Vibrational spectra ethyl groups

Used as foam boosters in conjunction with anionic actives, these compounds contain one or two ethyl alcohol groups attached to the nitrogen atom of a long-chain alkyl amide. Monoethanolamides are secondary amides and therefore exhibit typical amide I and amide II bands at 1650 and 1560 cm" as well as an N-H stretch at 3090 cm" (Figure 10.18). The spectrum also contains a strong, broad O-H stretch centred near 3400 cm" and C-O vibrations at 1070 cm"Diethanola-mides do not exhibit any N-H features— no 3100 cm" band and only one peak between 1700 and 1500 cm" (Figure 10.19). 

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