title: 1,4-Diazo-niacyclo-hexane bis-(3-carb-oxy-pyrazine-2-carboxyl-ate) dihydrate.
abstract: In the title compound, C(4)H(12)N(2) (2+)·2C(6)H(3)N(2)O(4) (-)·2H(2)O or (1,4-dacH(2))(pyzdcH)(2)·2H(2)O, the complete dication is generated by crystallographic inversion symmetry. An intra-molecular O-H⋯O hydrogen bond occurs in the anion. In the crystal, O-H⋯O, O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds result in the formation of a three-dimensional network. Additionally, π-π stacking inter-actions between the pyrazine rings with centroid-centroid distances of 3.7065 (2) Å are observed.
authors: Hossein
authors: H
authors: Eshtiagh-Hosseini
authors: Nafiseh
authors: N
authors: Alfi
authors: Masoud
authors: M
authors: Mirzaei
authors: Marek
authors: M
authors: Necas
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