research papers
(2E)-3-(6-Methoxynaphthalen-2-yl)-1-(pyridin-3-yl)prop-2-en-1-one forms sheets built from C-HO and C-H hydrogen bonds, and the product of its cyclocondensation with guanidine, (4RS)-2-amino-4-(6-methoxynaphthalen-2-yl)-6-(pyridin-3-yl)-3,4-dihydropyrimidine monohydrate, forms sheets built from N-HO, O-HN and N-HN hydrogen bonds.
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.
research papers
Four imidazo[2,1-b][1,3,4]thiadiazoles display similar molecular constitutions and exhibit a wide variety of supramolecular structures. The molecular skeletons are all nearly planar. Two of the structures exhibit C-HN hydrogen bonding, forming ribbons in one and dimers in the other, while hydrogen bonding is absent in the remaining two structures.
research papers
Three highly substituted cyclohexanols were prepared in satisfactory yield and with good stereospecificity by reaction of 4-halogenobenzaldehydes with 2-acetylpyridine under mild conditions. The molecular structures of the cyclohexanols are very similar, but the crystal structures, particularly the space groups and the supramolecular assemblies, are all different.