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-meth­oxy­benzyl­ammonium) di­aqua­bis­(di­hydrogen diphosphato-κ²O,O′)cobaltate(II) dihydrate

The title compound, (C₈H₁₂NO)₂[Co(H₂P₂O₇)₂(H₂O)₂]·2H₂O, crystallizes isotypically with its Mn^II analogue. It consists of alternating layers of organic cations and inorganic complex anions, extending parallel to (100). The complex cobaltate(II) anion exhibits -1 symmetry. Its Co²⁺ atom has an octa­hedral coordination sphere, defined by two water mol­ecules in apical positions and two H₂P₂O₇²⁻ ligands in equatorial positions. The cohesion between inorganic and organic layers is accomplished by a set of O—H...O and N—H...O hydrogen bonds involving the organic cation, the inorganic anion and the remaining lattice water mol­ecules.