ISSN:
1436-5073
Keywords:
fluorescence quenching
;
micellar solvent media
;
nitromethane selective quenching rule
;
anionic surfactants
;
cationic surfactants
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Applicability of the nitromethane selective quenching rule for discriminating between alternant versus nonalternant polycyclic aromatic hydrocarbons (PHAs) is examined for 38 representative PAH solutes dissolved in micellar sodium dodecylbenzenesulfonate (SDBS) and in micellar dodecylethyldimethyl-ammonium bromide (DEDAB) solvent media. Experimental results show that nitromethane quenched fluorescence of only the 20 alternant PAHs in the cationic DEDAB surfactant solvent media as expected. Emission intensities of nonalternant PAHs, except for the few borderline cases noted in previous work, were unaffected by nitromethane addition. Unexpected quenching behavior was observed, however, in the case of nonalternant PAHs dissolved in micellar sodium dodecylbenzenesulfonate solvent media. Nitromethane quenched fluorescence emission of all 18 nonalternant PAHs studied in the SDBS solvent media, which is contrary to the selective quenching rule.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01246847
