Bis[di­hydro­bis­(pyrazol-1-yl-κN²)borato]bis­(methanol-κO)iron(II)

In the crystal structure of the title compound, the iron(II) cations are sixfold coordinated by two methanol mol­ecules and four N atoms of two bis­(pyrazol­yl)borate dianions, forming slightly distorted octa­hedral discrete complexes.

(−)-Sparteinium tetra­chlorido­zincate monohydrate

In the title compound, the tetra­chlorido­zincate ion, [ZnCl₄]²⁻, presents a geometry close to tetra­hedral, unlike the [CuCl₄]²⁻ anion in the isostructural compound previously reported.

(Bi­phenyl-2,2′-di­yl)[1,3-bis­(di­phenyl­phosphan­yl)propane-κ²P,P′]platinum(II)

The single-crystal structure of (biphenyl-2,2-di­yl)[bis­(di­phenyl­phosphan­yl)propane)­platinum(II) is compared to that with a methyl group bridging two diphenyl phosphine donor groups and to another lacking a C—C bond between two coordinating phenyl groups.

Bis(tri­ethyl­ammonium) tetra­bromido­zincate

The title mol­ecular salt consists of a tetra­hedral tetra­bromido­zincate dianion and two tri­ethyl­ammonium cations linked by N—H⋯Br hydrogen bonds.

(18-Crown-6-κ⁶O){(tri­methyl­sil­yl)[6-(tri­methyl­silyl­amino)­pyridin-2-yl-κN¹]aza­nido-κN}potassium(I)

A K⁺ cation is coordinated to a monoanionic 2,6-bis­(tri­methyl­silyl­amino)­pyridine and an 18-crown-6 macrocycle. The complex forms a monomer unlike other related complexes of potassium with similar tri­alkyl­silyl­pyridine ligands and crown ethers.

Bis(methanol-κO)bis­{5-(pyridin-2-yl-κN)-3-[4-(pyridin-4-yl)phen­yl]-1H-1,2,4-triazol-1-ido-κN¹}cobalt(II)

The synthesis and crystal structure of a centrosymmetric Co^II complex with a triazole-based ligand are reported.

(η²,η²-Cyclo­octa-1,5-diene)[2-(di­phenyl­phos­phanyl­meth­yl)pyridine-κ²N,P]rhodium(I) tetra­fluorido­borate 1,2-di­chloro­ethane monosolvate

The triclinic polymorph of [Rh(COD)(dppmp)]BF₄ is presented.

6-Methyl-7H-1,2,4-triazolo[4,3-b][1,2,4]triazepin-8(9H)-thione

In 6-methyl-7H-1,2,4-triazolo[4,3-b][1,2,4]triazepin-8(9H)-thione, the triazepine ring displays a boat conformation. In the crystal, mol­ecules are linked into centrosymmetric dimers by N—H⋯N hydrogen bonds.

Bis(2-amino-6-methyl­pyridinium) 3-nitro­benzene-1,2-di­carboxyl­ate

The cations are protonated at the pyridine N atoms. The cations and anions are linked by weak N—H⋯O, C—H⋯O hydrogen bonds and π–π inter­actions. In the crystal, N—H⋯O hydrogen bonds link the anions and cations into a two-dimensional network parallel to (10).

(7R)-6-Methyl-7,9-bis­(prop-2-yn-1-yl)-7H,8H,9H-1,2,4-triazolo[4,3-b][1,2,4]triazepin-8-one

The title triazepine derivative features a seven-membered ring having a boat conformation, while the fused five-membered ring is almost planar.

4-Bromo-N-(4-fluoro­phen­yl)benzene­sulfonamide

In 4-bromo-N-(4-fluoro­phen­yl)benzene­sulfonamide, the dihedral angle between the planes of the two aromatic rings is 41.17 (19)°. In the crystal, N—H⋯O(S) hydrogen bonds between the mol­ecules form infinite one-dimensional C(4) chains along [001]. These chains are inter­connected via short F⋯F contacts [F⋯F = 2.868 (4) Å], forming a one-dimensional ribbon-like architecture.

N-(Pyrazin-2-yl)adamantane-1-carboxamide

Adamantane compounds have received considerable inter­est from the pharmacological community owning to their anti­viral activity. N-(Pyrazin-2-yl)adamantane-1-carboxamide is composed of an adamantine unit and a pyrazine ring connected to each other through the amide bond. In the crystal, mol­ecules are arranged in a herringbone fashion.

(Z)-3-Allyl-5-(4-fluoro­benzyl­idene)-2-sulfanyl­idene­thia­zolidin-4-one

In the title compound, the sulfanyl­idene­thia­zolidine ring and the benzyl­idene ring are almost coplanar, making a dihedral angle of 0.1 (2)° while the mean plane through the allyl group subtends a dihedral angle of 69.5 (5)° with the sulfanyl­idene­thia­zolidine ring.

5-(2-Hy­droxy-5-meth­oxy­benzo­yl)-1-methyl-3-nitro­pyridin-2(1H)-one

In the title nitro­pyridine derivative, the dihedral angle between the benzene and pyridine rings is 65.90 (7)°. In the crystal, mol­ecules are linked by O—H⋯O hydrogen bonds, forming chains propagating along [10].

N-{(Z)-3-Oxo-3-[(E)-(pyridin-2-ylmeth­yl)diazen­yl]-1-(thio­phen-2-yl)prop-1-en-2-yl}benzamide

The title compound is primarily a hydrazone formed by the reaction of a precursor hydrazide with pyridine-2-aldehyde. However, it rearranges to a diazo derivative by a 1,3 proton shift. The mol­ecule has an E conformation about the N=N bond and a Z conformation about the C=C bond.

1,1′-Bi­phenyl-2,2′,5,5′-tetra­carb­oxy­lic acid

Crystals of 1,1′-biphenyl-2,2′,5,5′-tetra­carb­oxy­lic acid (H₄bptc) were obtained under hydro­thermal conditions. The mol­ecules are connected through inter­molecular hydrogen bonds, leading to the formation of a two-dimensional supra­molecular network.

4-Chloro-N-(isoquinolin-3-yl)butanamide

The iso­quinoline moiety is oriented at an angle of 12.0 (2)° with respect to the chloro­butanamide moiety. In the crystal, mol­ecules are linked via N—H⋯N and C—H⋯O hydrogen bonds which form (8) and (16) graph-set dimers.

2-Amino-4-methyl­pyridinium 2-(4-nitro­phen­yl)acetate

The crystal structure of the salt 2-amino-4-methyl­pyridinium 2-(4-nitro­phen­yl)acetate features N—H⋯O hydrogen bonds, C—H⋯O contacts and C—H⋯π and π–π inter­actions.

Tetra­kis(di­meth­oxy­bor­yl)methane

The mol­ecules of tetra­kis­(di­meth­oxy­bor­yl)methane, which reside on sites of crystallographic twofold symmetry, have idealized point symmetry like most other CX₄ mol­ecules in which each X group bears two non-H substituents at the 1-position.

2-(2-Amino-1,3-thia­zol-4-yl)acetohydrazide

The dihedral angle between the acetohydrazide moiety and the thia­zole ring is 80.96 (8)°. In the crystal, mol­ecules are linked by N—H⋯O and N—H⋯N hydrogen bonds generating (010) sheets.

(E)-3-(2,5-Di­fluoro­phen­yl)-1-phenyl­prop-2-en-1-one

The title chalcone derivative was obtained by a Claisen–Schimdt condensation in basic solution of ethanol–water between 2,5-di­fluoro­benzaldehyde and aceto­phenone. The structure is almost planar, with the dihedral angle between the planes of the benzene and phenyl rings being 7.45 (9)°.

Tris(4-meth­oxy­phen­yl)phosphine selenide

The P atom in tris­(4-meth­oxy­phen­yl)phosphine selenide is in a distorted tetra­hedral environment. The torsion angles of the phenyl rings relative to the P=Se bond are 35.62 (10), 35.07 (13), and 44.50 (11)°.

2-Amino-3-methyl­pyridinium 3,4-di­meth­oxy­benzoate

The cation is protonated at the pyridine N atom; in the crystal [010] chains linked by N—H⋯O hydrogen bonds occur.

1,2,3,5-Tetra­methyl-1H-pyrazol-2-ium triiodide

1,2,3,5-Tetra­methyl­pyrazolium triiodide was obtained unintentionally by methyl­ation of 3,6-bis­(3,5-di­methyl­pyrazol-1-yl)-1,2,4,5-tetra­zine and subsequent fragmentation. The pyrazolium ring is almost planar and the triiodide anion deviates slightly from linearity.

10-Methyl-10H-pheno­thia­zine

In the title pheno­thia­zine derivative, the dihedral angle between the two outer aromatic rings of the pheno­thia­zine unit is 39.53 (10)°. π–π inter­actions are observed between the aromatic rings of neighbouring mol­ecules.

N′-[(1E)-4-Hy­droxy-3-meth­oxy­benzyl­idene]isonicotinohydrazide monohydrate

In the title compound, the dihedral angle between the pyridine and benzene rings is 2.52 (9)°. In the crystal, O—H⋯O, O—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds link the components into a three-dimensional network.

N,N′-Bis(pyridin-2-yl)octa­nedi­amide

The complete mol­ecule of N,N′-bis­(pyridin-2-yl)octa­nedi­amide is generated by crystallographic inversion symmetry. In the crystal, N—H⋯N hydrogen bonds connect the mol­ecules into [010] chains, which feature (8) loops. The packing is consolidated by C—H⋯O inter­actions.

Allyl 3,4,6-tri-O-acetyl-2-de­oxy-2-phthalimido-β-D-gluco­pyran­oside

Allyl 3,4,6-tri-O-acetyl-2-de­oxy-2-phthalimido-β-D-gluco­pyran­oside, a useful inter­mediate in oligosaccharide synthesis, was prepared and analyzed by X-ray crystallography, confirming the β-anomeric configuration and showing an approximately orthogonal orientation of the phthalimido group with respect to the pyran­ose ring.

4-[5-(Benzo­furan-2-yl)-1-phenyl-1H-pyrazol-3-yl]-N,N-di­methyl­aniline

In the title compound, the dihedral angles between the pyrazole ring and its phenyl, aniline and benzo­furan substituents are 47.64 (8), 4.00 (8) and 29.12 (7)°, respectively. In the crystal, aromatic π–π stacking between the pyrazole rings generates inversion dimers.