{4-Bromo-2-[(2-{(ethyl­sulfan­yl)[(2-oxido­benzyl­idene-κO)amino-κN]methyl­idene}hydrazinyl­idene-κN¹)meth­yl]phenolato-κO}(ethanol-κO)dioxido­uranium(VI)

In the title complex, [U(C₁₇H₁₄BrN₃O₂S)O₂(C₂H₅OH)], the U^VI cation has a distorted penta­gonal–bipyramidal environment with the penta­gonal plane defined by two N and two O atoms of the tetra­dentate Schiff base ligand and the O atom of the ethanol mol­ecule. Two oxide O atoms occupy the axial positions. The azomethine C=N group and the Br atom are disordered over two positions in a 0.8356 (18):0.1644 (18) ratio. The ethyl­thiolyl group is disordered over three conformations in a 0.8356 (18):0.085 (6):0.079 (6) ratio, and the ethanol ligand is also disordered over three orientations in a 0.470 (16):0.277 (19):0.253 (18) ratio. In the crystal, mol­ecules form centrosymmetric dimers through hydrogen bonding between ethanol O—H donors and phenolate O-atom acceptors. Weak C—H...O inter­actions consolidate the crystal packing.

3β,6α-Diacet­oxy-5,9α-dihy­droxy-5α-cholest-7-en-11-one

The title compound, C₃₁H₄₈O₇, a polyoxygenated steroid, was obtained by chemical oxidation of 7-de­hydro­cholesteryl acetate. The mol­ecular geometry features trans A/B and C/D junctions at the steroid core with the acetyl groups in the equatorial position and a fully extended conformation for the alkyl side chain. A chair conformation is observed for rings A and C while ring B adopts a half-chair conformation. The five-membered ring D has an envelope conformation, with the C atom bearing the methyl group at the flap. The terminal isopropyl group and one acetyl group are disordered over two sets of sites with 0.774 (8):0.226 (8) and 0.843 (7):0.157 (7) ratios, respectively. An intra­molecular S(6) O—H...O hydrogen-bonding motif involving a hy­droxy donor and acceptor is observed. In the crystal, chains of mol­ecules running along the b axis are formed via O—H...O hydrogen bonds between hy­droxy donors and carbonyl acceptors of the ordered acetyl group, giving rise to a C(14) motif. The chains are wrapped around the 2₁ screw axes.

4,5-Di­amino-3-[(E,E)-4-(4,5-di­amino-4H-1,2,4-triazol-3-yl)buta-1,3-dien­yl]-4H-1,2,4-triazol-1-ium chloride

The title compound, C₈H₁₃N₁₀⁺·Cl⁻, is the monochlorhydrate salt of an aromatic bis­(di­amino­triazole). The cation is centrosymmetric, lying about an inversion centre (C_i symmetry) because the acidic H atom is disordered over two centrosymmetrically related ring N atoms, with equal multiplicity. It is noteworthy that protonation occurs at an N atom of the ring, instead of at the C—NH₂ or N—NH₂ amino groups. The chloride anions are also in special positions, as they lie on binary axes, and so the crystallographically independent unit contains half of a formula unit. The N atom of the C—NH₂ group is sp²-hybridized and the amino group is coplanar with the triazole ring [dihedral angle = 5 (3)°], while the N atom of the N—NH₂ amino group is pyramidal. The C=C bonds are in E conformations and the cation is flat because the conformation of the carbon chain is fully extended. The chloride anions are hexa­coordinated, in a distorted trigonal–prismatic geometry, and they are involved, as acceptors, in six hydrogen bonds. Chains of hydrogen-bonded cations, running along c and a + c, are generated by c-glide and C₂ rotation, respectively. This combination of N—H...Cl and N—H...N hydrogen bonds leads to the formation of a three-dimensional network.

N,N'-Di­hydroxy­benzene-1,2:4,5-tetra­carboximide dihydrate

In the title compound, C₁₀H₄N₂O₆·2H₂O, the organic mol­ecule has crystallographically imposed inversion symmetry. The atoms of the three fused rings of the mol­ecule are coplanar within 0.0246 (8) Å, while the two hy­droxy O atoms are displaced from the mean plane of the mol­ecule by 0.127 (1) Å. In the crystal, infinite near-planar layers of close-packed mol­ecules are formed by hydrogen bonding between water O-H donor groups and carbonyl O-atom acceptors, and by weak inter­actions between C-H donor groups and water O-atom acceptors. The layers are parallel to the {102} family of planes. The stacked planes are held together by hydrogen bonding between N-OH donor groups and water O-atom acceptors.