Related Experiment Video
Updated: May 5, 2026

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
Published on: January 20, 2022
Isomer differentiation in 7, 12-dimethylbenz[a]anthracene-pyridine adducts by fast atom bombardment tandem mass
G G Dolnikowski1, M L Gross, E L Cavalieri
1Midwest Center for Mass Spectrometry, Department of Chemistry, University of Nebraska-Lincoln, 68588-0304, Lincoln, NE, USA.
Abstract:
Three isomeric 7,12-dL-nethylbenz[α]anthracene-pyridine adduct salts, namely.. the 5-N-pyridinium-7,12-dimethylbenz[α]anthracene perchlorate, the 7-N-pyridiniummethylene-12methylbenz[ α]anthracene picrate, and the 7-methyl-12-N-pyridiniummethylenebenz[ α]anthracene picrate, were studied by fast atom bombardment tandem mass spectrometry using high energy collisional-activated dissociation (CAD). The CAD mass spectra of the molecular cations and the (M - pyridine)(+) ions allow one to distinguish positional isomers on the basis of daughter ion peak height ratios. The differences in the CAD mass spectra of the (M - pyridine)(+) ions are probably due in part to formation of isomer-specific fused-ring tropyliumions.
Related Concept Videos
Mass Spectrometry: Aromatic Compound Fragmentation
NMR Spectroscopy of Benzene Derivatives
Tandem Mass Spectrometry
Mass Spectrometry: Branched Alkane Fragmentation
Mass Spectrometry: Isotope Effect
Mass Spectrometry: Cycloalkene Fragmentation

