Ming-Hui Luo

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.

3-Oxo-2,3-dihydro-1H-inden-4-yl acetate.

In the title compound, C11H10O3, the 1-indanone unit is essentially planar (r.m.s. deviation = 0.036 Å). In the crystal, molecules are linked by non-classical C—H⋯O hydrogen bonds, forming a C(6) chain along [010].

1-Meth­oxy-11H-benzo[b]fluoren-11-one

In the title compound, C18H12O2, the non-H atoms are nearly coplanar, the maximum atomic deviation being 0.113 (2) Å. π–π stacking is observed in the crystal structure, the shortest centroid–centroid distance being 3.5983 (19) Å. The molecular packing is further stabilized by weak C—H⋯O hydrogen bonds, forming an infinite chain along [100] and generating a C(6) motif.

Penta­cyclo­[8.2.1.14,7.02,9.03,8]tetra­deca-5,11-diene

The title compound, C14H16, was prepared through [2 + 2] cycloaddition of norbornadiene. There are two independent molecules in the asymmetric unit: each is centrosymmetric with the centroid of the four-membered ring located about an inversion center. Each molecule possesses an exo–trans–exo conformation.

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.