2-Amino-4-(2-chloro-phen-yl)-7,7-di-methyl-5-oxo-5,6,7,8-tetra-hydro-4H-chromene-3-carbonitrile hemihydrate.

The asymmetric unit of the title compound, C(18)H(17)ClN(2)O(2)·0.5H(2)O, contains two organic mol-ecules and one solvent water mol-ecule. In each organic mol-ecule, the cyclo-hexene ring adopts an envelope conformation with the C atom connecting the two methyl groups on the flap; the 4H-pyran ring is nearly planar [maximum deviation = 0.113 (3) Šin one mol-ecule and 0.089 (3) Šin the other mol-ecule] and is approximately perpendicular to the chloro-phenyl ring [dihedral angle = 86.43 (15)° in one mol-ecule and 89.73 (15)° in the other mol-ecule]. Inter-molecular N-H⋯N, N-H⋯O, O-H⋯O and O-H⋯Cl hydrogen bonding is present in the crystal.

9-(4-Chloro-phen-yl)-3,6-diphenyl-1,2,3,4,5,6,7,8-octa-hydro-9H-xanthene-1,8-dione.

In the title compound, C(31)H(25)ClO(3), the central ring of the xanthene core shows a shallow boat conformation, while the outer six-membered rings display envelope conformations. The dihedral angle between the outer aromatic rings is 88.1 (3)° and the dihedral angles between the chloro-benzene ring and the two phenyl rings are 69.5 (2) and 69.6 (2)°.

Dielectric anisotropy of a homochiral rare-earth metal complex.

A homochiral rare-earth metal Tb complex that exhibited a very large dielectric anisotropic property with a temperature-independent feature is obtained. Our findings on high-dielectric anisotropy will provide a new impetus in this field of materials science.

2-(1H-Tetra-zol-5-yl)benzonitrile.

The title compound, C(8)H(5)N(5), was synthesized from phthalonitrile. The benzonitrile and tetra-zole rings are inclined at a dihedral angle of 37.14 (11)°. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds link the tetra-zole rings of adjacent mol-ecules, forming chains along the a axis.

4-Amino-3-phenyl-1H-1,2,4-triazole-5(4H)-thione.

In the title compound, C(8)H(8)N(4)S, the planar triazole ring forms a dihedral angle of 13.7 (2)° with the phenyl ring. The crystal structure is stabilized by inter-molecular N-H⋯S hydrogen-bond inter-actions, linking the mol-ecules into chains along the a axis.

Dichloridobis(3,5-dimethyl-1H-pyrazol-4-amine-κN)cobalt(II).

In the title compound, [CoCl(2)(C(5)H(9)N(3))(2)], the Co(II) atom adopts a slightly distorted tetra-hedral coordination geometry provided by two chloride anions and two N atoms from the organic ligands. The dihedral angle between the pyrazole rings is 85.91 (10)°. In the crystal structure, mol-ecules are linked into a three-dimensional network by inter-molecular N-H⋯N and N-H⋯Cl hydrogen-bonding inter-actions.