Infrared and Raman studies of some monounsaturated olefinic and acetylenic fatty acids and their derivatives
Infrared and Raman studies of some monounsaturated olefinic and acetylenic fatty acids and their derivatives
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一些单不饱和烯属和炔属脂肪酸及其衍生物的红外和拉曼研究
DOI：
10.1039/p29720001557
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发表时间：
1972
期刊：
影响因子：
--
通讯作者：
I. A. Ismail
中科院分区：
文献类型：
--
作者：
J. Davies;P. Hodge;J. Barve;F. Gunstone;I. A. Ismail
获得了 15 种异构体顺式十八烯酸甲酯、15 种异构体反式十八烯酸、十八烯酸甲酯和 16 种异构体十八氰酸的四氯化碳溶液的拉曼光谱 (800–3200 cm–1)。如果双键不与羰基共轭，并且不出现在末端位置，则双键振动对于顺式化合物在 1656 ± 1 cm-1 处产生强拉曼谱带，对于反式化合物在 1670 ± 1 cm-1 处产生强拉曼谱带。与羰基的共轭使该值降低 8 cm–1，对于末端双键，该值为 1642 cm–1。三键振动在 2232 ± 1 cm–1(s) 和 2291 ± 2 cm–1(m) 处产生两个拉曼带。当三键与羰基共轭时，仅在 2245 cm-1 处观察到一个谱带。末端三键在 2120 cm–1 处有一个单带。从 i.r. 的比较来看顺式和反式octadec-8-enoates的拉曼光谱建议对顺式和反式CHCH–单元的振动模式进行分配。
The Raman spectra (800–3200 cm–1) of carbon tetrachloride solutions of the 15 isomeric methyl cis-octadecenoates, the 15 isomeric trans-octadecenoic acids, methyl octadec-17-enoate, and of the 16 isomeric octadecynoic acids have been obtained. Provided that the double bond is not conjugated with the carbonyl group, and does not occur in the terminal position, the double-bond vibration gives rise to a strong Raman band at 1656 ± 1 cm–1 for the cis-compounds, and to a strong band at 1670 ± 1 cm–1 for the trans-compounds. Conjugation with the carbonyl group lowers the value by 8 cm–1, and for the terminal double bond the value is 1642 cm–1. The triple-bond vibration gives rise to two Raman bands at 2232 ± 1 cm–1(s) and 2291 ± 2 cm–1(m). When the triple bond is conjugated with the carbonyl group only one band at 2245 cm–1 is observed. The terminal triple bond gives a single band at 2120 cm–1. From a comparison of the i.r. and Raman spectra of the methyl cis- and trans-octadec-8-enoates an assignment is suggested for the vibrational modes of the cis- and trans-CHCH– units.