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 ?
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.
In this report, we describe the investigation of photo-induced alignment in ultrathin films consisting of azobenzene dyes and polyelectrolyte layers fabricated using the APD technique (or LAMSA).
The four project areas will be supported by efforts to further develop and optimize the utilized azobenzene and diarylethene photochromic components.
Azobenzene (AR) and dichloromethane (AR) were obtained form Sinopharm Chemical Reagent Co.
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.
During his doctoral research, Kevin investigated photo-responsive polymer systems based on azobenzene chromophores, and the mechanisms by which these polymers could be surface patterned by exposure to an interference pattern of light.
Dragan (Institute of Macromolecular Chemistry, Romania) collects information from the literature as well as original contributions in the field of ionic (co)polymers and hybrids such as self-assembled multilayers, ionic polymers containing azobenzene chromophore, phase separation processes, chelating ion exchangers, polymer electrolytes, functionalized solid surfaces, ionic hybrid hydrogels, and nanocomposites for polymer electrolytes.
In the study of Nystrom [10] experiments with aniline and azobenzene were carried out by extraction of the organic molecules from the aqueous phase into the oil phase of an oil/water emulsion and by subsequent ultrafiltration of the emulsion.
This difference is related to the difference of the linkage between the azobenzene groups and the polymer backbone, which are amide and ester bonds.
They consist of short protein molecules, or peptides, with azobenzene dye molecules attached.
This book reviews the cutting-edge significant research in the field of smart light-responsive materials based on azobenzene polymers and liquid crystals.