Cocrystals composed of 4,4'-(fluorene-9,9-di­yl)diphenol and 6-methyl-2H-pyridone

The crystal structures of two cocrystals composed of 4,4'-(fluorene-9,9-di­yl)diphenol (C₂₅H₁₈O₂) and 6-methyl-2H-pyridone (C₆H₇NO) are reported, namely 4,4'-(fluorene-9,9-di­yl)diphenol-6-methyl-2H-pyridone (1/2), C₂₅H₁₈O₂·2C₆H₇NO, (I), and 4,4'-(fluorene-9,9-di­yl)diphenol-6-methyl-2H-pyridone-water (1/3/3), C₂₅H₁₈O₂·3C₆H₇NO·3H₂O, (II). In both cocrystals, the mutual orientation between two 6-methyl-2H-pyridone mol­ecules in principle enables photodimerization, yet in both cases no photodimerization occurs. In cocrystal (I) this is probably due to poor orbital overlap, while in the case of cocrystal (II) it is suggested that the lack of reaction is due to the highly complex hydrogen-bonding network that exists in the structure.

Benzyl N,N-bis­[2-(penta­fluoro­anilino)­ethyl]­carbamate

The title compound, C₂₄H₁₇F₁₀N₃O₂, exhibits intra­molecular N-H...O hydrogen bonding, as well as intra­molecular Ar...Ar^F face-to-face inter­actions. The mol­ecules are linked together by N-H...F-C hydrogen bonds, forming chains parallel to the a axis. Adjacent symmetry-related chains are combined in double zipper-like ribbons by parallel Ar^F...Ar^F offset [pi]-stacking inter­actions.