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In the title compound, C30H20N2O6·C2H6O·0.5H2O, the solvent water mol­ecule lies on a twofold rotation axis. The dihedral angle between the essentially planar isoindole ring systems [maximum deviations = 0.028 (1) and 0.022 (1) Å] is 47.12 (5)°. The dihedral angle between the benzene rings is 81.32 (7)°. In the crystal, the components are linked into a three-dimensional network via O—H...O hydrogen bonds.

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In the title mol­ecule, C18H18O4, the dihedral angle between the benzene rings is 52.52 (7)°. The C=C bond of the central enone group adopts a trans conformation. The relative conformation of the two double bonds in the enone group is s-transoid. In the crystal, mol­ecules are linked by pairs of weak C—H...O hydrogen bonds, forming inversion dimers.

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In the title mol­ecule, C22H20O5, the C=C bond of the central enone group adopts an E conformation. The dihedral angle formed by the benzene ring and the naphthalene ring system is 12.6 (4)°. The hy­droxy group attached to the naphthalene ring is involved in an intra­molecular O—H...O hydrogen bond. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains along [010]. In addition, π–π stacking inter­actions are present, with centroid–centroid distances of 3.6648 (15) and 3.8661 (15) Å between the benzene and two naphthalene rings.

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In the title mol­ecule, C18H18O4, the C=C bond of the central enone group adopts a trans conformation. The relative conformation of the C=O and C=C bonds is s-cisoid. The dihedral angle between the planes of the benzene rings is 29.49 (12)°. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains along [010].

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In the title mol­ecule, C19H20O6, the conformation about the C=C bond of the central enone group is E. The dihedral angle formed by the benzene rings is 11.6 (2)°. The hy­droxy group is involved in an intra­molecular O—H...O hydrogen bond. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains along [010].
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