Dicaesium tetra­magnesium penta­kis­(carbonate) deca­hydrate, Cs₂Mg₄(CO₃)₅·10H₂O

The title compound, which formed twinned crystals, represents a highly hydrated carbonate with an unprecedented composition. Its unique crystal structure consists of a complex arrangement of anionic building units centred by octa­hedrally coordinated magnesium ions, caesium cations and free water mol­ecules.

N-[(E)-Quinolin-2-yl­methyl­idene]-1,2,4-triazol-4-amine hemihydrate

In the title hemihydrate, the Schiff base mol­ecule adopts an E configuration about the C=N bond and is approximately planar, with a dihedral angle between the quinoline ring system and the 1,2,4-triazole ring of 12.2 (1)°. In the crystal, one water mol­ecule bridges two Schiff base mol­ecules via O—H⋯N hydrogen bonds.

Hydro­nium bis­(tri­fluoro­methane­sulfon­yl)amide–18-crown-6 (1/1)

The structure of the title compound, [H₃O⁺·C₁₂H₂₄O₆][N(SO₂CF₃)₂⁻], known as an ionic liquid (m.p. 341 −343 K), has been determined at 113 K. One hydro­nium ion is complexed with an ordered 18-crown-6 mol­ecule with H₂OH⋯OC distances of 1.90–2.19 Å, and another hydro­nium ion with a disordered 18-crown-6 mol­ecule with distances of 1.85–2.36 Å.

(3S,5R,6S)-Di­phenyl­methyl 1-oxo-6-bromo­penicillanate

In the title compound, C₂₁H₂₀BrNO₄S, a key inter­mediate in the synthesis of the widely used β-lactamase inhibitor tazobactam, the five-membered thia­zolidine ring adopts an envelope conformation and the four-membered azetidine ring is in a distorted planar conformation.

5-Methyl-4-(5-methyl-3-oxo-2-phenyl-2,3-di­hydro-1H-pyrazol-4-yl)-2-phenyl-1H-pyrazol-3(2H)-one

The crystal structure of bis­pyrazolone, recrystallized from DMSO, indicates that the enamine tautomer is favored.

2,2′-[Methyl­enebis(sulfanedi­yl)]bis­(pyridine 1-oxide)

In the title compound, the two pyridine n-oxide moieties are tethered by a bis-thio­ether group.

2-(Octa­decyl­sulfan­yl)-1,3-thia­zole

The title compound crystallizes with a linear alkyl chain bound to the sulfur atom at the 2-position of the thia­zole ring.

5-Nitro-2,3-bis­(thio­phen-2-yl)quinoxaline

The structure of a nitro-bis­(thio­phen-2-yl)quinoxaline has been determined at 298 K.

6-Nitro-2,3-bis­(thio­phen-2-yl)quinoxaline

The structure of the title nitro­bis­(thio­phen-2-yl)quinoxaline has been determined at 298 K.

1,4-Bis­(4-meth­oxy­phen­yl)naphthalene

Two independent mol­ecules comprise the asymmetric unit of the title naphthalene derivative, which exhibit very similar conformations. The pendant 4-methyoxybenzene rings are splayed out of the plane through the naphthalene ring system.

6-[(tert-Butyl­dimethyl­sil­yl)­oxy]-3-ethenyl-7-meth­oxy-4-[(tri­methyl­sil­yl)ethyn­yl]naphtho­[2,3-c]furan-1(3H)-one

In the mol­ecule of the title compound, the tricyclic core, consisting of a naphthalene entity fused together with a furan ring, deviates slightly from planarity.

2-Amino­anilinium 4-methyl­benzene­sulfonate

In the extended structure of the title mol­ecular salt, the cations and anions are linked by N—H⋯O hydrogen bonds to generate [010] chains.

1,3-Bis(2-oxoprop­yl)thymine

In the title compound, C₁₁H₁₄N₂O₄, the two 2-oxopropyl groups are nearly perpendicular to the planar thymine unit. One methyl group of the oxopropyl substituent is disordered. In the crystal, C—H⋯O inter­actions help to connect the mol­ecules into (001) layers.

[(1R*,3S*,4S*)-3-(2-Hy­droxy­benzo­yl)-1,2,3,4-tetra­hydro-1,4-ep­oxy­naphthalen-1-yl]methyl 4-nitro­benzoate

The relative stereo- and regiochemistry of the title compound, C₂₅H₁₉O₇N, were determined by the X-ray analysis.

[SP-4-2]-(Aceto­nitrile-κN)chlorido­[2-(4,6-di­phenyl­pyridin-2-yl)phenyl-κ²C¹,N]platinum(II). Corrigendum

Withdrawal of IUCrData (2019), 4, x191207.