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(2,6-di­methyl­anilinium) di­aqua­bis­(di­hydrogen diphosphato-κ²O,O′)cobaltate(II)

In the title compound, (C₈H₁₂N)₂[Co(H₂P₂O₇)₂(H₂O)₂], the Co²⁺ ion lies on a crystallographic inversion centre and adopts a slightly distorted octa­hedral CoO₆ coordination geometry arising from two chelating diphosphate [H₂P₂O₇]²⁻ ligands and two trans water mol­ecules. In the crystal, the components are linked by O—H...O, N—H...O and C—H...O hydrogen bonds and weak aromatic π–π stacking [shortest centroid–centroid separation = 3.778 (2) Å] inter­actions. (001) layers of alternating organic cations and complex inorganic anions are apparent.