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Solid state annular tautomerism in a molecule containing two imidazole moieties

机译:包含两个咪唑部分的分子中的固态环状互变异构

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The X-ray crystal structure of the 1:2 condensate (1) of hydrazine hydrate and 4-methyl-imidazole-5-carboxaldehyde has been determined. The molecule is centrosymmetric crystallising in the space group Fddd with cell dimensions: a = 10.557(14), b = 17.062(22), c = 24.759(27) angstrom. Fourier map shows that the NH hydrogen atom of each imidazole moiety has equal possibility of occupying any of its two ring N atoms. This poses the possibility of finding three tautomers in 1 in the solid state. Consideration of the H-bonding pattern observed in 1 and related B3LYP/6-311+G(2d, p) calculations show that only two tautomers are present in the solid state. The situation is compared with that in the structure of 4(5)-nitro-5(4)-methoxy-imidazole reported previously by Kubicki.
机译:已经确定了水合肼与4-甲基咪唑-5-甲醛的1:2缩合物(1)的X射线晶体结构。分子在空间群Fddd中呈中心对称结晶,其细胞尺寸为:a = 10.557(14),b = 17.062(22),c = 24.759(27)埃。傅立叶图表明,每个咪唑部分的NH氢原子具有相等的可能性占据其两个环N原子中的任何一个。这带来了以固态形式发现三个互变异构体的可能性为1。考虑到1和相关的B3LYP / 6-311 + G(2d,p)计算中观察到的H键模式,表明只有两个互变异构体以固态存在。将这种情况与Kubicki先前报道的4(5)-硝基-5(4)-甲氧基-咪唑的结构进行了比较。

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