Bis[hexa­amminecobalt(III)] penta­chloride nitrate

The title compound, [Co(NH₃)₆]₂Cl₅(NO₃), was obtained under hydro­thermal conditions. The asymmetric unit contains three Co³⁺ ions, one lying on an inversion center and the other two located at 2/m positions. All Co³⁺ ions are six-coordinated by NH₃ mol­ecules, forming [Co(NH₃)₆]³⁺ octahedra, with Co—N distances in the range 1.945 (4)–1.967 (3) Å. The nitrate N atom and one of the O atoms lie at a mirror plane. Among the Cl⁻ anions, one lies in a general position, one on a twofold axis and two on a mirror plane. N—H...O and N—H...Cl hydrogen bonds link the cations and anions into a three-dimensional network.

Triethyl­ammonium (indane-1,2,3-trione 1,2-dioximato-κ²N¹,O²)(indane-1,2,3-trione 2-oximato 1-oxime-κ²N¹,O²)nickel(II)

In the title compound, (C₆H₁₆N)[Ni(C₉H₄N₂O₃)(C₉H₅N₂O₃)], the Ni^IIion is four-coordinated by two N atoms and two O atoms from two indane-1,2,3-trione-1,2-dioxime ligands. The two organic ligands are linked by an intra­molecular O—H...O hydrogen bond. In the crystal, mol­ecules are linked by N—H...O hydrogen-bonds.

Aqua[1-(pyridin-2-yl)ethanone oximato][1-(2-pyridin-2-yl)ethanone oxime]­copper(II) perchlorate mono­hydrate

In the title compound, [Cu(C₇H₇N₂O)(C₇H₈N₂O)(H₂O)]ClO₄·H₂O, the Cu^II ion is five-coordinated by the N atoms from the 1-(pyridin-2-yl)ethanone oximate and 1-(pyridin-2-yl)ethan­one oxime ligands and by the water O atom in a distorted square-pyramidal geometry. The two organic ligands are linked by an intra­molecular O—H...O hydrogen bond. In the crystal, mol­ecules and ions are linked by O—H...O hydrogen-bonding inter­actions, forming chains along the a axis. The perchlorate O atoms are disordered in a 0.58 (2):0.42 (2) ratio.

5α-Hy­droxy­eudesm-4(15),11(13)-dien-8β,12-olide

The title compound, C₁₅H₂₀O₃, a sesquiterpene lactone, was isolated from the aerial parts of Carpesium minus Hemsl. (Compositae). The mol­ecule is composed of three rings, with the two cyclo­hexane rings in chair conformations and the cyclo­pentane ring adopting a twist conformation. The A/B ring junction is trans-fused. The absolute configuration shown has been arbitrarily assigned. In the crystal, mol­ecules are linked into [100] chains by O—H...O hydrogen bonds.

N-[4-Chloro-3-(trifluoro­meth­yl)phen­yl]-2,2-dimethyl­propanamide

In the title compound, C₁₂H₁₃ClF₃NO, the C—C—N—C torsion angle between the benzene ring and the pivaloyl group is −33.9 (5)°. In the crystal, molecules are linked via N—H...O hydrogen bonds to form chains running parallel to the c axis. Weak van der Waals inter­actions are also observed.