Tzu-Chien Fang

7-Hy­droxy­indan-1-one

In the title compound, C9H8O2, an intramolecular O—H⋯O hydrogen bond generates an S(6) ring. The dihedral angle between the mean plane of the S(6) ring and the benzene ring is 1.89 (2)°. In the crystal, inversion-related molecules are linked by pairs of O—H⋯O hydrogen bonds, forming a cyclic dimers with R 2 2(12) graph-set motif. Weak intermolecular C—H⋯Ocarbonyl and C—H⋯Ohydroxy hydrogen bonds link the dimers into chains along [010], generating two C(6) motifs that overlap three C atoms, forming R 2 2(8) ring motifs.

(6RS,9SR)-6,7-Dibromo-1,2,3,4-tetra-hydro-1,4-methano-anthracene.

The title compound, C15H12Br2, comprises a norbornane unit having a dibromonaphthalene ring fused on one side. Both Br atoms are twisted slightly out of the plane of the naphthalene ring system with a Br—C—C—Br torsion angle of 5.3 (5)°. In the crystal, molecules are linked by weak intermolecular C—H⋯Br hydrogen bonds, forming an infinite C(9) chain along [110].

rac-1,2,3,4-Tetra­hydro-1,4-methano­anthracene-6,7-dicarbonitrile

The title compound, C17H12N2, comprises a norbornane unit having a dicyanonaphthalene ring fused on one side. Both cyano groups are twisted slightly out of the plane of the naphthalene ring system [C—C—C—C torsion angle = 1.9 (2)°]. In the crystal, inversion-related molecules are linked by pairs of weak C—H⋯N hydrogen bonds, forming dimers.

(E)-4-[(4-Diethyl-amino-2-hy-droxy-benzyl-idene)amino]-benzonitrile.

The title compound, C18H19N3O, displays an E conformation with respect to the C=N double bond. The dihedral angle between the mean planes of the two benzene rings is 24.49 (3)°. An intramolecular O—H⋯N hydrogen bond generates an S(6) ring. In the crystal, molecules are linked by nonclassical intermolecular C—H⋯O hydrogen bonds to form an infinite one-dimensional chain along [010], generating a C(8) motif.

(Z)-4-(2-Hy­droxy­benzyl­idene)-1-methyl-2-phenyl-1H-imidazol-5(4H)-one

In the title compound, C17H14N2O2, the asymmetric unit comprises two molecules that are comformationally similar [the dihedral angles between the phenyl rings in each are 46.35 (2) and 48.04 (3)°], with the conformation stabilized by intramolecular O—H⋯N hydrogen bonds, which generate S(7) rings. In the crystal, inversion-related molecules are linked by pairs of weak C—H⋯O hydrogen bonds, forming dimers with an R 2 2(16) graph-set motif. Weak inter-ring π–π stacking is observed in the structure, the shortest centroid-to-centroid distance being 3.7480 (13) Å.

1-Hy­droxy-11H-benzo[b]fluoren-11-one

The title compound, C17H10O2, is nearly planar, the maximum atomic deviation being 0.053 (2) Å. In the molecule, an intramolecular O—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, inversion-related molecules are linked by pairs of weak C—H⋯O hydrogen bonds, forming dimers. π–π stacking is observed in the crystal structure, the closest centroid–centroid distance being 3.7846 (16) Å.

3-{[(4Z)-1,2-Dimethyl-5-oxoimidazol-4-yl­idene]meth­yl}-4-hy­droxy­benzonitrile

In the title compound, C13H11N3O2, an intramolecular O—H⋯N hydrogen bond generates an S(7) ring. The dihedral angle between the mean plane of the benzene ring and the imidazolidinone ring is 3.05 (2)°. In the crystal, inversion-related molecules are linked by dual C—H⋯Ocarbonyl hydrogen bonds to form a dimer with an R 2 2(14) graph-set motif. A C—H⋯Ohydroxy interaction links pairs of molecules into another type of cyclic dimer with an R 2 2(18) motif. The molecules are further linked by C—H⋯N interactions to form layers parallel to (001). Offset π–π stacking [3.3877 (8) Å] is observed in the crystal structure, with an interplanar spacing between the planes of neighboring benzene rings of 3.444 (1) Å.

2-(4-Nitro-benzyl-idene)malononitrile.

In the title compound, C10H5N3O2, the benzylidenemalononitrile unit is nearly planar, with a maximum deviation of 0.129 (2) Å for a terminal N atom; the nitro group is approximately coplanar with the benzene ring [dihedral angle = 8.8 (3)°]. An intramolecular C—H⋯N hydrogen bond stabilizes the molecular conformation.

2-(2-Hy-droxy-phen-yl)-1,3-benzothia-zole-6-carbaldehyde.

The molecule of the title compound, C14H9NO2S, is nearly planar, the maximum atomic deviation being 0.081 (2) Å. An intramolecular O—H⋯N bond generates an S(6) ring motif. In the crystal, inversion-related molecules linked by a pair of weak C—H⋯O hydrogen bonds form a supramolecular dimer. π–π stacking is observed between the thiazole and benzene rings of adjacent molecules, the centroid–centroid distance being 3.7679 (9) Å.