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N-(3,4,5-Tri­meth­oxy­benzyl­idene)naphthalen-1-amine forms simple hydrogen-bonded sheets built from C-H...O hydrogen bonds, linked by [pi]-[pi] stacking inter­actions, and its reduction product forms complex sheets built from N-H...O, C-H...O and C-H...[pi](arene) hydrogen bonds.

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The reaction of a chloro­pyrazole­carbaldehyde with phenyl­hydrazine proceeds via a simple condensation rather than substitution or cyclo­condensation. The resulting compound forms hydrogen-bonded chains, which are linked into sheets by [pi]-[pi] stacking inter­actions.

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In three 5-acetyl-11-ethyl-6,11-di­hydro-5H-dibenzo[b,e]azepine-6-carb­oxy­lic acids, which differ only in the presence of zero, one or two methyl substituents in one of the aryl rings, the hydrogen-bonded supra­molecular aggregation is, respectively, two-, one- and three-dimensional.

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Four related compounds exemplify the reaction sequence from a 1,4-ep­oxy­benzazepine ester via its reduction product, a benzazepin-4-ol ester, and the corresponding hy­droxy carb­oxy­lic acid, to a lactone as formed by intra­molecular condensation.

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Coordination polymer chains built from CuII and adipate ions are linked into a framework structure by hydrogen bonds and [pi]-[pi] stacking inter­actions involving 2,2'-bi­pyridine and 1,1,3,3-tetra­cyano-2-eth­oxy­propenide components.

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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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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-H...N hydrogen bonding, forming ribbons in one and dimers in the other, while hydrogen bonding is absent in the remaining two structures.
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