An Electron Spin Resonance Study of the Photolysis of Dyed Wool

Publisher Website
Google Scholar
Abstract
By means of temperature‐dependence studies of e.s.r. spectra it has been found possible to distinguish between the wool signal and the dye signal when dyed wool is subjected to ultra‐violet irradiation. Two different observable patterns of behaviour were noted, allowing the dyes to be divided into two classes. The Class I dyes (e.g. azo, triphenylmethane dyes) gave e.s.r. spectra characteristic of the wool alone, despite the fact that there was evidence of both dye fading and dye‐radical formation. Class II dyes gave e.s.r. responses characteristic of radicals in the dye and the wool. The two types of radicals were formed independently after the dye and wool had competed for the light energy available. These findings have been explained in terms of the photoconductivity behaviour of the dyes.

This publication has 6 references indexed in Scilit: