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cif-access (organic compounds)
In the title compound, C2H10N22+.2C4H3O4-, ethylene diammonium cations are centred on inversion centres and the monhydrogenmaleate anions are in general positions. The components are assembled into double layers by hydrogen bonding. The unique NH3+ group connects the planar rings of the intramolecularly hydrogen-bonded anions into chains and cross-links the chains into centrosymmetric 18-membered rings, with intramolecular OO 2.452 (2) Å and ON in the range 2.816 (2)-2.852 (2) Å.