(E)-2-Hy­droxy-4-meth­oxy-3-(3-methyl­but-2-en­yl)-6-styryl­benzoic acid

The title compound, C₂₁H₂₂O₄, also known as cajanine, features an intra­molecular O—H...O hydrogen bond between the adjacent carb­oxy and hy­droxy groups. The benzene rings make an inter­planar angle of 175.4 (2)°. In the crystal, mol­ecules are linked by pairs of O—H...O hydrogen bonds, forming inversion dimers.

5,17-Diformyl-25,26,27,28-tetra­propoxy­calix[4]arene

The title compound, C₄₂H₄₈O₆, was obtained via formyl­ation of 25,26,27,28-tetra­propoxycalix[4]arene with dichloro­methyl methyl ether and tin tetra­chloride. It adopts a pinched cone conformation, which leads to an open cavity. The two opposite aromatic rings bearing formyl groups are almost parallel, making a dihedral angle of 29.1 (2)°. The other pair of opposite rings are close to being perpendicular, making a dihedral angle of 73.6 (1)°. Adjacent rings are almost perpendicular, making dihedral angles of 78.8 (2), 81.6 (1), 78.2 (1) and 74.7 (1)°.

N-(2,6-Dimeth­oxy­pyridin-3-yl)-9-methyl-9H-carbazole-3-sulfonamide

In the title compound, C₂₀H₁₉N₃O₄S, a novel tubulin ligand active against human cancer, the dihedral angle between the pyridine ring and the carbazole ring system is 42.87 (10)°. In the crystal, the mol­ecules are held together by N—H...O and C—H...O hydrogen bonds into layers, which are assembled into a three-dimensional network via π–π stacking inter­actions between inversion-related pyridine rings, with centroid–centroid distances of 3.5101 (12) Å.

[1,1′-Bis(di­phenyl­phosphan­yl)cobalto­cenium-κ²P,P′](η⁵-cyclo­penta­dien­yl){2-[4-(4-ethynylphen­yl)phen­yl]ethynyl-κC}ruthenium(II) hexa­fluorido­phosphate

In the title compound, [CoRu(C₅H₅)(C₁₆H₉)(C₁₇H₁₄P)₂]PF₆, the Ru^II atom is coordinated by a cyclo­penta­dienyl ring in an η⁵-mode, one C atom from a 4,4′-diethynyl-1,1′-biphenyl ligand and two P atoms from a chelating 1,1′-bis­(di­phenyl­phosphan­yl)cobaltocenium ligand, giving a three-legged piano-stool geometry. In the crystal, weak C—H...F hydrogen bonds link the complex cations and hexa­fluorido­phosphate anions into a three-dimensional supra­molecular structure.

(E,E,E)-1,6-Bis(4-chloro­phen­yl)hexa-1,3,5-triene

The title mol­ecule, C₁₈H₁₄Cl₂, lies about an inversion centre. The hexa­triene chain is planar with a maximum deviation of 0.0001 (17) Å. The torsion angle of the single bond between the chain and the benzene ring is -168.49 (17)°. In the crystal, the shortest inter­molecular distance between the Cl atoms is 4.0785 (11) Å.

5-Bromo-2-hy­droxy­benzaldehyde 4-ethyl­thio­semicarbazone

In the title Schiff base compound, C₁₀H₁₂BrN₃OS, the C-N-N-C torsion angle is 172.07 (11)°. An intra­molecular hydrogen bond exists between the hy­droxy H atom and the azomethine N atom. In the crystal, pairs of hydrogen bonds involving the imino H atom and the S atom give rise to supra­molecular dimers.

10-{4-[(2-Hy­droxy­benzyl­idene)amino]­phen­yl}-5,5-di­fluoro-1,3,7,9-tetra­methyl-5H-di­pyrrolo­[1,2-c:2′,1′-f][1,3,2]di­aza­borinin-4-ium-5-uide

The title compound, C₂₆H₂₄BF₂N₃O, comprises a boron–dipyrromethene (BODIPY) framework and a phenolic Schiff base substituent group. The BODIPY unit is close to planar [maximum deviation from the least-squares plane = 0.040 (3) Å], and forms a dihedral angle of 80.38 (13)° with the meso-substituent phenyl ring and an angle of 56.57 (13)° with the phenolic ring in the extended substituent chain. An intra­molecular O—H...N hydrogen bond is formed between the phenolic hydroxyl group and the Schiff base N-atom. The crystal studied was a non-merohedral twin with a BASF factor of 0.447 (3) for the two components.