In this work the synthesis and characterization in solution and solid state of three heterocyclic oxamides and four amides capable of forming three center hydrogen bond (THB) interactions is described. The formation of THBs in solution was established and studied by multinuclear and VT 1H magnetic resonance, by which the Δδ/ΔT values could be directly related with proton mobility. The molecular structure of two oxamides in the solid state was determined by X-ray diffraction experiments. The results showed that amides with S(n)S(5)S(6) (n = 5, 6 for –OMe and –NO2 respectively) motifs were less prone to establish tautomeric equilibria in solution than those with the simpler S(n)S(5) motif.
本研究介绍了能够形成三中心氢键(THB)相互作用的三种杂环酰胺和四种酰胺在溶液和固态中的合成和特性。通过多核和 VT 1H 磁共振确定并研究了溶液中 THB 的形成,通过这种方法,Δδ/ΔT 值可与质子迁移率直接相关。通过 X 射线衍射实验确定了两种固态酰胺的分子结构。结果表明,具有 S(n)S(5)S(6)(n = 5,6 分别表示-OMe 和-
NO2)结构的酰胺比具有较简单的 S(n)S(5) 结构的酰胺更不容易在溶液中建立同分异构平衡。