Amides, Proteins and Polypeptides
Amides, Proteins and Polypeptides
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酰胺、蛋白质和多肽
DOI：
10.1007/978-94-011-6017-9_12
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发表时间：
1975
期刊：
影响因子：
--
通讯作者：
L. J. Bellamy
中科院分区：
文献类型：
--
作者：
L. J. Bellamy
虽然有大量的共振指向偶极形式，但酰胺不会烯化，因此它们表现出羰基吸收，其频率将在一定程度上受到与之共振的偶极结构的影响。与羰基相邻的R基团的性质也会在较小程度上影响它。这种吸收被称为酰胺I带，是所有类型的酰胺，包括环形式共同的。然而，它的频率明显受到氢键效应的影响，因此在从固体到溶液的过程中会发生相当大的变化。这对其他特性酰胺带的作用更大，因此，在酰胺和相关材料的相关工作中，必须特别注意材料被检测时的物理状态。
Although there is a good deal of resonance towards a dipolar form, amides do not enolise so that they show a carbonyl absorption, the frequency of which will be influenced to some extent by the dipolar structure with which it can resonate. It will also be affected to a lesser extent by the nature of the R group adjacent to the carbonyl. This absorption is termed the amide I band and is common to all types of amide, including cyclic forms. Its frequency is, however, markedly affected by hydrogen-bonding effects, so that considerable shifts can occur on passing from the solid to solution. This applies with even greater force to the other characteristic amide bands, so that in correlation work on amides and related materials particular attention must be paid to the physical state in which the material is examined.