organic compounds
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.
organic compounds
A bipyridinediium propenide salt forms complex hydrogen-bonded sheets in which each cation acts as a sixfold donor of C-HN hydrogen bonds and each anion acts as a threefold acceptor.