Arylide yellow

Arylide yellow
 
About these coordinates     Color coordinates
Hex triplet#E9D66B
sRGBB (r, g, b)(233, 214, 107)
HSV (h, s, v)(51°, 54%, 91%)
CIELChuv (L, C, h)(85, 71, 76°)
Source[1] [2]
ISCC–NBS descriptorBrilliant greenish yellow
B: Normalized to [0–255] (byte)

Arylide yellow, also known as Hansa yellow and monoazo yellow, is a family of organic compounds used as pigments. They are primarily used as industrial colorants including plastics, building paints and inks. They are also used in artistic oil paints, acrylics and watercolors. These pigments are usually semi-transparent and range from orange-yellow to yellow-greens. Related organic pigments are the diarylide pigments. Overall, these pigments have partially displaced the toxic cadmium yellow in the marketplace. Painters such as Alexander Calder and Jackson Pollock are known to have employed arylide yellow in their artworks.[1]

Production

The compound is obtained by azo coupling of aniline and acetoacetanilide or their derivatives. The class of compounds was discovered in Germany in 1909. The initially formed diazo compound tautomerizes to give a ketohydrazone, which features extended pi-conjugation.[2]

formation of Hansa pigments by diazotization followed by tautomerization

Examples

Members of this class include:

Artists Pigments

Several monoazo yellows are used as artists' pigments, frequently marketed under the names 'Hansa' or Arylide.[3] These include:

  • PY1[4]
  • PY2[5]
  • PY3 Hansa Yellow Light or Lemon Yellow[6]
  • PY4[7]
  • PY5[8]
  • PY6[9]
  • PY10[10]
  • PY60[11]
  • PY65 Hansa Yellow Deep or Indian Yellow[12]
  • PY74 Hansa Yellow Medium or Primary Yellow[13]
  • PY82[14]
  • PY97 Hansa Yellow Medium or Hansa Yellow Deep[15]

See also

References

  1. ^ Arylide Yellow, Colourlex
  2. ^ K. Hunger. W. Herbst "Pigments, Organic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. doi:10.1002/14356007.a20_371
  3. ^ https://www.handprint.com/HP/WCL/pigmt1d.html#monoazo
  4. ^ https://artistpigments.org/pigments/PY1
  5. ^ https://artistpigments.org/pigments/PY2
  6. ^ https://artistpigments.org/pigments/PY3
  7. ^ https://artistpigments.org/pigments/PY4
  8. ^ https://artistpigments.org/pigments/PY5
  9. ^ https://artistpigments.org/pigments/PY6
  10. ^ https://artistpigments.org/pigments/PY10
  11. ^ https://artistpigments.org/pigments/PY60
  12. ^ https://artistpigments.org/pigments/PY65
  13. ^ https://artistpigments.org/pigments/PY74
  14. ^ https://artistpigments.org/pigments/PY82
  15. ^ https://artistpigments.org/pigments/PY97

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