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June 2022 issue
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Cover illustration: In the cocrystal of the hydrobromide of a substituted pyrazole with tetrafluorodiidobenzene, the bromide anion engages in both hydrogen and halogen bonds. See van Terwingen, Ebel & Englert [Acta Cryst. (2022), C78, 324–331].
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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.
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In the cocrystal of the hydrobromide of a substituted pyrazole with tetrafluorodiidobenzene, the bromide anion engages in both hydrogen and halogen bonds.
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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.
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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.
CCDC reference: 2166693
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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.
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The crystal structures of two rhenium(I) complexes were determined and inter- and intramolecular interactions were confirmed with solid-state NMR spectroscopy.
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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.
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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.