What Colour is azobenzene?
Azobenzene
| PubChem CID | 2272 |
|---|---|
| Description | Azobenzene appears as orange-red crystals or dark brown chunky solid. (NTP, 1992) CAMEO Chemicals Azobenzene is a molecule whose structure comprises two phenyl rings linked by a N=N double bond; the parent compound of the azobenzene class of compounds. ChEBI |
Why is azobenzene not a dye?
It must have a stable and attractive colour. Example: Azobenzene (yellow colour) – unable to fix itself to a fibre, not a dye.
What is azobenzene used for?
These azobenzene-based compounds are also called diazenes and are used as dyes in various industries. Photoisomerization is the most interesting property of azobenzene and azobenzene-based compounds.
What is azo dye used for?
Azo dyes are widely used to treat textiles, leather articles, and some foods. Chemically related to azo dyes are azo pigments, which are insoluble in water and other solvents.
How do you make azobenzene?
Azobenzene has been prepared by many different methods, of which the following are representative. It may be obtained by the reduction of nitrobenzene with iron and acetic acid;1 with sodium amalgam;2 with alkali sulfides;3 with cellulose,4 molasses,5 or dextrose5 in alkaline solution; and by catalytic reduction.
What is azobenzene soluble?
67.88 °C (trans), 71.6 °C (cis) Boiling point. 300 °C (572 °F; 573 K) Solubility in water. 6.4 mg/L (25 °C)
Is azobenzene safe to use?
Ingestion: Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. Azobenzene induced invasive sarcomas in the spleen and other abdominal organs in male and female rats following dietary administration.
What are the main hazards of azobenzene?
This chemical is sensitive to air and light. Dust may form an explosive mixture in air. Insoluble in water. SYMPTOMS: Symptoms of exposure to this compound may include irritation of the skin, eyes and respiratory tract; liver and kidney damage; liver and lung cancer; and possible blood disorders.
Is azobenzene toxic?
Ingestion: Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. Azobenzene induced invasive sarcomas in the spleen and other abdominal organs in male and female rats following dietary administration. Inhalation: May cause respiratory tract irritation.
Is azo dye harmful?
Some azo dyes can be carcinogenic without being cleaved into aromatic amines. However, the carcinogenicity of many azo dyes is due to their cleaved product such as benzidine. Benzidine induces various human and animal tumors. Another azo dye component, p-phenylenediamine, is a contact allergen.
Why are azo dyes banned?
The European Commission has adopted a proposal to restrict the use of azo dyes, a group of 43 chemicals that can cause cancer, and are dangerous to human genes or reproduction if used carelessly. Azo dyes are used in special paints, printing inks, varnishes and adhesives.
Does water dissolve azobenzene?
Azobenzene is a photoswitchable chemical compound composed of two phenyl rings linked by a N=N double bond. It is the simplest example of an aryl azo compound….Azobenzene.
| Names | |
|---|---|
| Solubility in water | 6.4 mg/L (25 °C) |
| Acidity (pKa) | -2.95 |
| Magnetic susceptibility (χ) | -106.8·10−6 cm3/mol |
| Refractive index (nD) | 1.6266 (589 nm, 78 °C) |
How are azobenzene dyes used in photoresponsive material systems?
Azobenzene dyes are organic compounds that contain the photoreactive -N=N- group, which undergoes reversible trans – cis – trans isomerization when irradiated by sunlight. Therefore, these compounds are used in photoresponsive material systems as phototriggers [ 10 ].
What kind of crystal is azobenzene made of?
Azobenzene appears as orange-red crystals or dark brown chunky solid. (NTP, 1992) Azobenzene is a molecule whose structure comprises two phenyl rings linked by a N=N double bond; the parent compound of the azobenzene class of compounds.
How long does it take for photo isomerization of azobenzene?
Photophysics of isomerization. The photo-isomerization of azobenzene is extremely rapid, occurring on picosecond timescales. The rate of the thermal back-relaxation varies greatly depending on the compound: usually hours for azobenzene-type molecules, minutes for aminoazobenzenes, and seconds for the pseudo-stilbenes.
What is the pseudo stilbene class in azobenzene?
The pseudo-stilbene class is characterized by substituting the 4 and 4′ positions of the two azo rings with electron-donating and electron-withdrawing groups (that is, the two opposite ends of the aromatic system are functionalized).