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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Twofold Hydrogen Bridges as Observed in Amide-Templated Rotaxanes
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Twofold Hydrogen Bridges as Observed in Amide-Templated Rotaxanes

机译：酰胺模板的轮烷中观察到的双氢桥

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摘要

Hydrogen bridges of the type X-H…A…H-X, as have been observed in amide-templated rotaxanes, are investigated. The acceptors A are systematically varied by electron withdrawing and electron donating substitutions. A fairly linear relationship between the charge on A or its 1s energies with the bonding strength of the hydrogen bridges is found as long as the X-H moieties retained their character and are placed in a sterically favorable position. The strength of the twofold bridges is about 1.5 times that of a corresponding single hydrogen bond. Changes in the relative position of the two H-H moieties relative to the acceptor A show that steric requirements can dominate charge-transfer properties in hydrogen bonding and point out the importance of proper steric concordance in twofold hydrogen bridges. A search for twofold bridges in biological systems is suggested.
机译：如在酰胺模板的轮烷中所观察到的，研究了X-H…A…H-X型氢桥。受体A通过吸电子和给电子取代系统地变化。只要X-H部分保持其特性并位于空间上有利的位置，就会发现A或其1s能量上的电荷与氢桥的键合强度之间存在相当线性的关系。双重桥的强度是相应的单个氢键的强度的约1.5倍。两个H-H部分相对于受体A的相对位置的变化表明，空间要求可以控制氢键中的电荷转移性质，并指出在双重氢桥中适当的空间一致性的重要性。建议在生物系统中寻找双重桥梁。

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