Nujol

safety instructions
CAS number	8042-47-5
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases

Nujol is a colorless, oily liquid. As a representative of the paraffin oils , it is a mixture of long-chain alkanes .

Nujol is used as a suspending agent in infrared spectroscopy . It is well suited for this due to its following properties:

As a heavy paraffin oil, Nujol is chemically inert to many substances under normal conditions . It also forms a protective layer against reactive substances and prevents their disintegration during the measurement process.

Nujol has a relatively simple absorption spectrum in the infrared. Its bands lie between 2950 and 2750 (s), 1465–1450 (m), 1380–1370 (m) and 620 (w) cm ⁻¹ ( wavenumbers ), which are caused by CH ₂ and CH ₃ oscillations. The bands usually do not overlap the characteristic bands of the test substance.

Transparent, homogeneous emulsions of nujol and solids can be produced by triturating the substance in nujol. When producing Nujol triturations, oversaturation of the IR spectrum by Nujol should be avoided, as the spectrum of the substance can be falsified. Oversaturation occurs particularly with high levels of Nujol (> 100: 1).

The refractive index of Nujol is: . ${\ displaystyle n_ {D} ^ {20} = 1 {,} 48}$

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