Dissociation of the Anthracene Radical Cation: A Comparative Look at iPEPICO and Collision-Induced Dissociation Mass Spectrometry Results

Dissociation of the Anthracene Radical Cation: A Comparative Look at iPEPICO and Collision-Induced Dissociation Mass Spectrometry Results

The dissociation of the anthracene radical cation has been studied using two different methods: imaging photoelectron photoion coincidence spectrometry (iPEPCO) and atmospheric pressure chemical ionization–collision induced dissociation mass spectrometry (APCI-CID). Four reactions were investigated:...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 118; no. 42; pp. 9870 - 9878
Main Authors: West, Brandi, Sit, Alicia, Mohamed, Sabria, Joblin, Christine, Blanchet, Valerie, Bodi, Andras, Mayer, Paul M
Format: Journal Article
Language:English
Published: United States American Chemical Society 23-10-2014
Subjects:
Anthracene
Atomic and Molecular Clusters
Cations
Fittings
Fragmentation
Imaging
Mass spectrometry
Physics
Radicals
Spectroscopy
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Summary:The dissociation of the anthracene radical cation has been studied using two different methods: imaging photoelectron photoion coincidence spectrometry (iPEPCO) and atmospheric pressure chemical ionization–collision induced dissociation mass spectrometry (APCI-CID). Four reactions were investigated: (R1) C14H10 +• → C14H9 + + H, (R2) C14H9 + → C14H8 +• + H, (R3) C14H10 +• → C12H8 +• + C2H2 and (R4) C14H10 +• → C10H8 +• + C4H2. An attempt was made to assign structures to each fragment ion, and although there is still room for debate whether for the C12H8 +• fragment ion is a cyclobuta[b]naphthalene or a biphenylene cation, our modeling results and calculations appear to suggest the more likely structure is cyclobuta[b]naphthalene. The results from the iPEPICO fitting of the dissociation of ionized anthracene are E 0 = 4.28 ± 0.30 eV (R1), 2.71 ± 0.20 eV (R2), and 4.20 ± 0.30 eV (average of reaction R3) whereas the Δ‡ S values (in J K–1 mol–1) are 12 ± 15 (R1), 0 ± 15 (R2), and either 7 ± 10 (using cyclobuta[b]naphthalene ion fragment in reaction R3) or 22 ± 10 (using the biphenylene ion fragment in reaction R3). Modeling of the APCI-CID breakdown diagrams required an estimate of the postcollision internal energy distribution, which was arbitrarily assumed to correspond to a Boltzmann distribution in this study. One goal of this work was to determine if this assumption yields satisfactory energetics in agreement with the more constrained and theoretically vetted iPEPICO results. In the end, it did, with the APCI-CID results being similar.
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ISSN:1089-5639
1520-5215
DOI:10.1021/jp505438f