In Situ Resonant UV-Raman Spectroscopy of Polycyclic Aromatic Hydrocarbons

2015 ◽  
Vol 119 (21) ◽  
pp. 11694-11698 ◽  
Author(s):  
Matteo Signorile ◽  
Francesca Bonino ◽  
Alessandro Damin ◽  
Silvia Bordiga
Keyword(s):  
Raman Spectroscopy ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Uv Raman Spectroscopy ◽  
Polycyclic Aromatic ◽  
Uv Raman

UV Raman Spectroscopy of Oilsands-Derived Bitumen and Commercial Petroleum Products

2002 ◽  
Vol 56 (10) ◽  
pp. 1308-1313 ◽  
Author(s):  
L. C. T. Shoute ◽  
K. J. Schmidt ◽  
R. H. Hall ◽  
M. A. Webb ◽  
S. Rifai ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Aromatic Hydrocarbons ◽  
Resonance Raman Spectroscopy ◽  
Petroleum Products ◽  
Excitation Wavelength ◽  
Ultraviolet Excitation ◽  
Uv Raman Spectroscopy ◽  
Commercial Gasoline ◽  
Polycyclic Aromatic ◽  
Uv Raman

Raman and resonance Raman spectroscopy with ultraviolet excitation were performed on several sample types of oilsands-derived bitumen, highly heterogeneous mixtures of hydrocarbons, and commercial gasoline samples. Only excitation wavelengths below ∼240 nm successfully yielded fluorescence-free Raman spectra on all of the samples tested. The spectra were surprisingly simple in the 800–1800 cm−1 region, with most of the samples yielding spectra containing only 2 bands. The results presented here tentatively suggest that ultraviolet (UV) Raman spectroscopy in the “fingerprint” spectral regions will be useful for the qualitative identification of saturate, mono-, bi-, tri-, and polycyclic aromatic hydrocarbons. Tentative marker bands for total aromatic, saturate, mono-, and bicyclic (or higher) aromatic hydrocarbons are clearly observed at ∼1600, <900, 1036, and ∼1380 cm−1, respectively. Observed relative intensities vary with the excitation wavelength from 220 to 234 nm, suggesting that some selectivity is achievable by wavelength tuning. Preliminary investigations of commercial gasoline samples indicate that UV Raman spectroscopy can be used for refinery/vendor identification of unknown gasoline samples.

scholarly journals Multi-Stage Redox Systems Based on Dicationic P-Containing Polycyclic Aromatic Hydrocarbons

2019 ◽  
Author(s):  
Thomas Delouche ◽  
Antoine Vacher ◽  
Elsa Caytan ◽  
Thierry Roisnel ◽  
Boris Le Guennic ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Organic Radical ◽  
Electrochemical Studies ◽  
Redox Systems ◽  
Redox States ◽  
Multi Stage ◽  
Polycyclic Aromatic ◽  
The Impact

In this communication, we report the straightforward<br>synthesis of unprecedented electron-acceptors based on dicationic P-containing PAHs (Polycyclic Aromatic Hydrocarbons) where two phosphoniums are connected through various PAHs backbones. The impact of pi-extension on both the optical and redox properties is investigated using a joint experimental/theoretical approach.<br>Finally, (spectro)-electrochemical studies prove that these<br>compounds possess three redox states and EPR studies confirms the in situ formation of an organic radical.

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