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
✍ Scribed by Dr. Heinz Mustroph; Frank Gussmann
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 231 KB
- Volume
- 332
- Category
- Article
- ISSN
- 1615-4150
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
A 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 2‐methoxy‐substituted dyes.