Seven venetoclax solvates were structurally characterized and studied for their desolvation behaviour, leading to the identification of two solvent-free polymorphs. Advanced crystallographic and computational analyses, including Solvate Analyser, CSD-Particle, FTIR and solid-state NMR, revealed key factors governing solvate stability and transformation. Notably, the acetone solvate exhibited exceptional stability and the desolvated forms retained the molecular arrangement of their parent solvates.

Structural analysis of the co-crystal between human DNA glycosylase hOGG1 and a light-sensitive substrate analog highlights its utility as a platform for real-time observation of catalytic dynamics.

We demonstrate the application of a nitric oxide releasing photocage system for time-resolved serial crystallography studies of two heme containing proteins using a fixed target sample delivery system. Optimal parameters for successful photocage activation and nitric oxide release are explored.

Electron cryo-tomography of ATP synthase dimers in plant mitochondria indicates a wide dimer angle and a plant-specific subunit in the peripheral stalk.

A new satellite is discovered in the manganese Kβ spectrum using extended-range high-energy-resolution fluorescence detection. Advanced insights on its structure and evolution are extracted with principal component analysis.

Selective nuclear spin reversal by the method of adiabatic fast passage is a way to order a system of dynamically polarized nuclei. Using polarized neutron scattering, it increases the visibility of sources and sinks of proton polarization in radical proteins. Notably, Tyr369 has been confirmed as a potential radical site in bovine liver catalase.

This study identifies carbon crystal structures as 4-degree quotient graphs and proposes a novel approach for generating 3D 4-coordinate networks using 2D (2+1)-regular bipartite-like graphs. Through a random group and graph theory (RG2) method, we discover 509 new structures, including two low-energy phases (Pbam48 and Pbam40) that exhibit exceptional stability and potential applications as superhard carbon and quasi-direct band gap silicon materials in mechanical processing and solar photovoltaic technologies.

Quasicrystals are long-range-ordered materials with rotational symmetry incompatible with periodicity. Takakura et al. [(2025). IUCrJ 12, 435–443] present a study of a single grain of icosahedrite, the first natural icosahedral quasicrystal, which was found in a meteorite in 2009. Through detailed analysis of the diffraction peaks, they conclude that natural AlCuFe is an icosahedral quasicrystal superimposed by a phasonic modulation along the fivefold directions, which is similar to that observed in the synthetic quasicrystal. Based on knowledge of the synthesis and phase stability of icosahedral AlCuFe, they discuss the formation of icosahedrite in the meteorite.

This work demonstrates that high-quality ultra-fast total scattering data and pair distribution function data can be obtained from a single ∼30 fs pulse at the European XFEL, achieving a record Q range of up to 16.6 Å−1. These results establish XFELs as powerful tools for probing atomic scale structures on ultra-fast timescales, opening new opportunities for studying dynamic processes in disordered and complex materials.

Engineered in crystallo photosensitivity in a DNA-repair enzyme is carefully assessed for its suitability as a target for time-resolved crystallographic studies.

Crystallization is a fundamental non-equilibrium process in materials science, yet its early transient states remain difficult to probe experimentally. Möller et al. [(2025). IUCrJ 12, 462–471] use femtosecond X-ray scattering and X-ray cross-correlation analysis to reveal the structural evolution of defect-containing crystals forming in a supercooled noble-gas liquid.

Vitreous sectioning (CEMOVIS) is an alternative to FIB milling for generating thin samples suitable for cryo-EM imaging. We show that CEMOVIS samples preserve the high-resolution structural details of macromolecular complexes such as the 60S ribosome, despite the visible macroscopic damage visible in the samples.

A set of crystallographic structures has been obtained for the small antiviral protein LCB2 using molecular replacement models from six different structure-prediction programs. This set of structures can be interpreted as a multiconformer ensemble, improving quality metrics and offering an interesting insight into side-chain dynamics.

Single-crystal X-ray structures measured at around 20 K to high resolution were refined with structure-specific restraints from quantum chemical molecule-in-cluster and full-periodic computations, which permits benchmarking levels of theory of varying sophistication. Restraints can then `augment' low-quality crystal structures, with other possible applications.

This review commemorates the centenary of the Debye–Waller factor, highlighting its significance in quantifying the impact of thermal vibrations on scattering intensities as well as on crystal properties in small-molecule crystallography. It provides an introduction to thermal motion and displacement parameters, offering insights for chemists and crystallographers.

Combining improved diffraction methods, modeling approaches and advanced computations allows for a detailed understanding of atomic thermal motions in crystals. Thus, the Topical Review by Hoser & Madsen covers the Debye–Waller factor, the importance of anisotropic displacement parameters, and the interplay of experiment and theory to accurately capture collective atomic vibrations in molecular crystals.

We demonstrate an advanced scattering method for accessing the 3D reciprocal space of crystalline structures forming in a rapidly supercooled noble-gas liquid using a combination of femtosecond X-ray diffraction and X-ray cross-correlation analysis.

The refinement flexibility of the Hansen–Coppens multipole model is tested on DFT calculated structure factors for the tetra­kis­(μ-acetato)di­aquadicopper model system. The Cu scattering factor performs the best of all the options tried for most of the monitored parameters despite the Cu2+ nature of the complex studied. The Hansen–Coppens model performs similarly well when comparing deviations among computational chemistry methods.

A single grain of the icosahedral AlCuFe quasicrystal extracted from the Khatyrka meteorite has been studied by means of high-resolution synchrotron X-ray diffraction at the ESRF. We found that the mineral is a phason-wave modulated icosahedral quasicrystal, a feature already observed for synthetic quasicrystals. This result might be used as a tracer to shed light on the thermal history of the meteorite.

This study reveals how additives and microwave radiation influence the crystallization of new tyramine polymorphs and their cocrystallization with barbital. The findings provide insights into polymorph stability and offer potential applications in molecular encapsulation and optical materials.

Microcrystals are transforming structural biology by enabling high-resolution structures and time-resolved insights from samples once deemed too small. This commentary highlights recent advances in microfocus X-ray and MicroED methods, emphasizing their growing role as powerful and complementary tools in modern macromolecular crystallography.