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Raman spectra and conformations of n-hexadecynoic fatty acids and their potassium salts

✍ Scribed by M. Van De Ven; H. Van Langen; W. Verwer; Y.K. Levine

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
624 KB
Volume
34
Category
Article
ISSN
0009-3084

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✦ Synopsis

Raman spectra of n-hexadecynoic fatty acids, CH3(CH2)m-2C ~-C(CH2), _2COOH (with n = 4,6,7, 8 and 12, m + n = 16) and their potassium salts were recorded and assigned. The skeletal optical mode (SOM) regions were analysed on using the dispersion curve of the ~'4 (stretch) vibrations of saturated fatty acids. The Iocalised vibrations of the carboxyl-and methyl-terminated sections of the hydrocarbon chains were assigned to the phase ditierences 8 = kzr/m and k~r/n (k = 1, 2 .... ), respectively. Evidence for a ~'4 vibration with 6 = ~r/2m was found. The materials were found to be resistant to chemical decomposition under laser illumination.

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## Abstract Raman and infrared measurements were performed on hydrated (H~2~O and D~2~O) and anhydrous (CH~3~)~2~NCSCOOK together with their CD~3~‐substituted analogues. Close scrutiny of the water fundamentals indicated that the C~2__v__~ symmetry of the single water molecule is lost owing to diff