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Influence of the Structure of Triazole Derivative Molecules on the Efficiency of Formation of Intermolecular H-Bonds

机译:三唑衍生物分子结构对分子间H键形成效率的影响

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It is shown by IR spectroscopy and quantum chemical methods that H-bonds in 1,2,4-triazole, 1,2,4-triazole-thiol-5, and 3-methyl-1,2,4-triazole-thiol-5 molecules in the polycrystalline state are formed mainly by the N(1)-H bond and the N(4) atom of the neighboring molecule. In the 1,2,3-benzotriazole molecule, the H-bond is formed between the N(1)-H bond and the whole electronic pi-system of the neighboring molecule. The formation enthalpies of H-bonds are estimated from the correlation relation between the shift of the N(1)-H stretching vibration in the associated (bonded) state relative to the free (non-bonded) state and the formation enthalpy of the H-bond for the molecules of triazole derivatives. For 1,2,4-triazole, 1,2,4-triazole-thiol-5, 3-methyl-1,2,4-triazole-thiol-5, and 1,2,3-benzotriazole molecules, these enthalpies are -7.67 kcal/mol, -7.42 kcal/mol, -7.1 kcal/mol, and -9.17 kcal/mol, respectively. It is inferred that the data obtained for the correlation between the negative charge on the N(4) atom and the formation enthalpy of the H-bond can be regarded an evidence that Coulomb interaction is the main contribution to the formation of intermolecular H-bonds in triazoles.
机译:它由IR光谱和量子化学方法表示,其中1,2,4-三唑,1,2,4-三唑-5和3-甲基-1,2,4-三唑 - 硫醇 - 多晶态中的5分子主要由N(1)-H键和相邻分子的N(4)原子形成。在1,2,3-苯并三唑分子中,H键形成在N(1)-H键和相邻分子的整个电子PI系统之间形成。 H键的形成焓是从相关(粘合的)状态的N(1)-H伸展振动的偏移与H的自由(非粘结)状态和H的形成焓之间的相关关系估算-bond用于三唑衍生物的分子。对于1,2,4-三唑,1,2,4-三唑-Chiol-5,3-甲基-1,2,4-三唑-5和1,2,3-苯并三唑分子,这些焓是-7.67 kcal / mol,-7.42 kcal / mol,-7.1kcal / mol,和-9.17 kcal / mol,分别。应推断出用于N(4)原子上的负电荷与H键的形成焓之间的相关性的数据可以暗示Coulomb相互作用是对分子间H键形成的主要贡献在三唑座。

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