(1E,4E)-1,5-Bis[2-(trifluoro­meth­yl)phen­yl]penta-1,4-dien-3-one

In the title compound, C₁₉H₁₂F₆O, a monoketone derivative of curcumin, both double bonds have a trans conformation. The mol­ecule is mostly planar with all C and O atoms essentially coplanar, with the exception of one benzene ring, which is tilted by 17.18 (1)° with respect to the plane of the remainder of the mol­ecule. The r.m.s. deviation from planarity of the coplanar section is 0.0097 Å. The crystal packing features weak C—H...O and C—H...F inter­actions.

2,4,6,8-Tetra­kis(2-fluoro­phen­yl)-3,7-diaza­bicyclo­[3.3.1]nonan-9-one

The title compound, C₃₁H₂₄F₄N₂O, exists in a chair–boat conformation with an equatorial orientation of the 2-fluoro­phenyl groups on both sides of the secondary amino group of the chair form. The benzene rings in the `chair' part are inclined to each other at 19.4 (1)°, while the equivalent angle between the benzene rings in the `boat' part is 75.6 (1)°. One F atom was treated as disordered over two positions in a 0.838 (4):0.162 (4) ratio. In the crystal, N—H...O hydrogen bonds link the mol­ecules into chains along [001] and these chains are held together via weak N—H...F and C—H...F inter­actions.

μ-(2,6-Bis{[3-(di­methyl­amino)­prop­yl]imino­meth­yl}-4-methyl­phenolato)-μ-hydroxido-bis­[(thio­cyanato-κN)copper(II)]

In the title compound, [Cu₂(C₁₉H₃₁N₄O)(OH)(NCS)₂], the mol­ecular structure of the dinuclear complex reveals two penta­coordinated Cu^II ions, which are bridged by the phenolate O atom of the ligand and by an exogenous hydroxide ion. The bridging atoms occupy equatorial positions in the coordination sphere of the metal atoms and complete the equatorial coordination planes with two ligand N atoms, the apical positions being occupied by thio­cyanate N atoms. The crystal structure also features π–π stacking inter­actions involving the benzene rings with a centroid–centroid distance of 3.764 (4)Å. The crystal studied was a non-merohedral twin, with a refined BASF value of 0.203 (2)

1,3-Bis(2-methyl­prop-2-eno­yl)-1H-benz­imidazol-2(3H)-one

The mol­ecules of the title compound, C₁₅H₁₄N₂O₃, possesses crystallographically imposed twofold rotational symmetry, so the asymmetric unit contains one half-mol­ecule. The fused-ring system deviates significantly from planarity; the planes of the five- and six-membered rings are twisted with respect to each other by 3.0 (1)°. In the crystal, weak C—H...O hydrogen bonds link mol­ecules related by translation in [010] into chains.

Ethyl 2-amino-4-(4-methyl-1,3-thia­zol-5-yl)-5-oxo-4H,5H-pyrano[3,2-c]chromene-3-carboxyl­ate

There are two independent mol­ecules in the asymmetric unit of the title compound, C₁₉H₁₆N₂O₅S, in which the thia­zole rings make dihedral angles of 80.89 (11) and 84.81 (11)° with the pyrano[3,2-c]chromene ring systems. An intra­molecular N—H...O hydrogen bond involving the amino group occurs in each independent mol­ecule. In the crystal, the amino groups are involved in N—H...O and N—H...N hydrogen bonds.

2,2′-{[(1E,1′E)-(Cyclo­hexane-1,4-diyl)­bis(aza­nylyl­idene)]bis­(ethan-1-yl-1-yl­idene)}diphenol

The title compound, C₂₂H₂₆N₂O₂, crystallizes with three independent mol­ecules, two of which are situated on inversion centers, so the asymmetric unit contains two independent half-mol­ecules and one mol­ecule in a general position. The two hy­droxy groups in each mol­ecule are involved in intra­molecular O—H...N hydrogen bonds, which generate S(6) rings. In the crystal, weak inter­molecular C—H...π inter­actions link the mol­ecules into two crystallographically independent columns propagating along [001]; one column consists of mol­ecules in general positions, while the other column is built from alternating independent centrosymmetric mol­ecules.

2-[(E)-2-(4-Meth­oxy­phen­yl)ethen­yl]-1-methyl­pyridinium iodide

In the title mol­ecular salt, C₁₆H₁₀NO⁺·I⁻, the dihedral angle between the pyridinium and benzene rings is 6.61 (8)°. In the crystal, the cation is linked to the anion by a C—H...I inter­action arising from the activated aromatic C atom adjacent to the N⁺ cation.