Azobenzene

(redirected from P-aminoazobenzene)
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Related to P-aminoazobenzene: alizarin dye

azobenzene

[‚a·zō′ben‚zēn]
(organic chemistry)
C6H5N2C6H5 A compound existing in cis and trans geometric isomers; the cis form melts at 71°C; the trans form comprises orange-red leaflets, melting at 68.5°C; used in manufacture of dyes and accelerators for rubbers.

Azobenzene

 

C6H5N = NC6H5 a very simple aromatic azocompound; orange-red crystals. A stable trans-isomer with a melting point of 68°C, insoluble in water, soluble in ether, ice-cold acetic acid, and concentrated sulfuric acid.

Azobenzene is not held by fibers and cannot be used alone as a dye. If amino- or oxy- groups are introduced into azobenzene molecules, simple azo dyes are formed. Azobenzene is obtained by the reduction of nitrobenzene in an alkaline solution of zinc dust or by the electrochemical method. Azobenzene is reduced to aniline through hy-drazobenzene as was established by N. N. Zinin in 1845. Azobenzene was discovered in 1834 by the German chemist E. Mitscherlich.