POLYCYCLIC AROMATIC HYDROCARBON SOLUTE PROBES .10. EVALUATION OF SELECT HYDROGENATED PYRENE, BENZO[GHI]PERYLENE, AND NAPHTHALENE DERIVATIVES AS POSSIBLE SOLVENT POLARITY PROBES

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, trans-10b,10c-dihydro-10b,10c-dimethylpyrene, ns-12b,12c-di hydro-12b,12c-dimethylbenzo[a]pyrene, and ydro-14b,14c-dimethylnaphtho [2,1,8-qra]naphthacene dissolved in organic nonelectrolyte solvents of varying polarity. Dihydrobenzo[ghi]perylene was found to exhibit prob e character, as evidenced by a systematic variation in emission intens ity 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 in tensity ratios and solvent polarity probe behavior of dihydrobenzo[ghi ]perylene, pyrene, benzo[ghi]perylene, coronene, and ovalene in 48 sol vents of varying polarity.