Azobenzene


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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.

References in periodicals archive ?
64) Additionally, two alanine mutations (R139A and K140A) were introduced to avoid the steric effects on the helical structure induced by the formation of the azobenzene bridge.
UV light is shone on the system, which causes the azobenzene part of the first ligand to change shape to a less stable cis form.
1te 1,1,1-Trichloroethane, technical grade 71-55-6 2dc 1,2-Dichloroethane 107-06-2 3,3'-Dimethoxybenzidine [multiplied by] 3db 2HCI 20325-40-0 aid Aldrin 309-00-2 ant 2-Amino-5-nitrothiazole 121-66-4 apc Aspirin, phenacetin, and caffeine 8003-03-0 azb Azobenzene 103-33-3 azc 5-Azacytidine 320-67-2 b38 C.
Reaction of the latter with a bis-hydroxyalkyl substituted azobenzene monomer is reported to produce a main chain liquid crystalline polymer with low transition temperatures and enhanced mesophase stability.
azobenzene membrane forms on the substrate's surface.
PHOTO-INDUCED ALIGNMENT OF AZOBENZENE DYES IN POLYMER ULTRATHIN FILMS FABRICATED BY ALTERNATE POLYELECTROLYTE DEPOSITION: ALIGNMENT LAYERS AND FILM MORPHOLOGY.
Optical tuning of extraordinary optical transmission through a metallic hole array using azobenzene dye-doped nematic liquid crystal.
The four project areas will be supported by efforts to further develop and optimize the utilized azobenzene and diarylethene photochromic components.
To make the nanomotor, the researchers combined a DNA molecule they created in the lab with azobenzene, a chemical compound that responds to light.
On the other hand, absolute pressure of about 50 to 500 mm of Hg leads to incomplete conversion of Nitrobenzene with increased selectivity to desirable products, with reduction of impurities (like Phenazine, Azobenzene etc.