(5RS)-5-(4-Meth­oxy­phen­yl)-2-(methyl­sulfan­yl)benzo[g]pyrimido[4,5-b]quinoline-4,6,11(3H,5H,12H)-trione, with Z' = 3, forms a three-dimensional hydrogen-bonded framework con­taining five types of hydrogen bond

Five types of hydrogen bond link three independent mol­ecules into a three-dimensional framework structure.

Comparison of N-(3,4,5-tri­meth­oxy­benzyl­idene)naphthalen-1-amine and its reduction product N-(3,4,5-tri­meth­oxy­benzyl)naphthalen-1-amine

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.

(E)-1-[(5-Chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)methyl­idene]-2-phenyl­hydrazine: sheets built from [pi]-stacked hydrogen-bonded chains

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.

Three closely related dibenzazepine carb­oxy­lic acids: hydrogen-bonded aggregation in one, two and three dimensions

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.

Four related benzazepine derivatives in a reaction pathway leading to a benzazepine carboxylic acid: hydrogen-bonded assembly in zero, one, two and three dimensions

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.

(8RS)-4-Amino-6-(4-chloro­phenyl)-8-(2,4-di­chloro­thia­zol-5-yl)-8,9-di­hydro-7H-pyrimido[4,5-b][1,4]diazepine N,N-di­methyl­formamide mono­solvate: sheets built from N-H...N and C-H...O hydrogen bonds

The molecular components of a solvated 7H-pyrimido[4,5-b][1,4]diazepine derivative are linked by hydrogen bonds to form sheets containing four types of hydrogen-bonded ring.

Octyl 1-(5-tert-butyl-1H-pyrazol-3-yl)-2-(4-chloro­phenyl)-1H-benzimid­azole-5-carboxyl­ate: complex sheets built from N—H...N, C—H...N and C—H...O hydrogen bonds

Hydrogen bonds link mol­ecules of the title compound into tripartite sheets, with the hydrogen bonds in the central layer and the hydro­carbyl substituents on the exterior.

(E)-3-{4-[(7-Chloro­quinolin-4-yl)­oxy]-3-meth­oxy­phenyl}-1-(4-methyl­phenyl)prop-2-en-1-one: a ladder-like structure resulting solely from [pi]-[pi] stacking inter­actions

Two independent [pi]-[pi] stacking inter­actions link the mol­ecules of (E)-3-{4-[(7-chloro­quinolin-4-yl)­oxy]-3-meth­oxy­phenyl}-1-(4-methyl­phen­yl)prop-2-en-1-one, but hydrogen bonds are absent from the structure.

2-Ethyl­sulfanyl-7-(furan-2-yl)-4-(thio­phen-2-yl)pyrazolo­[1,5-a][1,3,5]triazine: [pi]-stacked chains of hydrogen-bonded R₂²(10) dimers

In a substituted pyrazolo­[1,5-a][1,3,5]triazine, centrosymmetric dimers generated by C-H...O hydrogen bonds are linked into chains by a [pi]-[pi] stacking inter­action.

2-Ethyl-1-[5-(4-methyl­phen­yl)pyrazol-3-yl]-3-(thio­phene-2-carbon­yl)iso­thio­urea: mol­ecular ribbons containing three types of hydrogen-bonded ring

Mol­ecules of 2-ethyl-1-[5-(4-methyl­phen­yl)pyrazol-3-yl]-3-(thio­phene-2-carbon­yl)iso­thio­urea, formed by reaction of S,S-diethyl 2-thenoylimidodi­thio­carbonate with 5-amino-3-(4-methyl­phen­yl)-1H-pyrazole, form hydrogen-bonded ribbons in which centrosymmetric (4) and (6) rings alternate.