SYNTHESIS AND SPECTROSCOPY OF PAH DIMERS

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https://hdl.handle.net/2142/107690

Title: SYNTHESIS AND SPECTROSCOPY OF PAH DIMERS
Author(s): Webster, Ian
Contributor(s): Duncan, Michael A
Issue Date: 24-Jun-20
Keyword(s): Spectroscopy as an analytical tool
Abstract: Laser desorption time-of-flight mass spectrometry (LD-ToF-MS) experiments on pressed-pellet samples of polycyclic aromatic hydrocarbons (PAHs) exhibit the formation of covalently-bonded dimers at masses (m/z) of 2M-2 and 2M-4 (where M is the parent mass). Through replication of these LD-ToF-MS conditions at higher throughput, PAH dimers have been produced and collected in milligram quantities. For collected samples of pyrene, perylene, and coronene, differential sublimation has isolated the dimer sample from residual monomers. After confirmation of the purification using LD-ToF-MS, the samples are analyzed using a variety of spectroscopic methods, including UV-Vis, IR, and Raman spectroscopy. Theoretical calculations of dimer samples have been done using density functional theory with the CAM-B3LYP method at the def2TZV level of theory. Theory calculations were calibrated and checked by comparison with the monomer samples, and used to determine the lowest energy dimer structures. The simulated spectra were compared with collected spectra of isolated dimers to determine the actual structures of the dimerized PAHs.
Publisher: International Symposium on Molecular Spectroscopy
Type of Resource: Text
Language: English
Permalink: http://hdl.handle.net/2142/107690