The title compounds are two calix[4]arenes with a pinched cone conformation and one with a 1,3-alternate conformation.

The title compound, C₁₂H₁₀N₂O₃, was obtained by the de­acetyl­ation reaction of 1-(6-amino-5-nitro­naphthalen-2-yl)ethanone in a concentrated sulfuric acid methanol solution. The mol­ecule comprises a naphthalene ring system bearing an acetyl, amino and nitro groups. In the crystal, the mol­ecules are assembled into a two-dimensional network by N⋯H/H⋯N and O⋯H/H⋯O hydrogen-bonding inter­actions. n–π and π–π stacking inter­actions are the dominant inter­actions in the three-dimensional crystal packing.

In the Pd^II complex, two substituted 3-(pyridin-2-yl)-1,2,4-triazole ligands in the neutral form coordinate to the metal atom through the pyridine-N and triazole-N atoms in a trans-configuration.

In the crystal, mol­ecules are connected by C—H⋯O hydrogen bonds, forming C(8) chains running along the a-axis direction. Cohesion of the packing is provided by weak van der Waals inter­actions between the chains.

The competition between gauche and anti conformations in 2-chloro­ethyl- or 3-chloro­propyldi­methyl­ammonium cations is investigated for the title tetra­chloro­metallate salts in which the alkyl chain is found to disordered with the gauche conformation dominant.

In the crystal, mol­ecular pairs are connected by N—H⋯N hydrogen bonds, forming dimers with an (8) motif. The dimers are linked into layers parallel to the (10) plane by N—H⋯O hydrogen bonds. In addition, C—O⋯π and C—Br⋯π inter­actions connect the mol­ecules, forming a three-dimensional network.

Very large high-quality crystals of a new member of the family of double nitrates, namely, [La(NO₃)₆]₂[Ni(H₂O)₆]₃·6H₂O, were crystallized in large amounts. The structure was determined via single-crystal X-ray diffraction to high resolution. Extensive structural information, including hydrogen-bonding details, was obtained at the same time.

This study presents two anhydrous polymorphic forms of psilocin, detailing their crystal structures and hydrogen-bonding differences, with Form II introducing a novel conformation and whole-mol­ecule disorder.

The title multi-component crystal, [Cu(NH₃)₅]Cl₂·CO(NH₂)₂, was synthesized from a deep eutectic solvent to yield an unusual penta­amine­copper(II) complex. Hydrogen bonding takes place between chloride ions and both the penta­amine­copper ions and urea mol­ecules.

In the title mol­ecule, the benzimidazole entity is almost planar (r.m.s. deviation = 0.0262 Å), while the triazole ring is oriented almost perpendicular to the benzimidazole ring. In the crystal, bifurcated C—H⋯O hydrogen bonds link individual mol­ecules into layers extending parallel to the ac plane.

The crystal structure of LiLu[MoO₄]₂, which emerged as a by-product of the synthesis to obtain lithium derivatives of lutetium molybdate, adopts the scheelite type.

In the title compound, the di­hydro­quinoxaline units are both essentially planar and the dihedral angle between their mean planes is 64.82 (2)°. In the crystal, C—H⋯O hydrogen bonds form chains along the b-axis direction which are joined by π-stacking and C—H⋯π(ring) inter­actions into the full three-dimensional network structure.

In the crystal, the mol­ecules are connected into dimers by C—H⋯O hydrogen bonds with (8) ring motifs, forming zigzag ribbons along the b-axis direction.

The reaction between lithium hexa­methyl­disilazane, [Li{N(Si(CH₃)₃)₂}] (LiHMDS), with 4,4-dimethyl-2-phenyl-2-oxazoline (Phox) in hexane produced the title complex [Li{N(Si(CH₃)₃)₂}(Phox)₂]. The mol­ecule, which crystallizes in the C2/c space group, lies on a twofold rotation axis and the lithium cation adopts a trigonal–planar coordination environment by the coordination, through nitro­gen atoms, of one unit of hexa­methyl­disilazane and two units of Phox, both ligands in a monodentate mode.