Everything about Nujol totally explained
Nujol is a brand of mineral oil by Plough, Inc. used in
infrared spectroscopy. It is a heavy
paraffin oil so it's chemically
inert and has a relatively uncomplicated
IR spectrum, with major peaks between 2950-2800, 1465-1450, and 1380-1370 cm
-1.
To obtain an IR spectrum of a solid, a sample is combined with Nujol to make a mull (a very thick
suspension), and is usually sandwiched between potassium- or sodium chloride plates before being placed in the spectrometer. For very reactive samples, the layer of Nujol can provide a protective coating, preventing sample decomposition during acquisition of the IR spectrum. When preparing the sample it's important to keep the sample from being over saturated with Nujol, this will result in erroneous spectra since the Nujol peaks will dominate, silencing the actual sample's peaks.
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