Dyes derived from aminothiophenes .5. Spectral properties of some nitro-substituted thiophene-based azo disperse dyes

被引：16

作者：

Hallas, G

Towns, AD

机构：

[1] Dept. of Colour Chemistry and Dyeing, University of Leeds

来源：

DYES AND PIGMENTS | 1997年 / 34卷 / 02期

关键词：

nitro-substituted aminothiophenes; heterocyclic azo dyes; PPP-MO calculations; solvatochromism; halochromism;

D O I：

10.1016/S0143-7208(96)00073-3

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The spectroscopic properties of a series of nitro-substituted thienyl-2- and thienyl-3-azo dyes in neutral and acidic solution were examined In agreement with resonance theory and PPP-MO calculations, nitrothienyl-2-azo derivatives were found to be more bathochromic than analogues lacking nitro groups, Absorption intensities, half-band widths and positive solvatochromic shifts were also greater; additionally, the nitrothienyl-2-azo dyes exhibited negative halochromism. The nitrothienyl-3-azo dyes were hypso- and hypochromic relative to their thienyl-2-azo isomers. The spectra and halochromism of the 2,4-disubstituted dyes indicated the presence of steric hindrance. (C) 1997 Elsevier Science Ltd.

引用

页码：133 / 146

页数：14

共 20 条

[1]

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