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Ion-Molecule Reactions of Halocarbon Cations with Polycyclic Aromatic Hydrocarbons in a Quadrupole Ion TrapPart I—Differentiation of Structural Isomers
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1997
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HalogenationChemical EngineeringEngineeringBiochemistryNatural SciencesChemical DerivativeHalocarbon CationsPah IsomersOrganic ChemistryStructural IsomersChemistryHeterocycle ChemistryIon-molecule ReactionsMolecular ChemistryPolycyclic Aromatic HydrocarbonDifferent Pah Isomers
Ion–molecule reactions between polycyclic aromatic hydrocarbons (PAHs) and ions (R+) generated from halogenated hydrocarbons (dichloromethane, chloroform, carbon tetrachloride, 1,1-dichloroethane, difluoromethane and 1,1-difluoroethane) in a quadrupole ion trap were used to differentiate a series of structural isomers of PAHs. This differentiation was based on the formation of [M+R]+ and [M+R-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-HX]+, while the haloethanes also yielded significant amounts of the [M+R]+ adducts. Differences in the ionization energies of the PAH isomers seem to be partially responsible for this differentiation process. Collision-induced dissociation experiments also revealed structural differences in the adducts of different PAH isomers. © 1997 by John Wiley & Sons, Ltd.