research papers
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(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-HN and C-HO hydrogen bonds to form complex sheets and with the solvent molecules attached at the outer faces by O-HO hydrogen bonds.
research papers
In four halogenated N,2-diarylacetamides, two are isostructural in the space group P, with molecules linked into chains of rings by a combination of N-HO and C-H(arene) hydrogen bonds. Molecules of the other two acetamides are linked into simple C(4) chains by N-HO hydrogen bonds, but significant C-H(arene) interactions are absent.