journal menu
issue contents
November 2023 issue
Cover illustration: A new pyrrole–pyrazole hybrid, synthesized through a citric acid-catalyzed Paal–Knorr reaction, presents a crystal structure controlled by C—H⋯π and dispersion forces. Despite the weak interactions, the solid shows thermal stability. See Moreno-Suárez, Avila-Acosta, Sánchez-Ramírez, Castillo & Macías [Acta Cryst. (2023), C79, 472–479].
scientific commentaries
Open 
access
access
There is a need for validation methods to ensure the quality and consistency of reported data, but a recent article by Raymond and Girolami [Acta Cryst. (2023), C79, https://doi.org/10.1107/S2053229623007088] will alert chemists, crystallographers, referees, and editors to not always trust the crystal structure but also to ensure that the chemistry is consistent with previous chemistry.
topical reviews
Open access
access
Although analysing crystallographic results with available software tools can catch many types of errors, others can be detected only by combining knowledge of both crystallography and chemistry. We discuss several such examples from the published literature, and for each of them we identify what lessons they teach us.
research papers
Download citation
Download citation
Open access
access
An unprecedented example of an anionic (arene)copper complex has been prepared and structurally characterized in the salt [K(THF)2]2[Cu2(anthracene)2] (THF is tetrahydrofuran), which contains the first homoleptic anthracene complex of a d- or f-block metal bound only to the central ring of anthracene.
CCDC reference: 2296812
Download citation
Download citation
Single crystals of Ba2YAlO5 and of the α and β phases of Ba6Y2Al4O15 suitable for X-ray structural analysis were obtained via grain growth of polycrystalline samples prepared by solid-state reactions. In each of these compounds, BO6 octahedra in ABO3 perovskite-type structures were replaced by AlO4 tetrahedra and YO6 octahedra. Polycrystalline samples in which some Y atoms were replaced with Eu exhibited orange–red luminescence.
Download citation
Download citation
A new pyrrole–pyrazole hybrid, synthesized through a citric acid-catalyzed Paal–Knorr reaction, presents a crystal structure controlled by C—H⋯π and dispersion forces. Despite the weak interactions, the solid shows thermal stability.
CCDC reference: 2302406
Download citation
Download citation
5-[(Dimethylamino)methylidene]-4-{[3-(trifluoromethyl)phenyl]amino}-1,3-thiazol-2(5H)-one and the [4-(trifluoromethyl)phenyl]amino derivative, with the trifluoromethyl group at the arene ring in the meta and para positions, were synthesized to study the structural changes occurring on prototropic tautomerism of the amidine system. Both isomers exist in the liquid and solid phases in the amino tautomeric form.
