azo dyes

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• azo dyes — azo dyes, a large group of synthetic dyes containing the grouping R N:N R, a basic structure of two atoms of nitrogen and two radicals of the benzene or naphthalene series, which can form subsequent, complex structures having a variety of dyeing… …   Useful english dictionary

• Azo violet — IUPAC name 4 (4 nitrophenyl)azobenzene 1,3 diol …   Wikipedia

• azo — [az′ō, ā′zō] adj. [< AZOTE] pertaining to or containing the divalent radical N:N [azo dyes] …   English World dictionary

• Azo compound — General chemical formula of azo compounds Azo compounds are compounds bearing the functional group R N=N R , in which R and R can be either aryl or alkyl. IUPAC defines azo compounds as: Derivatives of diazene (diimide), HN=NH, wherein both… …   Wikipedia

• azo dye — Chem. any of a large class of dyes containing one or more azo groups. [1880 85] * * * Any of a large class of synthetic organic compounds, dyes containing two nitrogen atoms joined by a double bond (see bonding, covalent bond) in the form ―N=N―… …   Universalium

• azo dye — n any of numerous dyes containing azo groups * * * any of a large group of synthetic dyes whose chromophore group is the structure N N …   Medical dictionary

• Azo — may refer to a number of topics:* For the chemistry functional group and class of compounds, see Azo compound. * A urinary tract analgesic also known as phenazopyridine. * For the medieval Italian jurist, see Azo of Bologna. * For the Georgian… …   Wikipedia

• azo rubine — ˌazōˈrüˌbēn, ˌāz , bə̇n noun Usage: usually capitalized A&R Etymology: az + Latin rubeus red + English ine more at ruby : a mordant acid azo dye that dyes wool bluish red called also carmoisin; see dye …   Useful english dictionary

• Azo- — Az o [See {Azote}.] (Chem.) A combining form of azote; (a) Applied loosely to compounds having nitrogen variously combined, as in cyanides, nitrates, etc. (b) Now especially applied to compounds containing a two atom nitrogen group uniting two… …   The Collaborative International Dictionary of English

• Azo coupling — An azo coupling is an organic reaction between a diazonium compound and a dialkylaniline (C6H5NR2), phenol or other aromatic compound which produces an azo compound.[1][2] In this reaction the diazonium salt is an electrophile and the activated… …   Wikipedia

• Azo (groupe fonctionnel) — Groupe azo Pour les articles homonymes, voir AZO. Le groupe azo est un groupe fonctionnel en chimie organique, de formule •N2+. C est un excellent groupe partant car il produit du diazote lors de son départ. Sommaire 1 Synthèse du groupe azo …   Wikipédia en Français