Since C-H bonds don't hydrogen bond very well, you don't see that … Alcohols and amines are fairly easy to identify in the IR spectrum, based on their relative locations and shapes.
IR Spectroscopy Tutorial: Alcohols Alcohols have characteristic IR absorptions associated with both the O-H and the C-O stretching vibrations. Pigments; Fillers; Binders; Pigment + linseed oil; Coating materials; Conservation materials; Textile fibres; Publications; Contact; Acknowledgments; Home » Conservation materials » Ethanol. Home; Paint components . When run as a thin liquid film, or "neat", the O–Hstretch of alcohols appears in the region 3500-3200 cm-1and is a very intense, broad band.

Ethanol. Nitrile C=N Stretch primary alcohol: C-O stretching: 1085-1050: strong : primary amide: C=O stretching: 1690: … Because protons are shared to varying extent with neighboring oxygens, the covalent O-H bonds in a sample of alcohol all vibrate at slightly different frequencies and show up at slightly different positions in the IR spectrum. Instead of seeing one sharp peak, you see a whole lot of them all smeared out into one broad blob. The C–Ostretch shows up in the region 1260-1050 cm-1. The first thing you’ll notice is that both of these functional groups appear to the left of the C-H absorptions, which always occur between 2,800 cm–1 to 3,000 cm–1 in …
ATR-FT-IR spectra of conservation-related materials in the MID-IR and FAR-IR region. Alcohol/Phenol O-H Stretch: 3550 - 3200 (broad, s) See "Free vs. Hyrdogen-Bonded Hydroxyl Groups" in the Introduction to IR Spectra for more information: Carboxylic Acid O-H Stretch: 3000 - 2500 (broad, v) Amine N-H Stretch: 3500 - 3300 (m) Primary amines produce two N-H stretch absorptions, secondary amides only one, and tetriary none.


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