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Liquid azo dyes
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DOI：10.1016/j.dyepig.2015.10.024.png)
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Abstract
En 中文
Any liquid azo dyes, in which auxochrome such as dialkylamino, alkoxy, and amino group is attached in a molecule, were produced. In a series of 2-alkyl-4'-(dimethylamino)azobenzenes, the butyl, hexyl, octyl, and dodecyl derivatives were liquid at room temperature, whereas the propyl, 1-methylethyl, 1-methylpropyl, 1,1-dimethylethyl, and octadecyl derivatives were solid. Thus, it is essential for liquid azo dyes to have a medium n-alkyl group at the 2-position. In a series of 2-butyl-4'-(dialkylamino) azobenzenes, the dimethylamino, diethylamino, dibutylamino, dioctylamino, and didodecylamino derivatives were liquid. 2-Butyl-4'-methoxyazobenzene and 4-amino-3,5-dimethy1-2'-butylazobenenzne were also liquid, whereas 2-butyl-4'-hydroxyazobenznene, 4-amino-2'-butylazobenzene, and 2-butyl-4'-(methylamino)azobenzene were solid. The prevention of pi-pi stacking, alkyl alkyl interactions, and intermolecular hydrogen bond could produce liquid azo dyes. (c) 2015 Elsevier Ltd. All rights reserved.
Keywords:
Azo dyes
Melting point
Single X-ray crystallography
pi-pi-Stacking
Hydrogen bond
Glass transition temperature
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