Developed community standards on setting the diffraction resolution yields improved density maps and a new monosaccharide model in pdb_00004dda

A query over the electron density fit of a monosaccharide in pdb_00004dda was resolved through applying the data metrics of the raw diffraction data processing that have evolved though the decade since the original publication. This improved the electron-density quality to allow a definitive model fit.

Strontium hexa­fluorido­stannate(IV) dihydrate

Sr[SnF₆]·2H₂O is isostructural with the analogous hexa­fluorido­iridate(IV) and consists of almost undistorted [SnF₆]^2– octa­hedra and of distorted [SrF₅(H₂O)₃] square anti­prisms linked via common water mol­ecules into centrosymmetric dimers.

Dilead(II) oxyhydroxide bromide

The crystal structure of Pb₂O(OH)Br has tetra­gonal symmetry and differs from those of the Cl (ortho­rhom­bic) and I (monoclinic) analogues.

Reinvestigation of the crystal structure of UF₆ by single-crystal X-ray diffraction

Re-refinement of the crystal structure of UF₆ using single-crystal X-ray diffraction data at 100 K allowed to obtain a more precise structural model in comparison with previous studies.

Diamminecopper(I) divanadate(IV,V)

[Cu(NH₃)₂]V₂O₅ contains layers of {V₂O₅}⁻ anions expanding in the bc plane, separated by almost linear [Cu(NH₃)₂]⁺ cations.

Tris(3,5-di­aza-1-azonia-7-phosphaadamant-7-yl)(1,3,5-tri­aza-7-phospha-adamantane)silver(I) dicarbonate

In the title salt, the silver(I) ion is coordinated by both neutral 1,3,5-tri­aza-7-phosphaadamantane (PTA) and protonated PTAH⁺ ligands.

[(1,2,5,6-η)-Cyclo­octa-1,5-diene](1-methyl-3-propylimidazol-2-yl­idene-κC)(tri­phenyl­phosphane-κP)iridium(I) tetra­fluorido­borate

The complex cation in the title compound has a distorted square-planar conformation around the Ir^I atom, formed by a bidentate cyclo­octa-1,5-diene (COD) ligand, a phosphane ligand, and an N-heterocyclic carbene (NHC) ligand.

4-Bromo­pyridinium tri­chlorido­stannate(II)

The crystal structure of the title compound comprises [Sn^IICl₃]⁻ and [4-BrPyH]⁺ ions. The structural parameters of the anion and the cation are presented and compared with those in other compounds. Inter­molecular inter­actions such as tetrel bonds, π–π inter­actions and N—H⋯Cl hydrogen bonds are analysed.

{2-[tert-But­yl(pyridin-2-yl)phosphino]phen­yl}diphenyl­phosphine

The title compound, C₂₇H₂₇NP₂, consists of a di­phenyl­phosphino and a tert-but­yl(2-pyrid­yl)phosphino group bridged by a 1,2-phenyl­ene backbone.

2-De­oxy-D-galactitol

The title compound, 2-de­oxy-D-galactitol, was prepared by sodium borohydride reduction of 2-de­oxy-D-galactose and crystallized from water. Its crystal structure contains two crystallographically independent mol­ecules in the asymmetric unit, which are linked by O—H⋯O hydrogen bonds into a three-dimensional network.

L-Iditol

The title compound, L-iditol, was crystallized from aqueous solution. It crystallizes in the monoclinic space group P2₁ with one mol­ecule in the asymmetric unit. The mol­ecules are linked by O—H⋯O hydrogen bonds into a three-dimensional network.

Ethyl α-D-sorboside monohydrate

The title compound, ethyl α-D-sorboside monohydrate, was prepared by Fischer glycosyl­ation of D-sorbose with ethanol. The crystal structure contains one water mol­ecule per sorboside mol­ecule, and the components are linked by O—H⋯O hydrogen bonds.

N,N′-Bis(2,6-diiso­propyl­phen­yl)-N-hy­droxy­formamidine–N,N′-bis­(2,6-diiso­propyl­phen­yl)-N-oxidoformamidinium (1/1)

The title compound is a symmetrical di­aryl­formamidine derivative bearing diisopropyl substituents. The compound contains two independent mol­ecules in the asymmetric unit, one being the zwitterionic and the other the neutral forms of the di­aryl­formamidine derivative. The two mol­ecules are connected by O—H⋯O and N—H⋯N hydrogen-bonding inter­actions within a cyclic assembly.

Metformindiium dibromide

The crystal structure of the dibromide salt of metforminium(2+) in space group P2₁/c is compared to that of the dichloride analogue, previously reported in space group P2₁.

10-Phenyl-9-[2-(tri­fluoro­meth­yl)phen­yl]-3,4,6,7,9,10-hexa­hydro­acridine-1,8(2H,5H)-dione

The two crystallographic independent mol­ecules in the title compound display short intra­molecular C—H⋯F hydrogen bonds.

3-Methyl-2-nitro­aniline

The structure of the title compound completes structural characterization for the family of methyl-2-nitro­aniline isomers. Bond lengths and angles conform to reported values in other methyl-2-nitro­aniline structures, except for the large angle [36.82 (4)°] formed between the phenyl ring and nitro group mean planes, which is due to steric crowding by the neighboring methyl group

10a-Hy­droxy-9-[2-(tri­fluoro­meth­yl)phen­yl]-3,4,5,6,7,8a,9,10a-octa­hydro-1H-xanthene-1,8(2H)-dione

The title compound, C₂₀H₁₉F₃O₄, crystallizes with two independent mol­ecules with similar geometry. In both mol­ecules the tetra­hydro­pyran, cyclo­hexene and cyclo­hexane rings of the xanthene moiety adopt half-chair, half-boat and chair conformations, respectively.

3-(4-Methyl­phen­yl)-5-phenyl-1,2-thia­zole

The asymmetric unit of the title 3-(4-methyl­phen­yl)-5-phenyl-1,2-thia­zole compound comprises two independent mol­ecules with nearly planar geometries. No classical hydrogen bonds are found in the crystal structure.

Methyl α-D,L-sorboside

The title compound, methyl α-D,L-sorboside, was prepared from an equimolar mixture of D- and L-sorbose (D:L = 1:1) by Fischer glycosidation in methanol. The asymmetric unit contains one mol­ecule each of methyl α-D-sorboside and methyl α-L-sorboside, which are linked by O—H⋯O hydrogen bonds into a two-dimensional network parallel to (001).

L-Talitol

The crystal structure of L-talitol, the sugar alcohol corresponding to L-talose, is presented. The mol­ecules are linked by O—H⋯O hydrogen bonds into a three-dimensional network.

(E)-4-{[(4-Meth­oxy­naphthalen-1-yl)methyl­idene]amino}­phenol

The title compound was obtained from the reaction of 4-hy­droxy-aniline and 4-meth­oxy-1-naphthaldehyde in ethanol. The dihedral angle between the phenol ring and the mean plane of the naphthalene ring system is 75.81 (6)°.

rac,endo-9-Hy­droxy-9-methyl­tri­cyclo­[5.2.2.0^2,6]undeca-4,10-dien-8-one

The tricyclic mol­ecule of the title compound is composed of four nearly planar subunits. Hydrogen bonds connect the ketol units to chains along the a-axis direction. The structure is further consolidated by two C—H⋯O hydrogen bonds, one to the carbonyl and one to the hy­droxy group.

α-L-Glucose

The title compound, α-L-glucose, was crystallized by slow evaporation from aqueous solution. It crystallizes in the ortho­rhom­bic space group P2₁2₁2₁, and the mol­ecules are linked by O—H⋯O hydrogen bonds into a three-dimensional network.