Why Nujol is used in IR spectroscopy?
For very reactive samples, the layer of Nujol can provide a protective coating, preventing sample decomposition during acquisition of the IR spectrum.
Does water affect IR spectrum?
Presence of water in sample significantly distort IR spectrum of compound. Moreover, KBr and ZnSe optical acessories (prism, beam splitter) used in IR spectrometer are also water sensitive, it can permanently damage them.
How do you make a KBr pellet for IR?
Take about 1/8” of the solid sample on a microspatula and about 0.25-0.50 teaspoons of KBr. Mix thoroughly in a mortar while grinding with the pestle. If the sample is in large crystals, grind the sample separately before adding KBr. Place just enough spl. to cover bottom in pellet die.
Why is water not used in IR?
Water cannot be used as a solvent for ir spectroscopy because: 1- Water has two strong infrared absorption peaks. 2- Water is a strongly polar solvent that dissolves the alkali halide disks commonly used for IR.
Is water opaque to IR?
Water is strongly absorbing at most of the wavelengths in the electromagnetic spectrum, but it has a narrow window of transparency which includes the visible spectrum. In the infrared it exhibits strong absorptions from vibrations of the water molecule.
How is Nujol oil used in infrared spectroscopy?
Nujol is a brand of mineral oil by Plough Inc., cas number 8012-95-1, and density 0.838 g/mL at 25 °C, used in infrared spectroscopy. It is a heavy paraffin oil so it is chemically inert and has a relatively uncomplicated IR spectrum, with major peaks between 2950-2800, 1465-1450, and 1380–1300 cm−1. (2n + 2) where n is very large.
What is the IR absorptions given by Nujol?
What is Nujol explain the IR absorptions given by Nujol? Nujol is a brand of mineral oil by Plough Inc., cas number 8012-95-1, and density 0.838 g/mL at 25 °C, used in infrared spectroscopy.
What is the density of Nujol mineral oil?
Nujol is a brand of mineral oil by Plough Inc., cas number 8012-95-1, and density 0.838 g/mL at 25 °C, used in infrared spectroscopy. It is a heavy paraffin oil so it is chemically inert and has a relatively uncomplicated IR spectrum, with major peaks between 2950-2800, 1465-1450, and 1380–1300 cm−1.
How is a Nujol Mull made in chemistry?
A nujol mull is obtained by grinding up the solid and mixing it with mineral oil to form a suspension, which placed in between AgCl, NaCl, KBr or CsI plates. Likewise, what is a Nujol in chemistry?