Raman studies of some diunsaturated olefinic and acetylenic fatty acids and their derivatives.
The Raman spectra of CCl4 solutions of the 6,12; 7,12; 8,12; 9,12; and 10,12 isomers of octadecadiynoic acid and of the octadecadienoic acid methyl esters of both the cis,cis and trans,trans series are reported. Provided that there are two or more methylene groups between the unsaturated groups, the double and triple bond vibrational wavenumber values are close to those found in monounsaturated derivatives. An attempt has been made to obtain a correlation between the relative intensities of the nu(CequalsC) and delta(CH2) bands and the ratio of the number of double bonds to methylene groups in the molecule.
D005231:Fatty Acids, Unsaturated; D007536:Isomerism; D007834:Lasers; D008968:Molecular Conformation; D012542:Scattering, Radiation; D013057:Spectrum Analysis
D005231:Fatty Acids, Unsaturated