forthcoming articles

The following articles are a selection of those recently accepted for publication in Acta Crystallographica Section C: Structural Chemistry.

See also Forthcoming articles in all IUCr journals.

Accepted 10 September 2018

Syntheses, crystal structures and optical properties of two one-dimensional germanophosphates: HRb3Ge2(HPO4)5 and CsGe(HPO4)2(OH)

Two one-dimensional alkali-metal germanophosphates (GePOs), namely, HRb3Ge2(HPO4)6 and CsGe(HPO4)2(OH), have been prepared by the solvothermal method. The former shows one-dimensional (1D) [Ge(HPO4)6] chains along the c axis and the latter shows 1D [Ge(HPO4)4(OH)2] chains.

Accepted 7 September 2018

Synthesis, crystal structure and cytotoxic activity of novel 5-methyl-4-thio­pyrimidine derivatives

The cytotoxicities of 4-thio­pyrimidine derivatives obtained from ethyl 4-methyl-2-phenyl-6-sulfanyl­pyrimidine-5-carboxyl­ate were examined against Human umbilical vein endothelial cells (HUVEC) and HeLa, K562 and CFPAC cancer cell lines. The presence of hy­droxy­methyl and methyl groups offers an inter­esting new insight into the structures and behaviour of these derivatives.

Accepted 6 September 2018

Crystal structure and sequential dehydration transitions of disodium guanosine 5′-monophos­phate tetra­hydrate

It was found that the structure of disodium guanosine 5′-monophosphate tetra­hydrate differs markedly from that of the hepta­hydrate, but greatly resembles that of disodium de­oxy­guanosine 5′-monophosphate tetra­hydrate.

Accepted 5 September 2018

Dilithium (citrate) crystals and their relatives

The crystal structures of four isostructural citrate salts, LiMHC6H5O7 (M = Li, Na, K and Rb), have been solved and refined using laboratory powder X-ray diffraction data and optimized using density functional techniques.

Accepted 4 September 2018

A novel dicobalt-substituted tungsto­anti­monate: synthesis, spectroscopic characterization and catalysis for photoinduced water oxidation

A dicobalt-substituted tungsto­anti­monate was synthesized and reported as a stable catalyst in the visible-light-driven catalytic oxidation of water for the first time.

Accepted 21 August 2018

Two new POM-based compounds modified by lanthanide–Schiff base complexes with inter­esting NLO properties

Two POM-based lanthanide–Schiff base complexes have been successfully isolated under hydro­thermal conditions. Inter­estingly, they show excellent two-photon responses, suggesting that they have potential applications in the NLO field.

Accepted 7 August 2018

Single-crystal-to-single-crystal transformations triggered by dehydration in polyoxometalate-based compounds

The examples of single-crystal-to-single-crystal transformations triggered by dehydration that have been reported to date for polyoxometalate-based compounds are compiled and discussed in this feature article.

Accepted 30 July 2018

Recent advances of polyoxometalate-catalyzed selective oxidation based on structural classification

Recent advances regarding POM-catalyzed selective oxidation and work which contributes to elucidating the origin/distinction of catalytic activity, as well as reasonable mechanisms, are summarized.

Accepted 24 July 2018

A polyoxometalate-based metal–organic poly­hedron constructed from a {V5O9Cl} building unit with rhombicubocta­hedral geometry

A new polyoxovanadate-based metal–organic polyhedron with an rdo topology was constructed from a {V5O9Cl} building unit and benzene-1,3,5-tri­carb­oxy­lic acid under solvothermal conditions. The title compound displays rhombicubocta­hedral geometry when the polyoxovanadate building units and organic ligands were considered as the quadrangular and triangular faces of a polyhedron.

Accepted 11 July 2018

Iron(II) and copper(II) paratungstates B: a single-crystal X-ray diffraction study

Two new isopolytungstates, Na5Fe2.5[W12O40(OH)2]·36H2O and Na4Cu3[W12O40(OH)2]·28H2O, have been prepared and structurally characterized. The compounds exhibit a three-dimensional structure, in which the paratungstate anions coordinate to FeII or CuII ions in a polydentate mode.

Accepted 4 July 2018

Surface-grafted lanthanoid complexes of the tungstosilicate polyanion [SiW12O40]4−: a synthetic, structural and computational investigation

The hydro­thermal synthesis of two inorganic–organic hybrid assemblies and their structural characterization using single-crystal X-ray diffraction reveals that they consist of [SiW12O40]4− Keggin-type polyoxometalates decorated with trimeric lanthanoid complexes and templated by a single Na+ cation. Density functional theory (DFT) calculations on both compounds were performed to analyze the polyanion–π inter­actions in the solid-state structures.

Accepted 28 June 2018

Synthesis, structural characterization and fluorescence enhancement of chromophore-modified polyoxometalates

Three new chromophore-modified polyoxometalates have been synthesized and characterized by single-crystal X-ray diffraction. The fluorescence properties of the resulting polyoxometalate hybrids can be boosted by tuning the solvents. We demonstrate an easy and feasible method for solving the fluorescence quenching problem of POM–chromophore dyads. Our work may open up a new pathway for the development of POM-based fluorescent sensors or switches.

Accepted 18 June 2018

Synthesis and structural characterization of tube-type tetra­deca­vanadates

By controlling the hydrogen-bonding inter­actions between ammonium cations and polyoxometalates, structure conversion from anion-incorporated bowl-type dodeca­vanadates to tube-type structures was achieved.

Accepted 4 June 2018

Effect of the ammonium ion on proton conduction in porous ionic crystals based on Keggin-type silicododeca­tungstate

A porous ionic crystal based on Keggin-type silicododeca­tungstate with ammonium ions shows high proton conductivity and low activation energy under high relative humidity, showing that protons migrate efficiently via rearrangement of the hydrogen-bonding network formed by the NH4+ cations and the waters of crystallization.

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