Pigment Yellow 83
Color Index Pigment Yellow 83 is an organic compound that is classified as a diarylide pigment. It is used as a yellow colorant.
Production
The compound is produced industrially from three components: Treatment of 2,5-dimethoxy-4-chloroaniline with diketene gives an acetoacetylated aniline. This compound is then coupled to the bisdiazonium salt obtained from 3,3'-dichlorobenzidine.Properties
Pigment Yellow 83 is a slightly flammable yellow solid that is practically insoluble in water. It decomposes when heated above 300 °C. It exhibits a crystal structure belonging to the space group P21/c or space group Pc.Martin U. Schmidt, Robert E. Dinnebier, Holger Kalkhof: Crystal Engineering on Industrial Diaryl Pigments Using Lattice Energy Minimizations and X-ray Powder Diffraction. In: The Journal of Physical Chemistry B. 111, 2007, S. 9722,.As confirmed by X-ray crystallography, the compound exists as a bis tautomer, not a true diazo compound.