Ion-Molecule Reactions of Halocarbon Cations with Polycyclic Aromatic Hydrocarbons in a Quadrupole Ion TrapPart I—Differentiation of Structural Isomers

✍ Scribed by Mosi, Andrew A.; Cullen, William R.; Eigendorf, Guenter K.

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 453 KB
• Volume: 32
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/(sici)1096-9888(199708)32:8<864::aid-jms545>3.0.co;2-i

✦ Synopsis

Ion-molecule reactions between polycyclic aromatic hydrocarbons (PAHs) and ions (R') generated from halogenated hydrocarbons (dichloromethane, chloroform, carbon tetrachloride, 1,1-dichloroethane, diÑuoromethane and 1,1-diÑuoroethane) in a quadrupole ion trap were used to di †erentiate a series of structural isomers of PAHs. This di †erentiation was based on the formation of [ M + R ] ' and [ M + R Ô HX ] ' products (X = Cl, F) between the halocarbon ions (R') and PAH molecules (M). Halomethanes were found to give rise predominantly to the elimination products [ M + R Ô HX ] ', while the haloethanes also yielded signiÐcant amounts of the [ M + R ] ' adducts. Di †erences in the ionization energies of the PAH isomers seem to be partially responsible for this di †erentiation process. Collision-induced dissociation experiments also revealed structural di †erences in the adducts of di †erent PAH isomers.