Note the broad peak due to OH stretch superimposed on the sharp band due to CH stretch. OH bend from 1440-1395 and 950-910 cm -1The spectrum of hexanoic acid is shown below.The CO stretch appears in the region 1320-1210 cm -1, and the OH bend is in the region 1440-1395 cm -1 and 950-910 cm -1, although the 1440-1395 band may not be distinguishable from CH bending bands in the same region. The exact position of this broad band depends on whether the carboxylic acid is saturated or unsaturated, dimerized, or has internal hydrogen bonding. The carbonyl stretch C=O of a carboxylic acid appears as an intense band from 1760-1690 cm -1. The reason that the OH stretch band of carboxylic acids is so broad is becase carboxylic acids usually exist as hydrogen-bonded dimers. It puts Reason on par with other DAWs as far as VST performance. Thus a carboxylic acid shows a somewhat "messy" absorption pattern in the region 3300-2500 cm -1, with the broad OH band superimposed on the sharp CH stretching bands. Reason 10.3 is a much-anticipated update, because it addresses a significant performance issue with VST plug-ins without disrupting one of the things that makes Reason’s native devices work well. This is in the same region as the CH stretching bands of both alkyl and aromatic groups. Unlike the OH stretch band observed in alcohols, the carboxylic acid OH stretch appears as a very broad band in the region 3300-2500 cm -1, centered at about 3000 cm -1. IR: carboxylic acids IR Spectroscopy Tutorial: Carboxylic AcidsĬarboxylic acids show a strong, wide band for the OH stretch.
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