Re-refinement of sodium ammonium sulfate dihydrate at 170 K

The crystal structure of sodium ammonium sulfate dihydrate has been redetermined at 170 K on the basis of single-crystal X-ray data.

Tetra­kis(di­cyclo­hexyl­amido)­zirconium(IV)

The crystal structure of Zr(C₁₂H₂₂N)₄ is isotypic with its cerium(IV) analogue.

trans-Di­aqua­bis­(N,N,N′-tri­methyl­ethylenedi­amine)­nickel(II) dichloride

The nickel(II) atom in the cation of the title salt has a slightly distorted octa­hedral coordination environment defined by two O and four N atoms.

Bis(μ₄-adamantane-1,3-di­carboxyl­ato-1κO¹:2κO^1′:3κO³:4κO^3′)octa­carbonyl-1κ²C,2κ²C,3κ²C,4κ²C-tetra­kis­[tris­(4-methyl­phen­yl)phosphane]-1κP,2κP,3κP,4κP-tetra­osmium(I)(2 Os–Os)

[Os₂(CO)₄(tri-p-tolyl­phosphine)₂]₂(μ₄-adamantane-1,3-di­carboxyl­ate)₂ is a mol­ecular loop consisting of two parallel diosmium(I) sawhorse units linked together by two bridging di­carboxyl­ato ligands. The title compound is only the second example of a Group 8 dinuclear sawhorse complex with an adamantane-based di­carboxyl­ato ligand.

Di­aqua­bis­(4-ferrocenyl-1,1,1-tri­fluoro-4-oxobutan-2-olato)cobalt(II)

In the title compound, the coordinated water mol­ecules are in a cis disposition and the Cp rings of the ferrocene groups are close to eclipsed.

Bis[tris­(pyridin-2-yl)amine]­iron(II) tris­(di­cyano­methyl­idene)methane­diide

Both ions in the title compound lie across centres of inversion, with the anion being statistically disordered.

Chlorido­(4′-chloro-2,2′:6′,2′′-terpyridine-κ³N,N′,N′′)(tri­fluoro­methane­sulfonato-κO)zinc(II) aceto­nitrile monosolvate

The title compound structure is a unique example of a zinc(II) metal center surrounded by a tridentate chloro­terpyridine ligand, a chloride and a coordinated tri­fluoro­methane­sulfonate in a distorted square-pyramidal geometry.

3-(2-Meth­oxy­phen­yl)-2,3-di­hydro-1H-benzo[f]chromen-1-one

In the title flavanone, the mol­ecules are linked by weak C—H⋯O inter­actions into [101] chains.

11,11-Di­phenyl-11H-indeno­[1,2-b]quinoxaline

In the title compound, the mean planes of the pendant benzene rings are approximately perpendicular to one another, making a dihedral angle of 79.3 (5)°; the indeno­[1,2-b]quinoxaline ring system is twisted with respect to the pendant benzene rings by 70.0 (4) and 67.6 (3)°.

Ethyl 1H-indole-2-carboxyl­ate

The synthesis and structure of 1H-indole-2-carboxyl­ate is presented.

Diosgenin-3,6-dione: second polymorph in space group P2₁2₁2₁

A polymorphic modification of the title steroidal compound, derived from diosgenin, results from a conformational alteration for the A/B ring system.

6-(3,4-Di­fluoro­phen­yl)-7,8,13,14-tetra­hydro­dibenzo[c,k]phenanthridine

In the title compound, the dihedral angle between the pyridine and di­fluoro­benzene rings is 45.12 (12)°.

2,6-Di­amino-4-chloro­pyrimidine–succinic acid (2/1)

In the title 2:1 co-crystal, the complete succinic acid mol­ecule is generated by a crystallographic centre of symmetry.

(3Z,5E)-2-Amino-4,6-bis­(pyridin-3-yl)hepta-1,3,5-triene-1,1,3-tricarbo­nitrile

Hydrogen-bonded sheets occur in the centrosymmetric crystal structure of the title compound.

2,2′-Oxybis[1,3-bis­(4-meth­oxy­phen­yl)-2,3-di­hydro-1H-benzo[d][1,3,2]di­aza­borole]

The title compound features a B—O—B bond angle of 132.75 (13)°.

10-Phenyl-10H-phenoxazine-4,6-diol tetra­hydro­furan monosolvate

In the crystalline state of the title solvate, C₁₈H₁₃NO₃·C₄H₈O, hydrogen-bonding inter­actions between hydroxyl groups on a phenoxazine backbone and the tetra­hydro­furan solvent are observed that suggest the ability for this compound to act as a chelating ligand.

2,2-Bis[3,5-bis­(di­methyl­amino)­phen­yl]-1,1,1,3,3,3-hexa­methyl­tris­ilane

The mol­ecules of the title compound, C₂₆H₄₈N₄Si₃, are linked via an SiC–H⋯π(ar­yl) inter­action in the crystal.

rac-(E,trans)-4-Bromo-10,10-di­methyl-9,11-dioxabi­cyclo­[6.3.0]undec-4-ene

In the title compound, C₁₁H₁₇BrO₂, a cyclo­octene ring in a twist-boat conformation and a dioxolane ring with a distorted envelope conformation are annulated in a trans configuration. Alternating strands of single enanti­omers build up the crystal. Within the strands, the mol­ecules are connected by weak C—H⋯O hydrogen bonds.