Phthalocyanine Blue BN
Monastral blue, phthalo blue, thalo blue
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||576.082 g·mol−1|
|Appearance||dark blue solid|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Phthalocyanine blue pigment powder
|HSV (h, s, v)||(233°, 100%, 54%)|
|sRGBB (r, g, b)||(0, 15, 137)|
|CMYKH (c, m, y, k)||(100, 98, 16, 14)|
|Source||The Mother of All HTML Colo(u)r Charts|
|ISCC–NBS descriptor||Vivid blue|
|B: Normalized to [0–255] (byte)|
H: Normalized to [0–100] (hundred)
Phthalocyanine Blue BN, also called by many names (EINECS 205-685-1), is a bright, crystalline, synthetic blue pigment from the group of phthalocyanine dyes. Its brilliant blue is frequently used in paints and dyes. It is highly valued for its superior properties such as light fastness, tinting strength, covering power and resistance to the effects of alkalis and acids. It has the appearance of a blue powder, insoluble in most solvents including water.
The discovery of metal phthalocyanines can be traced to the observation of intensely colored byproducts from reactions of benzene-1,2-dicarboxylic acid or its derivatives with sources of nitrogen and metals. CuPc (copper phthalocyanine) was first prepared in 1927 by the reaction of copper(I) cyanide and o-dibromobenzene, which mainly produces colorless phthalonitrile as well as an intensely blue by product. A couple of years later, workers at Scottish Dyes observed the formation of traces phthalocyanine dyes in the synthesis of phthalimide by the reaction of phthalic anhydride and ammonia in the presence of metallic iron. These findings led to the blue pigment sold under the trade name Monastral. Industrial production commenced in 1935 at ICI, I.G. Farbenindustrie, and DuPont.
Difficulty was experienced in forming stable dispersions with the first alpha forms, especially in mixtures with rutile titanium, where the blue pigment tended to flocculate. The beta form was more stable, as was the improved stabilized alpha form. Today, there are even more isomeric forms available.
Synonyms and trade names
The substance, chemical name (29H,31H-phthalocyaninato(2−)-N29,N30,N31,N32)copper(II) (or copper phthalocyanine), is also known as monastral blue, phthalo blue, helio blue, thalo blue, Winsor blue, phthalocyanine blue, C.I. Pigment Blue 15:2, copper phthalocyanine blue, copper tetrabenzoporphyrazine, Cu-phthaloblue, PB-15, PB-36, C.I. 74160, and British Rail Blue. Numerous other trade names and synonyms exist. The abbreviation "CuPc" is also used.
Due to its stability, phthalo blue is also used in inks, coatings, and many plastics. The pigment is insoluble and has no tendency to migrate in the material. It is a standard pigment used in printing ink and the packaging industry. Industrial production was of the order of 10,000 tonnes per annum in the 1980s and 1990s in Japan alone. The pigment is the highest volume pigment produced.
A common component on the artist's palette, phthalo blue is a cool blue with a bias towards green. It has intense tinting strength and easily overpowers the mix when combined with other colors. It is a transparent staining color and can be applied using glazing techniques.
CuPc has often been investigated in the context of molecular electronics. It is potentially suited for organic solar cells because of its high chemical stability and uniform growth. CuPc usually plays the role of the electron donor in donor/acceptor based solar cells. One of the most common donor/acceptor architectures is CuPc/C60 (buckminsterfullerene) which rapidly became a model system for the study of small organic molecules. Photon to electron conversion efficiency in such system reaches approximately 5%.
CuPc has also been investigated as a component of organic field-effect transistors. Copper Phthalocyanine (CuPc) has been suggested for data storage in quantum computing, due to the length of time its electrons can remain in superposition.
Approximately 25% of all artificial organic pigments are phthalocyanine derivatives. Copper phthalocyanine (CuPc) dyes are produced by introducing solubilizing groups, such as one or more sulfonic acid functions. These dyes find extensive use in various areas of textile dyeing (Direct dyes for cotton), for spin dyeing and in the paper industry. Direct blue 86 is the sodium salt of CuPc-sulfonic acid, whereas direct blue 199 is the quaternary ammonium salt of the CuPc-sulfonic acid. The quaternary ammonium salts of these sulfonic acids are used as solvent dyes because of their solubility in organic solvents, such as Solvent Blue 38 and Solvent Blue 48. The dye derived from cobalt phthalocyanine and an amine is Phthalogen Dye IBN. 1,3-Diiminoisoindolene, the intermediate formed during phthalocyanine manufacture, used in combination with a copper salt affords the dye GK 161. Phthalocyanine Blue BN is also used as a source material for manufacture of Phthalocyanine Green G.
Structure, reactivity and properties
Phthalocyanine blue is a complex of copper(II) with the conjugate base of phthalocyanine, i.e. Cu2+Pc2−. The description is analogous to that for copper porphyrins, which are also formally derived by double deprotonation of porphyrins. CuPc belongs to the D4h point group. It is paramagnetic with one unpaired electron per molecule.
The substance is practically insoluble in water (< 0.1 g/100 ml at 20 °C (68 °F)), but soluble in concentrated sulfuric acid. Density of the solid is ~1.6 g/cm3. The color is due to a π–π* electronic transition, with λmax ≈ 610 nm.
CuPc crystallizes in various forms (polymorphs). Five different polymorphs have been identified: phases α, β, η, γ and χ. The two most common structures in CuPc are the β phase and the metastable α phase. Those phases can be distinguished by the overlap of their neighboring molecules. The α phase has a larger overlap and thus, a smaller Cu-Cu spacing (~3.8 Å) compared to the β phase (~4.8 Å).
Toxicity and hazards
The compound is non-biodegradeable, but not toxic to fish or plants. No specific dangers have been associated with this compound. Oral LD50 in mammals is estimated to be greater than 5 g per kg, with no ill effects found at that level of ingestion, for chronic ingestion estimated dose of low concern was 0.2 mg/kg per day in rats. No evidence indicates carcinogenic effects. Sulfonated phthalocyanine has been found to cause neuroanatomical defects in developing chicken embryos when injected directly into incubating eggs.
- Phthalocyanine Green G
- British Rail corporate liveries § Rail Blue - use of the pigment as the standard livery for British Rail trains from 1965 onwards.
- The Joy of Painting - oil paint based on the pigment was frequently used on the show.
- List of colors
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- New material for quantum computing discovered out of the blue. phys.org. October 27, 2013
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- Quenqua, Douglas (November 4, 2013). "A Key to Quantum Computing, Close to Home". The New York Times.
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- Safety data sheet Archived 2012-02-28 at the Wayback Machine cornelius.co.uk
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