The asymmetric unit of the title salt, 2C
6
H
5
CH
2
NH
3
+
·H
2
P
2
O
7
2−
, 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.
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.
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