(2E)-1-Phenyl-2-[1-(2-phenyl­prop-2-en-1-yl)pyrrolidin-2-yl­idene]ethanone

The title compound, C₂₁H₂₁NO, is a vinyl­ogous amide (enaminone) produced by reaction of 1-(2-phenyl­prop-2-en-1-yl)pyrrolidine-2-thione with phenacyl bromide. In the mol­ecule, the phenyl rings are twisted from the mean plane of the pyrrolidine ring by 11.2 (1) and 67.3 (1)°. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules related by translation along the b axis into chains.

2,3-Dihydro-1H-pyrrolo­[1,2-a]indole-9-carbonitrile

The asymmetric unit of the title compound, C₁₂H₁₀N₂, which may serve as a model for mitosenes, contains two independent mol­ecules. The conformation of the five-membered rings in both molecules is envelope, with the central CH₂—CH₂—CH₂ C atom at the flap in each case. In the crystal, they inter­act by a combination of weak C—H...N and π–π inter­actions [centroid–centroid distances = 3.616 (1) and 3.499 (1) Å] and C—H...π contacts.

4-Amino­pyridinium 2-chloro-4-nitro­benzoate monohydrate

In the title hydrated mol­ecular salt, C₅H₇N₂⁺·C₇H₃ClNO₄⁻·H₂O, the ions and water mol­ecules assemble into ribbons of R₆⁵(22) rings along the c axis via O(water)—H...O⁻, N⁺—H...O(water) and N—H...O⁻ hydrogen bonds. N—H...O⁻ hydrogen bonds connect adjacent ribbons along the c-axis direction via R₄⁴(12) rings, forming hydrogen-bonded layers. The CO₂ and NO₂ groups make dihedral angles of 81.8 (2) and 1.4 (2)°, respectively, with the ring in the anion.