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The structure of the title compound, 2N 2 H 5 + .C 10 H 4 -N 2 O 6 2- , consists of alternate layers of phthalazine dianions and hydrazinium cations linked by an extensive network of hydrogen bonds. One of the independent cations also forms a close ion pair with a carboxylate group of the anion without a hydrogen bond.
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Benniston et al. (1999) studied this question.
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