The intensity of carbonyl bands in the infrared spectra of cyclic anhydrides of dicarboxylic acids
The intensity of carbonyl bands in the infrared spectra of cyclic anhydrides of dicarboxylic acids
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二羧酸环酐红外光谱中羰基带的强度
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
F. Marquardt
中科院分区：
文献类型：
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作者：
F. Marquardt
它示出，对于环状酸酐的芳香族二羧酸的低频和高频羰基伸缩带的强度之间的比率是相当小的脂肪族酸酐与酸酐环的相同大小。这一观察结果可能与分子的不饱和部分的π云可以以这样的方式离域的容易性有关，即它可以以对称拉伸模式与两个羰基基团共轭。
It is shown that for cyclic anhydrides of aromatic dicarboxylic acids the ratio between the intensities of the low-frequency and the high-frequency carbonyl stretching bands is considerably smaller than for aliphatic anhydrides with anhydride rings of the same size. This observation can be related to the ease with which the π-cloud of the unsaturated portion of the molecule can be delocalised in such a way that it can enter conjugation with both carbonyl groups in the symmetric streching mode.