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(C4H12N2)H2P2O7 is a typical layer organization built by organic and inorganic groups centred by planes parallel to (1 0 0). Unit formula consists of one acidic anion and two half organic cations crystallografically independent. H2P2O7 have no internal symmetry whereas the piperazinium cations are centrosymmetric. Inorganic layers are built by strong hydrogen bonds. The cohesion of the structure results from a network of a weak hydrogen bonds.
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