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 ?
Samorl, "Azobenzenes as light-controlled molecular electronic switches in nanoscale metal-molecule-metal junctions," Journal of the American Chemical Society, vol.
Then, a series of azo polymers with different substituents at 4'-positions of the azobenzene units were prepared by the azo-coupling reaction from that precursor.
Yoon, "Synthesis and surface-active properties of new photosensitive surfactants containing the azobenzene group," Journal of Colloid and Interface Science, vol.
Herein, we report on the isolation of kojic acid from sago waste and utilized it as a precursor for the synthesis of kojic acid ester bearing chalcone 3a-c and azobenzene 5a-d moieties.
(2015) Structure-Correlation NMR Spectroscopy for Macromolecules Using Repeated Bidirectional Photoisomerization of Azobenzene. Anal.
A remarkably clever alternative avoids the presence of a photoinitiator or other chemical compounds by modulating the conformation of an azobenzene in a PEG hydrogel backbone.
Photoinduced wettability changes have been demonstrated for the most commonly studied chromophores azobenzene [7-10] and spiropyran [5, 6].
Organic dye such as azobenzene has outstanding chromophores with strong absorption in visible region and intrinsic advantages of good photo and thermal stability [11, 12].
In order to study the heart disorder, Agladze's team created "arrhythmia in vitro", using azoTAB (azobenzene trimethylammonium bromide) whose molecule consists of two benzene rings connected by a bridge of two nitrogen atoms, said the study published in the journal PLOS ONE.
HPLC-FLD--chromatogram of standard solution of a) 3,3'-dimethylbenzidene (DMB) (with concentration of 100 [micro]g/ml) in the presence of: b) 1,4-phenylenediamine, c) benzidine, d) aniline, e) 3,3'-dimethoxybenzidine, f) 2-nitrotoluene (without peak), g) 3,3'-dichlorobenzidine and h) azobenzene (without peak)
The aromatic substitution reactions are not limited to azobenzene and benzylidene but are even more facile with N,N-dimethylbenzylamine [13,14].
The Sonochemical Degradation of Azobenzene and Related Azo Dyes: Rate Enhancements via Fenton's Reactions.