catena-Poly­[[aquadicinnamatocadmium]-μ-1,4-di­aza­bi­cyclo­[2.2.2]­octane]

The title compound, [Cd(C₉H₈O₂)₂(C₆H₁₂N₂)(H₂O)]_n, forms a one-dimensional polymeric chain. Both cinnamate ligands are bidentate anions and the 1,4-diazbi­cyclo­[2.2.2]­octane (dabco) mol­ecule acts as an end-to-end bridging ligand. The Cd atom, located at a position of site symmetry m, has a slightly distorted pentagonal bipyramidal coordination environment consisting of two N atoms of dabco ligands, four cinnamate O atoms and one water ligand, with the dabco N atoms in the axial positions. The chains are cross-linked by hydrogen bonds involving the coordinated water mol­ecules, forming a two-dimensional network.

1,4-Dimeth­yl-1,4-diazo­niabicyclo­[2.2.2]octa­ne tetra­chloro­cuprate(II)

The title compound, (C₈H₁₈N₂)[CuCl₄], crystallizes with two cations and two anions in the asymmetric unit. The cation was obtained by methyl­ation of 1,4-diaza­bicyclo­[2.2.2]octa­ne. C—H...Cl hydrogen-bonding inter­actions link cations and anions to form an infinite three-dimensional network.

N,N′-Dimethyl-1,4-diazo­niabicyclo­[2.2.2]octane tetra­chloro­cobaltate(II)

The title compound, (C₈H₁₈N₂)[CoCl₄], crystallizes with two cations, one complete anion and two half-anions in the asymmetric unit, two anions having twofold rotation symmetry. The cation was obtained by methyl­ation of DABCO (1,4-diaza­bicyclo­[2.2.2]-octa­ne). The geometry of the [CoCl₄]²⁻ anion can be described as distorted tetra­hedral. C—H...Cl hydrogen-bond inter­actions link cations and anions in the crystal structure.

1,6,6-Trimethyl-1,2,6,7,8,9-hexa­hydro­phen­anthro[1,2-b]furan-10,11-dione

The title compound, C₁₉H₂₀O₃, is widely used in China to treat coronary heart diseases. The asymmetric unit contains two independent mol­ecules in which both the five- and the terminal six-membered rings adopt half-chair conformations.

1,6-Dimethyl­phenanthro[1,2-b]furan-10,11-dione

The title compound, C₁₈H₁₂O₃, also known as tanshinone, contains four fused rings. The crystal packing involves offset π-stacking inter­actions and C—H...O hydrogen bonds.

(E,E)-4-Hydr­oxy-3-methoxy­benzaldehyde azine

The title compound, C₁₆H₁₆N₂O₄, contains two vanillin aromatic rings, which are bridged by a C=N—N=C unit. There are two half-mol­ecules in the asymmetric unit; the mid-points of the N—N bonds lie on centres of symmetry. The mol­ecular structure is stabilized by two intra­molecular O—H...O and inter­molecular O—H...O and O—H...N hydrogen bonds.