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.
research papers
Multiple hydrogen bonds in tris(2,2′-bipyridine)iron(II) bis(1,1,3,3-tetracyano-2-ethoxypropenide) link water molecules, anions and chiral cations into two interpenetrating chiral frameworks.