Abstract
Fluorescence excitation and emission behavior are reported for methylcoronene, 1,2-dimethylcoronene, 2-isopropyl-pyrene, 4-isopropylpyrene, 2,4,7,10-tetraisopropylpyrene, 1,3,6,8-tetraisopropylpyrene, 1,3,5,7,9-pentaisopropylpyrene, 2,7-di- tert-butylpyrene, 2,7-di-(dimethylpropyl)pyrene, 1,3,6,8-tetracyclopentylpyrene and 1,3,6,8-tetracyclohexylpyrene dissolved in various organic solvents of varying solvent polarity. Experimental results are used to test a potential screening method for determining whether a given alkyl-substituted polycyclic aromatic hydrocarbon (PAH) solute is likely to exhibit probe character, as evidenced by a systematic variation in the ratios of the fluorescence intensities of select emission bands with solvent polarity. Of the eleven solutes studied, only 4-isopropylpyrene, methylcoronene and 1,2-dimethylcoronene showed useful solvent polarity probe character. 1,3,6,8-Tetraisopropylpyrene, 1,3,5,7,9-pentaisopropylpyrene, 1,3,6,8-tetracyclohexylpyrene and 1,3,6,8-tetracyclopentylpyrene exhibited slight probe behavior; however, the dynamic ranges covered in emission intensity ratios were believed to be too small for many practical applications when compared against the experimental uncertainty associated with the measured values.
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