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The reaction of (2RS,3SR)-2,3-di­bromo-1,3-bis­(4-fluoro­phenyl)propan-1-one with phenylhydrazine gave a pyrazole exhibiting some aromatic-type delocalization in the pyrazole ring and with mol­ecules that are linked into simple chains by a single C-H...[pi](arene) hydrogen bond. The same reaction with 4-hy­droxy­benzo­hydrazide instead of phenylhydrazine gave a solvated oxa­diazine, with the oxa­diazine mol­ecules linked by a combination of N-H...N and C-H...O hydrogen bonds to form complex sheets and with the solvent mol­ecules attached at the outer faces by O-H...O hydrogen bonds.

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In four halogenated N,2-diaryl­acetamides, two are isostructural in the space group P\overline{1}, with mol­ecules linked into chains of rings by a combination of N-H...O and C-H...[pi](arene) hydrogen bonds. Mol­ecules of the other two acetamides are linked into simple C(4) chains by N-H...O hydrogen bonds, but significant C-H...[pi](arene) inter­actions are absent.
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