Comment on molybdenum polyoxo clusters: from the `Blues' to the `Reds'

Molybdenum `Blues', `Browns' and the recently discovered `Reds' are unquestionably some of the most impressive nanoscale architectures in POM chemistry. In this context, Al-Sayed et al. (2022) recently made a significant contribution, reporting a new binding mode of an organic hybridization reagent in mixed-valence polyoxomolybdates.

Weaving a 2D net of hydrogen and halogen bonds: cocrystal of a pyrazolium bromide with tetra­fluoro­diiodo­benzene

In the cocrystal of the hydro­bromide of a substituted pyrazole with tetra­fluoro­diido­benzene, the bromide anion engages in both hydrogen and halogen bonds.

Hexa­methyl­ene­tetra­mine–trideca­nedioic acid (1/1): tem­per­ature-induced order–disorder structural phase transitions with phase co-existence

The structure of the 1:1 adduct of hexa­methyl­ene­tetra­mine and trideca­nedioic acid (HMT–C13) has been investigated. An order–disorder phase transition and a phase co-existence phenomenon are analysed as a function of tem­per­ature.

Step-stool conformation of a cyclic Schiff base derived from ethyl­enedi­amine and heptane-2,4,6-trione: evidence for partial hydrolysis in metal coordination

A Schiff base derived from ethyl­enedi­amine and heptane-2,4,6-trione shows two different planes, is essentially nonplanar and exhibits a `step-stool' conformation. The nonplanar nature plays an important role in metal coordination, which leads to partial hydrolysis of the ring structure.

A com­parison of three crystalline forms of miconazole: solvent-free, ethanol monosolvate and hemihydrate

Three X-ray crystal structures of miconazole are com­pared: the pure solvent-free form, the ethanol monosolvate form and the hemihydrate form. The hydrogen bonds are characterized and their role in the crystal architectures is considered from a geometric point of view and then by Hirshfeld surface and the energy framework approaches.

Crystal and mol­ecular structures of fac-[Re(Bid)(PPh₃)(CO)₃] [Bid is tropolone (TropH) and tri­bromo­tropolone (TropBr₃H)]

The crystal structures of two rhenium(I) com­plexes were determined and inter- and intra­molecular inter­actions were confirmed with solid-state NMR spectroscopy.

Solvent media as the driving force in the formation of one-dimensional silver(I) coordination polymers with 2-methyl­idene-1,3-bis­(nicotino­yloxy)propane

Reaction of silver(I) tri­fluoro­methane­sulfonate with a fluorescent ligand, namely, 2-methyl­idene-1,3-bis­(nicotino­yloxy)propane, yielded two kinds of one-dimensional sinusoidal and helical coordination polymers based on a change of solvent medium, because the flexible ligand can adopt various conformations both in solution and in the solid state.

Structural phase transition in a charge-transfer compound: tropylium hexa­fluorido­anti­monate(V)–1,4-di­methyl­naphthalene (1/1)

In-plane rotation of planar polyatomic mol­ecules in crystals can be turned on and off under tem­per­ature control. This discovery provides a new idea for the development of phase-transition functional materials.