An Electron Spin Resonance Study of the Photolysis of Dyed Wool

Autor:	C. H. Nicholls, R. B. Coles
Rok vydání:	1976
Předmět:	Triphenylmethane genetic structures Polymers and Plastics Chemistry Radical Photoconductivity Photodissociation Photochemistry eye diseases law.invention chemistry.chemical_compound Wool law Light energy Irradiation Electron paramagnetic resonance
Zdroj:	Journal of the Society of Dyers and Colourists. 92:166-170
ISSN:	0037-9859
DOI:	10.1111/j.1478-4408.1976.tb03284.x
Popis:	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.
Databáze:	OpenAIRE
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