Ionic liquid-assisted synthesis, crystal structures, and electronic structure characterization of novel hybrid organic–inorganic chloride com­pounds [BMIm]_m[MCl_n] (M = Cd, Se, Sn, Bi; n = 4, 6; m = 2, 3)

Four ionic-liquid-derived hybrid chloride salts containing 1-butyl-3-methyl­imidazolium, [BMIm]⁺, cations and isolated [CdCl₄]²⁻, [SeCl₆]²⁻, [SnCl₆]²⁻, and [BiCl₆]³⁻ anions were structurally characterized, and electronic structure calculations yield calculated band gaps ranging from 2.91 to 4.44 eV.

Analysis of lattice changes and weak inter­actions in a series of sol­vato­morphic isostructural spin-crossover com­pounds

Five new sol­vato­morphic spin-crossover com­pounds were crystallized and structurally characterized. Variable-tem­per­a­ture X-ray diffraction, Hirshfeld surface analysis and NCI plots shed light on the role of weak inter­actions.

Neutron diffraction investigation of the crystal structure of ammonium molybdate tetra­hydrate

The crystal structure of ammonium molybdate tetra­hydrate was investigated using time-of-flight neutron diffraction. Three of the six ammonium ions exhibited hy­dro­gen-site disorder in the asymmetric unit, which was correlated with the surrounding hy­dro­gen-bonding network.

Contrasting interpenetration in two isoreticular MOFs with bridged layers: role of 2D layer packing density in 3D catenation

Comparative single-crystal structural analysis of two isoreticular MOFs uncovers a counterintuitive relationship in inter­penetration hierarchy. In the Cd-based framework, twofold inter­penetrated 2D layers are densely packed, which blocks 3D catenation, whereas loosely packed Co-based layers permit extensive 3D inter­penetration. The study establishes that metal–node geometry governs the packing density of 2D layers, which in turn determines the ultimate 3D topology and solvent-accessible void volume.

Transition-metal com­pounds of the form catena-poly[[di­aqua­bis­(3-methyl­pyridine-κN)M^II]-μ-sulfato-κ²O:O′], where M = Mn, Co, Ni, Cu, Zn, and Cd

The crystal structures of six transition-metal com­pounds of the form [M(SO₄)(C₆H₇N)₂(H₂O)₂]_n are pre­sent­ed, where M = Mn, Co, Ni, Cu, Zn, and Cd. The isostructural com­pounds form infinite chains of octa­hedral metal centres bridged by sulfate anions. Two chains are joined together through hy­dro­gen bonds to form infinite double chains in each structure.

Copper and cobalt com­plexes with famotidine

The structures of a famotidine–copper(II) chloride com­plex and a famotidine propionic acid–cobalt(II) tetra­chloride are reported. These com­pounds have implications in the colorimetric measurements on Paper-Based Analytical Devices (PADs).