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organic compounds
Crystals of a second polymorph of violuric acid monohydrate [systematic name: pyrimidine-2,4,5,6(1H,3H)-tetrone monohydrate], C4H3N3O4·H2O, have higher density and a more extensive hydrogen-bonding arrangement than the previously reported polymorph. Violuric acid and water molecules form essentially planar hydrogen-bonded sheets, which are stacked in an offset ...ABCABC... repeat pattern involving no ring-stacking interactions.
organic compounds
The crystal structure of the title compound, C9H11NO·C9H9N5, contains one molecule of each component in the asymmetric unit. Approximately planar clusters of four molecules are formed by N-H
N and N-HO hydrogen bonds, and further N-HN hydrogen bonds link adjacent clusters to form pleated ribbons. ![[pi]](/logos/entities/pi_rmgif.gif)
- interactions are found between triazine and aldehyde benzene rings in different clusters, generating stacks along the monoclinic b axis. The intramolecular geometry of the two components is similar to that found in other crystal structures containing these molecules. Both molecules are approximately planar, except for methyl H atoms, with a small twist about the C-C bond linking the phenyl and triazine rings.
N and N-HO hydrogen bonds, and further N-HN hydrogen bonds link adjacent clusters to form pleated ribbons. - interactions are found between triazine and aldehyde benzene rings in different clusters, generating stacks along the monoclinic b axis. The intramolecular geometry of the two components is similar to that found in other crystal structures containing these molecules. Both molecules are approximately planar, except for methyl H atoms, with a small twist about the C-C bond linking the phenyl and triazine rings.metal-organic compounds
![[kappa]](/logos/entities/kappa_rmgif.gif)
The 1:1 adduct of N,N'-bis(2-chlorobenzylidene)ethylenediamine (cb2en) with copper(I) chloride proves to be an ionic compound with CuI-centred cations and anions, [Cu(C16H14Cl2N2)2][CuCl2]·CH3CN. In the cation, the CuI atom has a flattened tetrahedral coordination geometry, with a small bite angle for the chelating ligands, which form a double-helical arrangement around the metal centre. The anion is almost linear, as expected. The packing of the cations involves intermolecular - interactions, which lead to columns of translationally related cations along the shortest unit-cell axis, with anions and solvent molecules in channels between them.
- interactions, which lead to columns of translationally related cations along the shortest unit-cell axis, with anions and solvent molecules in channels between them.
