Here the auxochrome (-OH ) is conjugated with the chromophore-NO 2.
2.
The presence of an auxochrome in the chromogen molecule is essential to make a dye.
3.
An auxochrome helps a dye to bind to the object that is to be colored.
4.
But Para-hydroxynitrobenzene exhibits a deep yellow color, in which-OH group acts as an auxochrome.
5.
However, if an auxochrome is present in the meta position to the chromophore, it does not affect the color.
6.
Electrolytic dissociation of the auxochrome group helps in binding and it is due to this reason a basic substance takes an acidic dye.
7.
An auxochrome is a functional group of atoms " with nonbonded electrons " when attached to a chromophore, alters both the wavelength and intensity of resonance.
8.
An auxochrome is known as a compound that produces a bathochromic shift, also known as red shift because it increases the wavelength of absorption, therefore moving closer to infrared light.
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