deviation = 0.026 (5) Å], and the mean plane of the three pyridine rings is twisted to the benzene ring with a small dihedral angle of 5.9 (2)°. In the crystal, complex mol­ecules are linked by weak C—H...O hydrogen bonds into supra­molecular chains propagated along [110]; π–π stacking is observed between adjacent chains [centroid–centroid distance = 3.678 (4) Å]. The di­methyl­formamide solvent mol­ecules are linked with the complex chains via weak C—H...O hydrogen bonds.

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In the title hydrated zwitterion, C11H13NO3S2·H2O, the N—C—C—C and C—C—C—S torsion angles in the side-chain are 171.06 (14) and 173.73 (12)°, respectively. In the crystal, inversion-related mol­ecules are π-stacked with an inter­planar separation of 3.3847 (2) Å. O—H...O hydrogen bonds link inversion-related mol­ecules with a pair of water mol­ecules to form R42(8) rings. The closest S...S contact is 3.4051 (15) Å between inversion-related mol­ecules.

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In the title compound, C21H23NO2, the hexyl group adopts an extended conformation, the six C atoms are nearly coplanar [maximum deviation = 0.082 (3) Å] and their mean plane is approximately perpendicular to the carbazole ring system, with a dihedral angle of 78.91 (15)°. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, forming inversion dimers; π–π stacking between carbazole ring systems of adjacent dimers further links the dimers into supra­molecular chains propagating along the b-axis direction [centroid-to-centroid distances = 3.868 (2) and 3.929 (2) Å].
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