Bis(benzyl­ammonium) di­hydrogen diphosphate

The asymmetric unit of the title salt, 2C₆H₅CH₂NH₃⁺·H₂P₂O₇²⁻, contains two independent benzyl­ammonium cations and a di­hydrogen diphosphate dianion. In the crystal, O—H...O and N—H...O hydrogen bonds link the cations and anions, forming a two-dimensional network parallel to (010). Within this network, weak C—H...O hydrogen bonds are observed.

Bis[tris­(phenanthroline-κ²N,N′)cobalt(II)] undeca­tungsto(VI)vanado(V)phosphate dihydrate

In the title hydrated salt, [Co(C₁₂H₈N₂)₃]₂[PVW₁₁O₄₀]·2H₂O, the complete Kegggin ion is generated by crystallographic inversion symmetry, which imposes statistical disorder on the O atoms of its central PO₄ group. The V atom is statistically disordered over all the metal sites of the anion. In the cation, the Co²⁺ ion is coordinated by three bidentate 1,10-phenanthroline (phen) ligands, generating a distorted CoN₆ octa­hedron. Possible very weak intra­molecular C—H...π inter­actions occur in the cation. In the crystal, the components are linked by O—H...O and C—H...O inter­actions, building a three-dimensional network featuring one-dimensional voids along the c-axis direction.

Piperazine-1,4-diium bis­(hexa­hydroxido­hepta­oxidohexa­borato-κ³O,O′,O′′)cobaltate(II) hexa­hydrate

In the title hydrate, (C₄H₁₂N₂)[Co{B₆O₇(OH)₆}₂]·6H₂O, both the dication and dianion are generated by crystallographic inversion symmetry. The Co²⁺ ion in the dianion adopts a fairly regular CoO₆ octa­hedral coordination geometry arising from the two O,O′,O′′-tridentate ligands. In the crystal, the dianions and water mol­ecules are linked by O—H...O hydrogen bonds, generating a framework with large [100] channels, which are occupied by the organic dications. N—H...O and C—H...O hydrogen bonds consolidate the structure.