Pigment Yellow 74
chemical compound
Pigment Yellow 74 (C.I. 11741) is an azo dye and classified as an arylide yellow. It is an intensely yellow-green solid.
Extraction and presentation
Pigment Yellow 74 is prepared by azo coupling of diazotization 4-nitro-o-anisidine to 2-acetoacetanisidide.
Properties
Pigment Yellow 74 is a flammable, hardly flammable, yellow solid that is practically insoluble in water. It decomposes when heated above > 290 °C. It has a triclinic crystal structure with the space group P1 or space group P-1 and the lattice parameters a = 16.06 ± 0.16 Å, b = 7.71 ± 0.08 Å, c = 14.977 ± 0.15 Å. The crystals of the compound are pleochroism. In polarized light, they exhibit an orange glow when the long axis of the crystals is perpendicular to the plane of polarization, as opposed to the case where the long axis of the crystals is parallel to the plane of polarization.
It is a flat molecule, enforced by the hydrogen-bonding via the ketohydrazide group.
Use
Pigment Yellow 74 is used for printing inks and varnishs. The light fastness of fine-grained pigments of the compound is 2 to 3 fastness levels on the blue scale better than that of similar disazo yellow pigments, which is why these are preferably used when high light fastness is required, as is often the case in packaging printing. Similar to the other representatives of this pigment class, the solvent fastnesses are often less satisfactory.
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