The absorption spectrum of the 2-chlorophenoxyl radical is compared with those of its isomer radicals, with those of the bromo- and methylphenoxyl radicals, and also with that of the phenoxyl itself. Spectra of the monosubstituted phenoxyls are very similar. Substitution on the phenoxyl radical in 4-position causes a significant enhancement in the extinction coefficient. 2-substitution causes a little blue-shift of the spectrum, the 3- and 4-substitutions, however, more significant red-shifts.
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