A novel crystal polymorph of volborthite, Cu₃V₂O₇(OH)₂·2H₂O

X-ray diffraction reveals a new polymorph of volborthite in a single crystal prepared by hydro­thermal means. The structure is monoclinic (space group C2/c) at room temperature, with the unit cell doubled with respect to the previously reported C2/m structure.

Pb₅In₃Bi₅S₁₇ [Pb_4.94(3)In_3.05(3)Bi_4.99(3)S₁₇] and its structural relationship with Pb₄In₃Bi₇S₁₈

The structure of the compound Pb_4.94(3)In_3.05(3)Bi_4.99(3)S₁₇, a compositional variant of a new quaternary sulfide phase, is closely related to that of Pb₄In₃Bi₇S₁₈.

Penta­guanidinium mono­hydrogen­diphospho­penta­molybdate(VI) 2.5-hydrate, (CH₆N₃)₅[HP₂Mo₅O₂₃]·2.5H₂O: hydrogen bonding and π-stacking in guanidinium cations

In the title compound, each singly protonated diphospho­penta­molyb­date(VI) anion retains the typical geometry of a ring of five edge-sharing MoO₆ octa­hedra, except for one corner-sharing link. Two capping PO₄ tetra­hedra share corners with the five octa­hedra. Despite being surrounded by an extensive network of hydrogen bonds, predominantly from the guanidinium cations, short P—O—H⋯O=P contacts associate the anions into infinite columns generated by the c-glide.

Li_0.97Fe^II_0.79Fe^III_0.15(PO₄), a new oxidized triphylite-type phosphate

The title compound, Li_0.97Fe^II_0.79Fe^III_0.15(PO₄), has been synthesized hydro­thermally at 973 K and 0.1 GPa. Its crystal structure is similar to that of natural triphylite and is characterized by two chains of edge-sharing octa­hedra parallel to the b axis. The M1 octa­hedra contain Li and vacancies, and the M2 octa­hedra contain Fe^II, Fe^III and vacancies.

4,4′-Bi(1H-pyrazol-2-ium) tetra­chlorido­aurate(III) chloride: a three-dimensional cationic cooperite-like framework with multiple pyrazolium–chloride hydrogen-bonding inter­actions

Self-assembly of long-chain quaternary ammonium cations in a hybrid inorganic–organic material with one-dimensional polymeric tri­bromido­plumbate(II)

A new two-dimensional cadmium coordination polymer with 1H-imidazole-4-carboxyl­ate and oxalate

Two [Cu₂I₂]-based coordination polymers of 1,3-bis­(pyridin-4-yl)propane

Bis(2-amino-1H-benzimidazol-3-ium) tetra­kis­(μ-but-2-en­oato)-κ⁴O:O′;κ³O,O′:O;κ³O:O,O′-bis­[bis­(but-2-en­oato-κ²O,O′)holmium(III)]

π–π Dimerization of a mono(pyrid­yl–imine) platinum(II) chelate

The three-dimensional coordination network in poly[di-μ₃-cyanido-μ₅-[5-(pyridin-4-yl)tetra­zol­ato]-tricopper(I)]

An example of the refinement of positional disorder modeled as compositional disorder in [5-(2-formyl­phen­yl)-10,15,20-tri­phenyl­porphyrinato]nickel(II)

A new hybrid organic–inorganic chain: [(phen)Cu–μ-(κ²O:O′-VP₂O₁₀H₃)₂–Cu(phen)]_n

XRD and VCD: a marriage of love or convenience? Honeymoon around a cyclic urea derivative

Cyclic imides and an open-chain amide carb­oxy­lic acid from the facile reaction of cis-cyclo­hexane-1,2-car­boxy­lic anhydride with the isomeric mono­fluoro­anilines

Inter­molecular C—H⋯O and C—H⋯X inter­actions in substituted spiro­ace­naphthylene structures

A 1:1 cocrystal of baicalein with nicotinamide

4-Carb­oxy­pyridinium perchlorate 18-crown-6 dihydrate clathrate and 4-carb­oxy­pyridinium tetra­fluoro­borate 18-crown-6 dihydrate clathrate

Competing inter­molecular inter­actions in some `bridge-flipped' isomeric phenyl­hydrazones