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Qu'est-ce (qui) est azo- - définition
CLASS OF ORGANIC COMPOUNDS BEARING THE FUNCTIONAL GROUP R–N=N–R′, IN WHICH R AND R′ CAN BE EITHER ARYL OR ALKYL
Azo Compound; Azo compounds; Azo-dye; Azo group; Azo radical; Developed dye; Azo-; Azene
Azo-
·- A combining form of Azote.
II. Azo- ·- Applied loosely to compounds having nitrogen variously combined, as in cyanides, nitrates, ·etc.
III. Azo- ·- Now especially applied to compounds containing a two atom nitrogen group uniting two hydrocarbon radicals, as in azobenzene, azobenzoic, ·etc. These compounds furnish many artificial dyes. ·see Diazo-.
azo-
['e?z??]
¦ prefix Chemistry containing two adjacent nitrogen atoms between carbon atoms.
Origin
from obs. azote 'nitrogen', from Fr., from Gk a- 'without' + zoe 'life'.
Azo compound
Azo compounds are compounds bearing the functional group diazenyl (, in which R and R′ can be either aryl or alkyl).
Wikipédia
Azo compound
Azo compounds are organic compounds bearing the functional group diazenyl (R−N=N−R′, in which R and R′ can be either aryl or alkyl groups).
IUPAC defines azo compounds as: "Derivatives of diazene (diimide), HN=NH, wherein both hydrogens are substituted by hydrocarbyl groups, e.g. PhN=NPh azobenzene or diphenyldiazene." The more stable derivatives contain two aryl groups. The N=N group is called an azo group (from French azote 'nitrogen', from Ancient Greek ἀ- (a-) 'not', and ζωή (zōē) 'life').
Many textile and leather articles are dyed with azo dyes and pigments.
Exemples du corpus de texte pour azo-
1. The survey, published in The Food Magazine, found azo dye colourings in five products and multiple artificial sweeteners and preservatives in the majority of products.
2. Processing largely involves using volatile organic solvents, fungicides, azo dyes (possibly carcinogenic), huge amounts of groundwater pumped from precious wells in developing countries, and chromium (VI) – the substance that particularly riled Erin Brockovich.
3. A survey of 41 medicines found azo dye colourings in five products Most popular stories Health » Entire site » New contract leaves another 1.4m without an NHS dentist Victims of drug trial get ready to sue U.S firm for millions Is Pilates bad for your back?