Studies on UV/Vis Absorption Spectra of Azo Dyes. 24. The different effect of a 2‐methoxy and a 3‐methoxy group in 4‐N.N‐diethylaminoazobenzenes on colour
作者:
Heinz Mustroph,
Frank Gussmann,
期刊:
Journal für Praktische Chemie
(WILEY Available online 1990)
卷期:
Volume 332,
issue 1
页码: 93-97
ISSN:0021-8383
年代: 1990
DOI:10.1002/prac.19903320110
出版商: WILEY‐VCH Verlag GmbH
数据来源: WILEY
摘要:
AbstractA number of 2‐ and 3‐methoxy‐substituted‐4‐N.N‐diethylaminoazobenzenes have been prepared and their absorption maxima in ethanol and toluene compared with the corresponding 4‐N.N‐diethylaminoazobenzenes. Both the 2‐ and 3‐methoxy groups cause a bathochromic shift, but the bathochromic shift of a 3‐methoxy group depends on the substituents in the diazo component. With increasing electron‐withdrawing strength of the substituents in the diazo component a progressive enhancement of bathochromic shift appears. In toluene all 3‐methoxy‐substituted dyes absorb at longer wavelengths compared with the
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