Acta Cryst. (2013). C69, 761-764 [ doi:10.1107/S0108270113013929 ]
Abstract: The title compound, C9H13N4O3+·NO3-, is the first structurally characterized Schiff base derived from semicarbazide and pyridoxal. Unusually for an unsubstituted semicarbazone, the compound adopts a syn conformation, in which the carbonyl O atom is in a cis disposition relative to the azomethine N atom. This arrangement is supported by a pair of hydrogen bonds between the organic cation and the nitrate anion. The cation is essentially planar, with only a hydroxymethyl O atom deviating significantly from the mean plane of the remaining atoms (r.m.s. deviation of the remaining non-H atoms = 0.01 Å). The molecules are linked into flat layers by N-HO and C-HO hydrogen bonds. O-HO hydrogen bonds involving the hydroxymethyl group as a donor interconnect the layers into a three-dimensional structure.
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