| An investigation of fluorescence from polycyclic aromatic hydrocarbons (PAHs) in concentrated sulfuric acid (CSA) and trifluoromethanesulfonic acid with the focus of identifying emissive species responsible for anomalous emission in the 550-620nm range from perylene in hexane excited with a femtosecond laser at 535 MD.(16) We present evidence supporting the assignment of several fluorescent species of perylene, anthracene and pyrene as we follow the fate of the emissive protonated cation in an acidic environment. A temporal excitation emission matrix (EEM) investigation of the emissive species and their assignment closely supports a proposed three-step mechanism for the transformation of PAHs to its radical cation in CSA, by Gold and Tye (28) and Carrington et al.(29). |
