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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Intramolecular hydrogen bonding of the C-terminal NH_2 groups of small peptide amides in solution
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Intramolecular hydrogen bonding of the C-terminal NH_2 groups of small peptide amides in solution

机译：溶液中小肽酰胺C端NH_2基团的分子内氢键

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摘要

Infrared and NMR measurements were performed for various small peptide amides in chloroform solutions. From comparison of the infrared NH stretching absorption of the various peptide amides, a band observed in the 3480-3490 cm~-1 range was assigned to the counterpart of the low-wavenumber broad band assigned to the hydrogen-bonded NH stretching of the C-terminal NH_2 group. On the basis of a simple vibrational model for the NH stretchings of the NH_2 group, the force constants were estimated from the observed wavenumbers for the symmetric and antisymmetric stretchings of the NH_2 groups, and effect of the hydrogen bond on these NH stretchings was discussed. The results have shown that one of the two NH of the C-terminal NH_2 group takes part in an intramolecular hydrogen bond while the other NH is almost free from the hydrogen bond. NMR chemical shifts of the two NH protons of the NH_2 groups provided support to the infrared results.
机译：在氯仿溶液中对各种小肽酰胺进行了红外和NMR测量。通过比较各种肽酰胺的红外NH拉伸吸收，将在3480-3490 cm-1范围内观察到的谱带分配给与C的氢键合NH拉伸对应的低波数宽带对应的谱带。 -末端NH_2基团。基于一个简单的NH_2基团NH键伸缩振动模型，从观察到的NH_2基团对称和非对称伸缩波数估算力常数，并讨论了氢键对NH_2基团拉伸的影响。结果表明，C-末端NH_2基团的两个NH之一参与分子内氢键，而另一个NH几乎没有氢键。 NH_2基团的两个NH质子的NMR化学位移为红外结果提供了支持。

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