Hydrogen bonding between aromatic H and F groups leading to a stripe structure with R- and S-columns: the crystal structure of (2,7-di­meth­oxy­naphthalen-1-yl)(3-fluoro­phenyl)methanone and comparison with its 1-aroyl­naphthalene analogues

In the title compound, each of the R- and S-isomers are stacked into columns by C—H⋯O=C hydrogen bonds between the benzene rings and the carbonyl groups. The columns of one enantio­mer are connected with the counterpart isomeric columns by C—H⋯F hydrogen bonds between the meth­oxy groups and the F atom of the aroyl groups to yield a stripe structure.

Synthesis, crystal structure and spectroscopic properties of trans-di­bromidobis(2,2-di­methyl­propane-1,3-di­amine-κ²N,N′)chromium(III) perchlorate

Three symmetrically independent complex molecules have a similar conformation, with two chelating Me₂tn (2,2-dimethylpropane-1,3-diamine) ligands in an anti conformation coordinating a Cr^III centre in the equatorial plane, and two Br atoms in the axial positions of a distorted octahedron. The packing is stabilized by hydrogen bonds between the amino groups of the Me₂tn ligands as donors and the Br ligands and perchlorate counter-ion O atoms as acceptors.

4,4′-Bi­pyridine-1,1′-diium acetylenedi­carboxylate: a new member of the (H₂bipy)[Cu(ox)₂] (bipy is 4,4′-bi­pyridine and ox is oxalate) family

4,4′-Bipyridine-1,1′-diium acetylenedicarboxylate, a one-dimensional structure with alternating cations and anions, is a new member of the (H₂bipy)[Cu(ox)₂] family reported earlier. The supramolecular isostructurality is ascribed to the synergistic effect of multiple interactions in the structures, including strong charge-assisted N—H⋯O hydrogen bonds, C—H⋯O contacts and π–π interactions.

Two different products from the reaction of 1-aryl-5-chloro-3-methyl-1H-pyrazole-4-carb­aldehyde with cyclo­hexyl­amine when the aryl substituent is phenyl or pyridin-2-yl: hydrogen-bonded sheets versus dimers

1-Aryl-5-chloro-3-methyl-1H-pyrazole-4-carbaldehydes react with cyclo­hexyl­amine by nucleophilic substitution when the aryl substituent is pyridin-2-yl to give 5-cyclo­hexyl­amino-3-methyl-1-(pyridin-2-yl)-1H-pyrazole-4-carbaldehyde, and by condensation followed by hydrolysis when the aryl substituent is phenyl to give (Z)-4-[(cyclo­hexyl­amino)­methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one.

A novel two-dimensional cadmium(II) complex: poly[di­aquatris(μ₄-cyclo­hexane-1,4-di­carboxyl­ato)bis­[2-(pyridin-4-yl)-1H-benzimidazole]tri­cadmium(II)

A novel two-dimensional cadmium(II) coordination polymer is composed of one-dimensional [Cd₃(e,e-trans-1,4-chdc)₂(4-PyBIm)₂(H₂O)₂]_n chains [4-PyBIm is 2-(pyridin-4-yl)-1H-benz­imidazole and 1,4-chdc²⁻ is cyclo­hexane-1,4-di­carb­oxy­late] joined by e,a-cis-1,4-chdc²⁻ ligands.

A di­hydrogen phosphate anionic network as a host lattice for cations in 1-methyl­piperazine-1,4-diium bis­(di­hydrogen phosphate) and 2-(pyridin-2-yl)pyridinium di­hydrogen phosphate–ortho­phosphoric acid (1/1)

Di­hydrogen phosphate anions show a supra­molecular flexibility depending on the nature of the cations and may be suitable for the design of the host lattice for host–guest supra­molecular systems. In the salt 1-methyl­piperazine-1,4-diium bis­(di­hydrogen phosphate) and the solvated salt 2-(pyridin-2-yl)pyridinium di­hydrogen phosphate–ortho­phosphoric acid (1/1), the formation of O—H⋯O and N—H⋯O hydrogen bonds between the di­hydrogen phosphate anions and the cations constructs a three- and two-dimensional anionic–cationic network, respectively.

Carbonyl–carbonyl inter­actions and amide π-stacking as the directing motifs of the supra­molecular assembly of ethyl N-(2-acetyl­phenyl)oxalamate in a synperiplanar conformation

The phenyl­oxalamate group has become a particularly important and versatile supra­molecular building block in the context of conformationally controlled mol­ecular clefts.

(2-Amino­pyrimidine-κN¹)aqua(pyridine-2,6-di­carboxylato-κ³O²,N,O⁶)copper(II): X-ray and DFT calculated structure

The structure of (2-aminopyrimidine-κN¹)aqua(pyridine-2,6-dicarboxylato-κ³O²,N,O⁶)copper(II) is compared with three similar previously reported compounds. Close Cu⋯X_bridged (X = N or O) contacts are present between potentially ligating atoms from neighbouring molecules and the Cu^II centre. Bond-order indices have been employed to elucidate the degree of covalency in these interactions and its implications for the effective coordination number of the transition metal atom.

Expanding the structural landscape of niclosamide: a high Z′ polymorph, two new solvates and monohydrate H_A

Crystal structures are reported for a new polymorph of the drug niclosamide, together with acetone and acetonitrile solvates and the monohydrate polymorph H_A.

The first structurally analysed nucleic acid building block containing the Reese protecting group: 2′-O-[1-(2-fluoro­phen­yl)-4-meth­oxy­piperidin-4-yl]-β-D-(1′R,2′R,3′R,4′R)-uridine

Mol­ecules of a substituted β-D-uridine are assembled by N—H⋯O and O—H⋯O hydrogen bonds into well-separated two-dimensional layers of about 15 Å thickness. The crescent conformation of the mol­ecules is stabilized by weak intra­molecular C—H⋯O and C—H⋯F hydrogen bonds. The endocyclic uracil bond lengths imply a considerable degree of delocalization of the electron density within the ribo­furan­ose ring.

A square-planar tellurium(II) complex with Te,Te′-chelating ligands

A centrosymmetric Te^II complex supported by ditelluridoimidodiphosphinate ligands has been structurally characterized. This compound is the first all-tellurium member of a series of related square-planar E^II(E′)₄ complexes (E and E′ are group 16 elements).

The crystal and mol­ecular structure of sodium 4-(2,4,6-triiso­propyl­benzo­yl)benzoate in terms of the photochemical behaviour of the anion

All known 4-(2,4,6-triiso­propyl­benzo­yl)benzoate salts are photochemically active in the crystalline state. The lack of photochemical reactivity for the sodium salt is explained on the basis of inter­molecular inter­actions and the mol­ecular geometry in the crystals.

L-Argininium phosphite – a new candidate for NLO materials

The new potential NLO (nonlinear optical) material L-argininium phosphite was obtained from a 1:1 solution of L-arginine and phospho­rous acid. The composition of the product obtained from the 1:2 solution is proposed on the basis of spectroscopic data.

Corrigenda for four articles

Corrigenda for four articles.