In the title compound, [24]di­thia­amethyrin(1.0.0.1.0.0); C₅₀H₄₄Cl₄N₄S₂, the macrocycle can be described as a highly planar structure with a mean-plane deviation (MPD) value of 0.0416 Å. The mol­ecular conformation is stabilized by two intra­molecular N—HN inter­actions. In the crystal, mol­ecules are also linked via C—Hπ inter­actions forming a three-dimensional network.

The metallacrown compound, Ni^II(OAc)₂[12-MC_{Mn(III)N(shi)}-4](CH₃OH)₆·2CH₃OH·H₂O, where MC is metallacrown, shi³⁻ is salicyl­hydroximate, and ⁻OAc is acetate, has an overall square shape that captures an Ni^II ion in a central cavity while the ring of the metallamacrocycle contains four Mn^III ions. Two acetate anions, which are located on opposite faces of the MC, form bridges between the central Ni^II ion and two of the ring Mn^III ions.

The crystal structure of a valinomycin complex with an encapsulated [Mg(H₂O)₆]²⁺ ion as an independent structural unit is described. The new cation-binding mode exhibited by valinomycin, a cyclic dodecadepsipeptide, occurs via hydrogen bonds from the coordinated water mol­ecules of the hexa­hydrate cation, instead of via direct links to the cation. The inter­action of the [Mg(H₂O)₆]²⁺ ion with the cyclic polypeptide has important implications for the study of metal binding with biological models under physiological (aqueous) conditions.

Deprotonation of an ionogenic tetra­dentate bipyridine ligand resulted in the synthesis of a rare octa­coordinated anionic mononuclear iron(III) com­plex. An investigation of the mag­netic properties revealed a gradual incom­plete spin-crossover behaviour below 150 K.

The crystal of the first title compound contains five-coordinate [Zn(L)I]⁺ (L = cyclam) cations and non-coordinated iodide anions; the extended structure is consolidated by N—HI and N—H(I,I) hydrogen bonds. The crystals of the second title compound consist of chains of [Zn(L)I]⁺ units and triiodide counter-ions but without significant hydrogen-bonding inter­actions.

The coordination polyhedra of the zinc(II) ions in the complex cation and the anion of the title compound, viz. trans-ZnN₄O₂, are distorted octa­hedra. In the crystal, the hydrogen-bonding inter­actions between the N—H groups of the tetra­amine, the acidic groups of the anion and coordinated water mol­ecules result in formation of one-dimensional tapes running along the [10] direction, which are further arranged in sheets lying parallel to the (001) plane.

This compound was prepared by bromination/de­hydro­bromination of E,E,Z-cyclo­dodeca­triene. The crystal is composed of C₂-symmetrical mol­ecules with an E conformation of the bromo­alkene fragments and nearly linear alkyne units. The torsion angles in the ring suggest significant ring strain.

The title coordination polymer consists of parallel zigzag-like chains of [Ni(cyclam)]²⁺ cations bridged by the dianions of the acid in the axial positions of the trans-NiN₄O₂ coordination polyhedron. Polymeric chains propagating along the [101] direction are assembled into a three-dimensional network by O—HO hydrogen bonds.

The behaviour under compression of a series of six isomorphous coordination complexes [MX₂(1,4,7-trithiacyclononane)] (M = Pd, Pt; X = Cl, Br, I) is reported. The different structural properties of these complexes are described and analysed, including by the use of density functional theory (DFT) and bond-order calculations.

Reversible solvent-triggered single-crystal-to-single-crystal transformations are observed between two copper(II) aza­macrocyclic complexes and characterized by single-crystal X-ray diffraction and in situ powder X-ray diffraction.