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The substituents at positions 2, 6 and 8 in the commercial dye PM567 have been changed and their influence on the triplet state of each dye has been studied in terms of the absorption spectra, lifetimes, quantum yields and triplet–triplet extinction coefficients. The dyes have in position 8 the groups p-acetoxypolymethylene, p-(acetoxypropyl)phenyl or p-(acetoxymethyl)polyphenylene, or in positions...
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