Abstract
Fluorescence emission spectra are reported for 3,4,5-trihydrobenzo[cd]pyrene, 3,4-dihydrobenzo[ghi]perylene, 5,6,7,8,9,10-hexahydrobenzo[ghi]perylene, <i>trans</i>-10b,10c-dihydro-10b,10c-dimethylpyrene, <i>trans</i>-12b,12c-dihydro-12b,12c-dimethylbenzo[a]pyrene, and <i>trans</i>-14b,14c-dihydro-14b,14c-dimethylnaphtho[2,1,8-qra]naphthacene dissolved in organic nonelectrolyte solvents of varying polarity. Dihydrobenzo[ghi]perylene was found to exhibit probe character, as evidenced by a systematic variation in emission intensity ratio with solvent polarity. It has a dynamic range of 0.98 and a high fluorescence quantum yield and is thought to be noncarcinogenic. Also reported are mathematical expressions which correlate measured intensity ratios and solvent polarity probe behavior of dihydrobenzo[ghi]perylene, pyrene, benzo[ghi]perylene, coronene, and ovalene in 48 solvents of varying polarity.
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