Abstract
The asymmetric unit of the title compound, C(10)H(10)N(2)(2+)·2C(2)HO(4)(-), consists of one half of a 4,4'-bipyridinium cation, which has inversion symmetry, and a hydrogen oxalate anion, in which an intramolecular hydrogen bond exists. The cations and anions are connected by O-H···O, N-H···O and C-H···O hydrogen bonds, forming a two-dimensional network, whereas π-π stacking interactions involving the 4,4'-bipyridinium cations lead to the formation of a three-dimensional supramolecular structure. An unusual deca-atomic ring is formed between two hydrogen oxalate anions, which are linked side-to-side via O-H···O hydrogen-bonding interactions.
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