Phthalocyanine green G, which has many commercial names, is a synthetic green
pigment
A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compou ...
from the group of
phthalocyanine dyes, a
complex
Complex commonly refers to:
* Complexity, the behaviour of a system whose components interact in multiple ways so possible interactions are difficult to describe
** Complex system, a system composed of many components which may interact with each ...
of
copper
Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...
(II) with chlorinated
phthalocyanine
Phthalocyanine () is a large, aromatic, macrocyclic, organic compound with the formula and is of theoretical or specialized interest in chemical dyes and photoelectricity.
It is composed of four isoindole units linked by a ring of nitrogen ato ...
. It is a soft green powder, which is insoluble in water.
[.] It is a bright, high intensity colour used in
oil
An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) & lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturated ...
and
acrylic
Acrylic may refer to:
Chemicals and materials
* Acrylic acid, the simplest acrylic compound
* Acrylate polymer, a group of polymers (plastics) noted for transparency and elasticity
* Acrylic resin, a group of related thermoplastic or thermosett ...
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
Aluminium chloride, also known as aluminium trichloride, is an inorganic compound with the formula . It forms hexahydrate with the formula , containing six water molecules of hydration. Both are colourless crystals, but samples are often conta ...
. The stoichiometry for the complete chlorination is shown:
[
:Cu(C32H16N8) + 16 Cl2 → Cu(C32N8Cl16) + 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 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, ]solvent
A solvent (s) (from the Latin '' solvō'', "loosen, untie, solve") is a substance that dissolves a solute, resulting in a solution. A solvent is usually a liquid but can also be a solid, a gas, or a supercritical fluid. Water is a solvent for ...
s, heat, and ultraviolet radiation
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays. UV radiation i ...
.
Uses
Due to its stability, phthalo green is used in ink
Ink is a gel, sol, or solution that contains at least one colorant, such as a dye or pigment, and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, reed pen, or quill. Thicker ...
s, oil paint
Oil paint is a type of slow-drying paint that consists of particles of pigment suspended in a drying oil, commonly linseed oil. The viscosity of the paint may be modified by the addition of a solvent such as turpentine or white spirit, and va ...
, coatings, and many plastic
Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...
s. 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
Cosmetics are constituted mixtures of chemical compounds derived from either natural sources, or synthetically created ones. Cosmetics have various purposes. Those designed for personal care and skin care can be used to cleanse or protect ...
except those used around the eyes. It is used in some tattoo
A tattoo is a form of body modification made by inserting tattoo ink, dyes, and/or pigments, either indelible or temporary, into the dermis layer of the skin to form a design. Tattoo artists create these designs using several tattooing ...
s.
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.[Phthalo Green: How Can You Tell If It's Always the Same?]
1/7/2003 , Dr. Richard M. Podhajny, Ph.D. , ''pffc-online.com''
See also
* ''The Joy of Painting
''The Joy of Painting'' is an American half-hour instructional television show created and hosted by painter Bob Ross which ran from January 11, 1983 to May 17, 1994. In most episodes, Ross taught techniques for landscape oil painting, completi ...
'' - oil paint based on the pigment was frequently used on the show.
* Copper phthalocyanine
Copper phthalocyanine (CuPc), also called phthalocyanine blue, phthalo blue and many other names, is a bright, crystalline, synthetic blue pigment from the group of phthalocyanine dyes. Its brilliant blue is frequently used in paints and dy ...
(blue)
* Lists of colors
These are the lists of colors;
* List of colors: A–F
* List of colors: G–M
* List of colors: N–Z
* List of colors (compact)
* List of colors by shade
* List of color palettes
* List of Crayola crayon colors
* List of RAL colors
* List of X ...
References
{{Shades of black
Pigments
Organic pigments
Phthalocyanines
Shades of green
es:Ftalocianina