In the title compound, 2C8H12N+·H2P2O7
2−, the complete dihydrogendiphosphate anion is generated by crystallographic twofold symmetry, with the bridging O atom lying on the rotation axis [P—O—P = 135.50 (9)°]. In the crystal, the 2,3-xylidinium cations are anchored between ribbons formed by the H2P2O7 entities. Crystal cohesion and stability are supported by electrostatic interactions which, together with N—H⋯O and O—H⋯O hydrogen bonds, build up a three-dimensional network.
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