issue contents

ISSN: 2052-5206

June 2023 issue

Highlighted illustration

Cover illustration: Natural tiling of the 44T8-CA superhard allotrope of carbon. [52.64], [62.72] and two geometrically different [6.72] tiles are highlighted in blue, green, red and yellow, respectively. The tiles are glued into layers via six-membered rings, whereas the layers are united through five- and seven-membered rings [Kabanov et al. (2023). Acta Cryst. B79, 198–206].

scientific commentaries

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The study of azoproite by Biryukov et al. [Acta Cryst. (2022), B78, 809–816) continues the systematic and complex investigation of the crystal structures, temperature behavior and magnetic properties of natural oxoborates.

research papers

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A novel approach is proposed for the description of possible reconstructive solid-state transformations, which is based on the analysis of topological properties of atomic periodic nets and relations between their subnets and supernets. This approach is applied to generate 72 new carbon allotropes from the initial experimentally determined crystalline carbon structures and to reveal four allotropes whose hardness is close to diamond.

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The crystal structure model of intercalate NH4Cl·As2O3·0.5H2O is revised and the compound is shown unequivocally by X-ray diffraction and 15N solid-state NMR to be isostructural with KCl·As2O3·0.5H2O.

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The synthesis and structural characterization (XRD and NMR) of two new trans-platinum complexes are presented.

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Three 5-di­methyl­amino­methyl­idene-4-phenyl­amino-1,3-thia­zol-2(5H)-ones with an OH group in ortho-, meta- and para- positions on the phenyl ring were synthesized to study the structural changes occurring on prototropic tautomerism of the amidine system. All isomers exist solely in the amino tautomeric form.

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The crystal structures of several polymorphic systems are analyzed via a method for the visualization of the variation of noncovalent contacts. Some new correlations were discovered which cannot be obtained by other methods.

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The unique phase in a tri­phenyl­silanol crystal induced by flash cooling is presented. Subsequently, gradual heating of the crystal leads to its original phase. The crystal is robust and the observed phase transformation is reversible on many consecutive flash cooling/heating cycles.
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