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The title compound, C16H14Cl2N2O2, is a Schiff base compound, derived from the condensation of 5-chlorosalicylaldehyde and ethane-1,2-diamine in MeOH. The molecule lies about an inversion centre at the mid-point of the C—C bond of the ethylenediamine unit. Intramolecular O—H…N hydrogen bonds contribute to the planarity of the aromatic imide units of the molecule. [ABSTRACT FROM AUTHOR]

In the title compound, C24H18F3N3O, the molecule exists in the enamine–keto tautomeric form. The pyrazolone ring makes dihedral angles of 31.8 (2), 45.4 (2) and 71.2 (2)° with the 1-phenyl, aniline and methylene-bound phenyl rings, respectively. An intramolecular N—H...O hydrogen bond helps to stabilize the molecular conformation. [ABSTRACT FROM AUTHOR]

In methylaminium 4',7-dihydroxyisoflavone-3'-sulfonate di- hydrate, CH6N+·C15H9O7S-·2H2O, 11 hydrogen bonds exist between the methylaminium cations, the isoflavone-3'-sulfonate anions and the solvent water molecules. In hexaaquairon(II) bis(4',7-diethoxyisoflavone-3'-sulfonate) tetra- hydrate, [Fe(H2O)6](C19H17O7S)2·4H2O, 12 hydrogen bonds exist between the centrosymmetric [Fe(H2O)6]2+ cation, the isoflavone-3'-sulfonate anions and the solvent water molecules. Additional π-π stacking interactions generate three-dimensional supramolecular structures in both compounds. [ABSTRACT FROM AUTHOR]