issue contents

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206

February 2024 issue

Highlighted illustration

Cover illustration: In this issue, McMonagle et al. [Acta Cryst. (2024), B80, 13–18] discuss the lattice response to radiation damage of molecular crystals. The image is an overlay of the crystal structure of Hg(NO3)2(PPh3)2 and the corresponding section of the thermal and radiative expansivity indicatrices. The eigenvectors of the expansion are shown in black, and thermal and radiative expansion are shown in blue and red, respectively. The magenta line indicates a negative radiative expansion.

scientific commentaries


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The structural strain induced by temperature (`phonon pressure') and radiation damage (`defect pressure') is not necessarily correlated because of different underlying structural mechanisms. Here synchrotron experiments may provide new and yet unexplored opportunities. A recent publication by McMonagle et al. [(2024), Acta Cryst. B80, 13–18] is an excellent illustration of this.

research papers


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The use of encapsulated nanodroplet crystallization, for high-throughput screening of a selection of di­hydro­pyridine active pharmaceutical ingredients, resulted in access to single component crystalline forms for all examples as well as the discovery of two novel solvates.

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The interaction of intense synchrotron radiation with molecular crystals frequently modifies the crystal structure by inducing disorder. A second-rank tensor of radiation-induced lattice strain is proposed to characterize lattice susceptibility to the radiation.

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Lowering the flexibility of a dipodal N-donor ligand containing a benzene ring as a spacer, by increasing the number of methyl substituents, promotes the syn conformation of the ligand, which is required to obtain dinuclear, cyclic metal complexes.

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Two concomitant polymorphs of 2-imino­coumarin-3-carboxamide were crystallized and studied. They have different crystal structures from the energetic viewpoint and proved to be stable to the external factors.

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The crystal structure of zharchikhite, AlF(OH)2, is solved here. Zharchikhite exhibits a novel structure type roughly related to α-PbO2 structure type.

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An important direction of modern chemistry is the use of di­carb­oxy­lic organic acids with a rigid backbone as linker molecules for the synthesis of coordination polymers. As linker molecules, the derivatives of salicylic acid would have an advantage due to the undoubtedly stronger bonding with the metal cation due to formation of chelate complexes.
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