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 asynconformation, in which the carbonyl O atom is in acisdisposition 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—H...O and C—H...O hydrogen bonds. O—H...O hydrogen bonds involving the hydroxymethyl group as a donor interconnect the layers into a three-dimensional structure.
标题化合物 C9H13N4O3+-NO3- 是第一个从半咔嗪和吡哆醛衍生出的具有结构特征的希夫碱。与未取代的缩氨基脲不同的是,该化合物采用了异构型,其中羰基 O 原子相对于偶氮甲基 N 原子呈顺式排列。这种排列由有机阳离子和硝酸根阴离子之间的一对氢键支持。阳离子基本上是平面的,只有一个羟甲基 O 原子明显偏离其余原子的平均平面(其余非 H 原子的 r.m.s. 偏差 = 0.01 Å)。分子通过 N-H...O 和 C-H...O 氢键连接成平面层。羟甲基作为供体参与的 O-H...O 氢键将各层连接成三维结构。