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The supramolecular architecture in 4, 4'-bipyridinium bis(hydrogen oxalate)

The asymmetric unit of the title compound, C10H10N22+•2C2HO4–, consists of one half of a 4, 4'-bipyridinium cation, which has the inversion symmetry, and a hydrogen oxalate anion. Cations and anions are connected together by the hydrogen N–H•••O and C–H•••O bonds forming a two-dimensional pattern, whereas the π•••π stacking interactions between the 4, 4'-bipyridinium cations lead to an overall three-dimensional supramolecular structure. An unusual decaatomic ring is formed between two hydrogen oxalate anions, which are linked side-to-side via the (–)O–H•••O(–) hydrogen bonding interactions. An intramolecular hydrogen bond exists in the hydrogen oxalate anion.

4; 4'-bipyridinium cation; hydrogen oxalate anion; crystal structure

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