 Chemical structure of one of the components of Phthalocyanine Green G | |
| 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 | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.014.114 |
| EC Number |
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| UNII | |
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| Properties | |
| C32Cl16CuN8 | |
| Molar mass | 1127.15 g·mol−1 |
| Appearance | Green solid |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
| Phthalo green | |
|---|---|
 Phthalocyanine green pigment | |
 Colour coordinates | |
| Hex triplet | #123524 |
| sRGBB (r,g,b) | (18, 53, 36) |
| HSV (h,s,v) | (151°, 66%, 21%) |
| CIELChuv (L,C,h) | (19, 15, 146°) |
| Source | The Mother of All HTML Colo(u)r Charts[usurped] |
| ISCC–NBS descriptor | Very dark yellowish green |
| B: Normalized to [0–255] (byte) | |
Phthalocyanine green G, which has many commercial names, is a synthetic greenpigment from the group ofphthalocyanine dyes, acomplex ofcopper(II) with chlorinated phthalocyanine. It is a soft green powder, which is insoluble in water.[1] It is a bright, high intensity colour used inoil andacrylic based artist'spaints, and in other applications.
Phthalocyanine green is derived fromphthalocyanine blue by chlorination in the presence ofaluminium trichloride. The stoichiometry for the complete chlorination is shown:[1]
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 to C32HCl15CuN8.
Due to the presence of strongly electronegative chlorine substituents, the absorption spectrum is shifted from that of the parent copper phthalocyanine. Phthalo green is highly stable and resistant to alkali, acids,solvents, heat, andultraviolet radiation.
Due to its stability, phthalo green is used ininks,oil paint, coatings, and manyplastics. 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 legal[where?] in allcosmetics except those used around the eyes. It is used in sometattoos.
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]