Bisodium-substituted vanadium oxide cluster with encapsulated [VO4]4− core and its electrochemical property

A spherical deca-vanadophosphate covalent assembled all-inorganic open framework

Through covalent connection of phosphate groups, an all-inorganic open framework, [NH₄]₉[P₄V₁₀O₃₄]_1.5·3H₂O (1), has been prepared by a hydrothermal reduction-condensation method. It is built from a vanadophosphate (VPO) unit of [P₄V₁₀O₃₄]^6-, which represents a rare example of a spherical {V₁₀-type} structure among the VPO family. Further studies also demonstrate that compound 1 is an n-type semiconductor.

Supramolecular recognition influences magnetism in [X@HV(IV) 8 V(V) 14 O54 ](6-) self-assemblies with symmetry-breaking guest anions

Mixed-valence polyoxovanadates(IV/V) have emerged as one of the most intricate class of supramolecular all-inorganic host species, able to encapsulate a wide variety of smaller guest templates during their self-assembly formation process. As showcased herein, the incorporation of guests, though governed solely by ultra-weak electrostatic and van der Waals interactions, can cause drastic effects on the electronic and magnetic characteristics of the shell complex of the polyoxovanadate. We address the question of methodology for the magnetochemical analysis of virtually isostructural {V(IV/V) 22 O54 }-type polyoxoanions of D2d symmetry enclosing diamagnetic VO2 F2 (-) (C2v ), SCN(-) (C∞v ), or ClO4 (-) (Td ) template anions. These induce different polarization effects related to differences in their geometric structures, symmetry, ion radii, and valence shells, eventually resulting in a supramolecular modulation of magnetic exchange between the V(3d) electrons that are partly delocalized over the {V22 O54 } shells. We also include the synthesis and characterization of the novel [V(V) O2 F2 @HV(IV) 8 V(V) 14 O54 ](6-) system that comprises the rarely encountered discrete difluorovanadate anion as a quasi-isolated guest species.

Bis[tris(2,2′-bipyridyl-κ2N,N′)cobalt(II)]cyclo-tetravanadate undecahydrate

The title compound, [Co(C10H8N2)3]2[V4O12]·11H2O, is composed of two symmetry-related cations containing octahedrally coordinated CoIIions, a centrosymmetric [V4O12]4−anion with an eight-membered ring structure made up of four VO4tetrahedra, and 11 solvent water molecules. The CoIIcations and vanadate anions are isolated and build cation and anion layers, respectively. In addition, the title compound exhibits a three-dimensional network through intra- and intermolecular hydrogen-bond interactions between water molecules and O atoms of the anions, and the crystal structure is stabilized mainly by hydrogen bonds.

Water-capsule strategy in crystal engineering for water-solubility conversion from insoluble to soluble

(H(2)O)(32)-shell structure constructed by two unique water molecules in high symmetry crystal leads to good water-solubility of the obtained compound 1.