Phthalocyanine Green G

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Phthalocyanine Green G
Phthalocyanine Green G.png
Names
Other names
phthalo green, viridian hue, pigment green 7, copper phthalocyanine green, C.I. pigment green 7, non-flocculating green G, polychloro copper phthalocyanine, and C.I. 74260, copper hexadecachlorophthalocyanine
Identifiers
  • 14832-14-5
ECHA InfoCard 100.014.114
Properties
C24Cl16CuN8
Molar mass 1,031.07 g·mol−1
Appearance green solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Phthalo green
 
Phthalocyanine green.jpg
Phthalocyanine green pigment
About these coordinates     Colour coordinates
Hex triplet #123524
sRGBB  (rgb) (18, 53, 36)
CMYKH   (c, m, y, k) (82, 51, 80, 64)
HSV       (h, s, v) (151°, 66%, 21%)
Source The Mother of All HTML Colo(u)r Charts
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Phthalocyanine green G, which has many commercial names, is a synthetic green pigment from the group of phthalocyanine dyes, a complex of copper(II) with chlorinated phthalocyanine. It is a soft green powder, which is insoluble in water.[1] It is a bright, high intensity colour used in oil and acrylic based artist's paints, and in other applications.

Synthesis, properties, and production

Phthalocyanine green is derived from phthalocyanine blue by chlorination in the presence of aluminium trichloride. The stoichiometry for the complete chlorination is shown:[1]

Cu(C32H16N8) + 16 Cl2 → Cu(C32N8Cl14) + 16 HCl

In practice, this pigment is a mixture of isomers and degrees of chlorination. The 15th and 16th chlorides are difficult to install. The chemical formula usually ranges from C32H3Cl13CuN8 C32HCl15CuN8.

Owing to the presence of strongly electronegative chlorine substituents, the absorption spectrum is shifted from that of the parent CuPc. Phthalo green is highly stable, being resistant to alkali, acids, solvents, heat, and ultraviolet radiation.

Uses

Due to its stability, phthalo green is used in inks, coatings, and many plastics. In application it is transparent. Being insoluble, it has no tendency to migrate in the material. It is a standard pigment used in printing ink and packaging industry. It is also allowed in all cosmetics except those used around the eyes. It is used in some tattoos.

Related compounds

Copper phthalocyanine green 36 is a variant where some of the chlorine atoms are replaced with bromine. Bromination is less efficient than chlorination. Consequently the degree of bromination is lower.[1][2]

See also

References

  1. ^ a b c Löbbert, Gerd (2000). "Phthalocyanines". Ullmann’s Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a20_213. .
  2. ^ Phthalo Green: How Can You Tell If It's Always the Same? 1/7/2003 , Dr. Richard M. Podhajny, Ph.D. , pffc-online.com
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