forthcoming articles

The following articles are a selection of those recently accepted for publication in IUCr journals.

Journal logoActa Crystallographica Section A
Acta Crystallographica
Section A
FOUNDATIONS AND ADVANCES
Accepted 25 March 2025

Uncertainties of recalculated bond lengths, angles and polyhedral volumes as implemented in the Crystal Palace program for parametric crystal structure analysis

Crystal Palace is a new Windows program for parametric analysis of least-squares and atomic coordination with estimated standard uncertainties. It allows the easy analysis of how crystal structures change with temperature, pressure or composition.

Accepted 15 March 2025

Topological coordination numbers and coordination reciprocity from electron-density distributions

An approach is presented to calculate topological coordination numbers (tCNs) obeying the principle of coordination reciprocity from solid angles subtended by the interatomic surfaces of electron density (QTAIM) atomic domains. The tCN approach characterizes a compound's coordination situation as a set of sub-coordination scenarios with associated weights, which is considered a suitable input for future AI applications on structure–property relationships.

Accepted 12 March 2025

A new order parameter model for the structural phase transitions in VO2-based solid solutions


Accepted 28 January 2025

Refuting `a new theory for X-ray diffraction' – a reciprocal-space approach

Journal logoActa Crystallographica Section B
Acta Crystallographica
Section B
STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

Accepted 15 April 2025

Multipolar model and Hirshfeld atom refinement of tetra­aqua­bis­(hydrogenmaleato)iron(II)

Multipolar model and Hirshfeld atom refinement are conducted on tetra­aqua­bis(hydrogenmaleato)iron(II) based on a high-resolution X-ray diffraction experiment. Topological analysis is performed on both models. The study evaluates these models by comparing their effectiveness in determining bond lengths, anisotropic displacement parameters, electron densities, and atomic charges.

Accepted 27 March 2025

Shifting and tilting towards enhanced piezoelectricity in high-temperature ceramics: an average structure study of (1 − x)BiFe2/8Ti3/8Mg3/8O3xTiO3 through X-ray and neutron diffraction

The crystallographic structure of a novel high-TC piezoelectric solid solution is revealed. Detailed structural analysis through X-ray and neutron diffraction provides structural meaning to this material's complex behaviour.
Journal logoActa Crystallographica Section C
Acta Crystallographica
Section C
STRUCTURAL CHEMISTRY

Accepted 21 April 2025

Synthesis and crystal structures of a family of bimetallic com­plexes with phenyl-substituted bridging tetra­oxo­lene ligands

The rich redox chemistry of tetra­oxo­lene ligands is harnessed to synthesize a family of bimetallic com­plexes with phenyl-substituted bridging tetra­oxo­lene and terminal tris­[(pyridin-2-yl)meth­yl]amine ligands.

Accepted 19 April 2025

Synthesis, crystal structure, Hirshfeld surface analysis, experimental and theoretical study of new azo com­pound methyl 2-{2-[(E)-2-oxo-1,2-di­hydro­naphthalen-1-yl­idene]hydrazin-1-yl}benzoate

The crystal structure of the new azo com­pound methyl 2-{2-[(E)-2-oxo-1,2-di­hydro­naphthalen-1-yl­idene]hydrazin-1-yl}benzoate was determined by X-ray diffraction at 173 K. The asymmetric unit is repre­sent­ed in its hydrazoic form. The mol­ecule consists of a benzene ring and a β-naphthol ring which are linked to the hydrazo group and adopts an E conformation with respect to the –N=N– bridge, each mol­ecule has an intra­molecular N—H⋯O hy­dro­gen bond in the crystal.
Journal logoActa Crystallographica Section D
Acta Crystallographica
Section D
STRUCTURAL BIOLOGY

Accepted 23 April 2025

Mechanistic insight into O=O bond formation upon model-independent visualization of coordination geometry and ligand composition of Mn4Ca cofactor in dark-adapted photosystem II structures

Model-independent visualization of OEC-omit electron-density maps of dark-adapted photosystem II reveals inner working of this four-step/four-chamber combustion engine running in a reverse direction.

Accepted 28 March 2025

Robust error calibration for serial crystallography

We present a new error-calibration algorithm for reflection intensities in serial crystallography. We reformulate the mathematical basis of the problem and apply different levels of uncertainty to each observed lattice corresponding to its measurement accuracy. These uncertainties are more consistent with theoretical expectations than the Ev11 error-calibration algorithm previously implemented in cctbx.xfel.merge.
Journal logoActa Crystallographica Section E
Acta Crystallographica
Section E
CRYSTALLOGRAPHIC COMMUNICATIONS

Accepted 23 April 2025

Structure of (E)-4-amino-5-{[(1,5-di­methyl-3-oxo-2-phenyl-2,3-di­hydro-1H-pyrazol-4-yl)imino]­meth­yl}-1-methyl-2-phenyl-2,3-di­hydro-1H-pyrazol-3-one: aerial oxidation of 4-amino­anti­pyrine in di­methyl­formamide

The formation of the title compound is best explained by the aerial oxidation of the 5-methyl group of 4-amino­anti­pyrine to an aldehyde group, and subsequent inter­molecular Schiff base formation with a second mol­ecule of 4-amino­anti­pyrine. The reaction only takes place in the presence of di­methyl­formamide.

Accepted 18 April 2025

Ortho­rhom­bic cerium(III) carbonate hydroxide studied by synchrotron powder X-ray diffraction

A synchrotron powder X-ray diffraction study of commercially obtained ‘cerium(III) carbonate hydrate' indicates that multiple Ce-containing phases coexist, none of which are Ce2(CO3)3. The majority phase is an ortho­rhom­bic phase of composition CeCO3OH.

Accepted 12 April 2025

Crystal structure, Hirshfeld surface, DFT and mol­ecular docking studies of 4-bromo-2-chlorophenyl (2E)-3-[4-(pent­yloxy)phen­yl]prop-2-enoate

In the title compound, the aromatic rings are oriented at a dihedral angle of 83.30 (8)°. An intra­molecular C—H⋯O contact generates a five-membered S(5) ring motif. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules through R12(6), R22(10), R22(14) hydrogen-bond motifs.

Accepted 3 April 2025

Rapid and facile one-step microwave synthesis of macrobicyclic cryptands

Liquid-assisted grinding (LAG) and microwave synthesis are proposed as alternative routes for the synthesis of cryptands, with reaction times of up to 16 times faster than traditional methods.

Accepted 6 March 2025

Synthesis, crystal structure and Hirshfeld surface analysis of 2,2-di­chloro-3,3-dieth­oxy-1-(4-fluoro­phen­yl)propan-1-ol

We have isolated and structurally chracterized 2,2-di­chloro-3,3-dieth­oxy-1-(4-fluoro­phen­yl)propan-1-ol by simple hy­dro­genation of 2,2-di­chloro-3,3-dieth­oxy-1-(4-fluoro­phen­yl)propan-1-one. Hirshfeld surface analysis was performed.
Journal logoActa Crystallographica Section F
Acta Crystallographica
Section F
STRUCTURAL BIOLOGY COMMUNICATIONS

Accepted 23 April 2025

Structure of an Fe2+-binding-deficient mimiviral collagen lysyl hydroxylase

Fe2+ binding stabilizes collagen lysyl hydroxylase dimers, although the underlying mechanism remains unclear. Here, we show the crystal structure of Fe2+-binding-deficient mimiviral collagen lysyl hydroxylase, highlighting the conformational changes upon loss of Fe2+ binding.
Journal logoJournal of Applied Crystallography Journal of Applied
Crystallography

Accepted 11 April 2025

Machine Learning-Informed Scattering Correlation Analysis of Sheared Colloids

Machine learning-informed scattering correlation analysis extracts polydispersity and microscopic rearrangements from scattering data, enabling precise insights into dynamic processes in colloidal dispersions

Accepted 9 April 2025

Phase behavior of Silica-PNIPAm nanogels under high hydrostatic pressure

The role of hydrostatic pressure on the structure and dynamics of concentrated silica-PNIPAm nanogels reveals similar characteristics found in temperature-induced phase transitions. In contrast it is characterized by significant aging in glass and gel samples which is absent in the liquid state.

Accepted 30 March 2025

Elongated particles in flow: commentary on small-angle scattering investigations

We critically examine mathematical tools to invert the orientation distribution of flowing elongated objects from anisotropic small angle scattering data. This evaluation aims to advance understanding of the interplay between flow dynamics and object orientation, benefiting fluid dynamics and materials science.

Accepted 25 March 2025

Effect of gap design of a double-layer heater on melt flow behavior in a single-crystal furnace

The split-type structure of double-layer heaters can significantly reduce production costs and mitigate dependence on imports, garnering widespread attention in the crystal production industry. This article explores the relationship between gap design and melt flow, in order to provide the currently lacking theoretical basis for the design of double-layer heaters

Accepted 22 March 2025

Interface densification in a microphase-separated diblock copolymer resolved by small-angle X-ray scattering

The electron density distribution along the lamellar normal in a block copolymer, as determined by SAXS, reveals segmental densification at the domain interface. This interfacial densification is attributed to the negative mixing volume in the segmental mixture of the constituent blocks, a distinct characteristic of block copolymers exhibiting lower critical ordering transition or hourglass phase behavior.

Accepted 21 March 2025

Individual dislocation identification in dark-field X-ray microscopy

Experimental and simulated dark-field X-ray microscopy (DFXM) images of isolated dislocations in bulk single-crystal aluminium were combined to identify the Burgers vector, slip plane and line direction of the dislocations. Burgers vector identification missed only the sign, and line direction was determined with an error of less than 10°, sufficient for most applications.

Accepted 20 March 2025

Thermal behavior of römerite over a Mars surface relevant temperature range: single-crystal X-ray and powder X-ray crystallography and magnetic properties

The behavior of römerite, Fe2+Fe3+2(SO4)4(H2O)14, was examined by utilizing in situ single-crystal and powder X-ray diffraction while simultaneously acquiring data upon heating. Römerite is stable under low-vacuum conditions and exhibits a significant negative thermal expansion in the α33 direction throughout the entire temperature range from −173°C to 77°C and on up to decomposition.

Accepted 18 March 2025

Forward-model-based grain reconstruction to improve the tolerance of diffraction contrast tomography for increased sample deformation

A novel forward-model-based reconstruction method has been developed for diffraction contrast tomography and has shown great promise in increasing the tolerance of this technique for increased sample deformation. This method is suitable for multi-phase reconstruction under both box-beam and line-beam acquisition geometries and can reconstruct intragranular misorientations well.

Accepted 17 March 2025

A simple cryotransfer method for 3D electron diffraction measurements of highly sensitive samples

A simple protocol for transferring highly moisture-sensitive compounds into a transmission electron microscope for 3D electron diffraction measurements is described, with xenon fluorides as a test case. By maintaining an inert moisture-free environment throughout the transfer step, the integrity of the samples is preserved, thereby rendering the technique applicable to the study of other reactive or strongly oxidizing compounds.

Accepted 16 March 2025

Optimal weights and priors in simultaneous fitting of multiple small-angle scattering datasets

Here, we determine optimal weights and priors when simultaneously fitting small-angle X-ray and neutron scattering data.

more ...
Journal logoJournal of Synchrotron Radiation Journal of
Synchrotron Radiation

Accepted 3 April 2025

Optimizing a photon absorber using conformal cooling channels and additive manufacturing in copper

This study optimizes a Diamond Light Source photon absorber using additive manufactured (AM; 3D printing) conformal cooling channels in copper, achieving a maximum temperature drop of 11%, pressure drop reduction of 82% and examination of the AM print quality and its compliance with synchrotron and particle accelerator hardware applications using custom benchmark artefacts. These improvements can reduce thermal fatigue failure, component size, vibrations and energy consumption of absorbers, boosting overall facility efficiency, reliability and beam stability.

Accepted 31 March 2025

50th Anniversary of the Stanford SSRLSynchrotron Radiation and protein crystallography initiative

We provide a historical introduction, our thoughts on the current trends including based on papers in this special issue of the Journal of Synchrotron Radiation celebrating the 50th Anniversary of the Stanford SSRL synchrotron radiation and protein crystallography initiative led by Keith Hodgson.
IUCrJ
Accepted 11 March 2025

Additive-driven microwave crystallization of tyramine polymorphs and salts: a quantum crystallography perspective

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.
Journal logoIUCrData
IUCrData

Accepted 24 April 2025

2′-Amino-5′-benzoyl-5-bromo-6′-methyl-2-oxo­spiro­[indoline-3,4′-pyran]-3′-carbo­nitrile

In the title compound, the indoline ring system is almost planar, while the pyran ring is in flattened-boat conformation. In the crystal, N—H⋯O and N—H⋯N hydrogen bonds link the mol­ecules, enclosing R22(8) and R22(12) ring motifs, into (001) sheets.

Accepted 20 April 2025

Bis[5-(anthracen-9-ylmeth­yl)-1,5,9-tri­aza­cyclododecan-1-ium] tetra­chlorido­zincate

The structure of the title salt comprising two monoprotonated polyamine ligands and one tetra­chloro­zincate(II) anion was analyzed and compared with those of structurally related compounds bearing different macrocyclic frameworks and pendant arms. The protonated nitro­gen atoms engaged in intra­molecular hydrogen bonding with other nitro­gen atoms within the macrocyclic ring.

Accepted 17 April 2025

3-Chloro­propio­phenone

The title compound, 3-chloro­propio­phenone C9H9ClO, consists of an almost planar mol­ecule that is charaterized by very small torsion angles within the alkyl side chain (torsion angles < 6.3°).

Accepted 10 April 2025

4,12-Diselena-5,6,13,14-tetra­aza­tri­cyclo­[9.3.0.03,7]tetra­deca-1(11),3(7),5,13-tetra­ene

Two almost planar 1,2,3-selena­diazo­les are annulated to a cyclo­octa-1,4-diene with a boat–chair conformation, giving the mol­ecule a butterfly shape.


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