Abstract
In light exposed systems of cotton and C.I. Reactive Red 3, C.I. Reactive Black 5 and C.I. Direct Blue 78 azo dyes, respectively, generated stable free radicals could be detected. The observed hyperfine splitting of ESR spectra suggest the free radical are formed in the chromophore. Based upon the calculated g-values the location of the generated unpaired electron could be assumed on one of the C atoms of the dye molecule.
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