POLYCYCLIC AROMATIC HYDROCARBON SOLUTE PROBES .9. EVALUATION OF ADDITIONAL PENTAPHENE, PENTACENE, AND PYRANTHRENE COMPOUNDS AS POSSIBLE SOLVENT POLARITY PROBES

Fluorescence emission spectra are reported for benzo[rst]dinaphtho[2,1,8,7defg;2',1',8',7'ijkl]pentaphene, dibenzo[a,rst]naphtho[8,1,2cde]pentaphene, dibenzo[fg,ij]pentaphene (also called dibenzo[b,n]perylene), dibenzo[de,kl]naphtho[1,2,3,4rst]pentaphene, dibenzo[h,rst]pentaphene, pyranthrene, tetrabenzo[de,hi,op,st]pentacene, and dinaphtho[2,1,8,7de dissolved in various organic solvents. Results of these measurements are used to screen PAHs for potential solvent polarity behavior. Of the eight PAHs examined, only dibenzo[h,rst]pentaphene exhibited probe behavior as evidenced by selective, systematic emission intensity enhancement of band I with increasing solvent polarity.