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Nujol - high-boiling paraffin oil, mainly used for the preparation of solid specimens in both IR spectroscopy and Raman spectroscopy. It is a heavy paraffin oil, very passive chemically (does not react with most compounds). The advantage of using nujol is its low price and simplicity. A solid sample is triturated with a few drops of nujol in agate mortar to obtain a homogeneous slurry that is placed as a thin film (film) between two plates, eg NaCl or KBr. The disadvantage of IR measurements in nujol is the appearance of absorption bands coming from nujol itself:

In order to avoid the above problem, the measurements of the slurry in two different oils are most common, for example, in addition to nujol, fluorolub (Fluorolube, chlorotrifluoroethylene polymerised to form an oil) is used, which does not contain CH bonds, so it does not absorb within the range 2950-2800 cm . Fluorine, in turn, absorbs infrared radiation at lower wavelength values. Modern infrared sensors are computer-coupled to allow the left-hand portion of the nujol and right-handed fluorolubie to be combined to produce a full spectrum of the compound to be absorbed without absorbing the dispersing oil. A large amount of the test substance necessary for the measurement, ie about 20-50 mg of the compound, can be considered as a disadvantage, while for example, the spectra of KBr (test compound and KBr pressed in the form of pellets) are required for the preparation. -2 mg of the compound. The advantage of such a large number of substances is better spectrum quality and a much more subtle structure of absorption bands.

Nujol is also used as a matrix in photolytic processes of transition metal complexes.

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