Gas-Phase Ion Chemistry of Metalloporphyrin Anions with Molecular Oxygen: Probing the Influence of the Oxidation and Spin State of the Central Transition Metal by Experiment and TheoryClick to copy article linkArticle link copied!
- Tatjana ArchipovTatjana ArchipovInstitut für Physikalische Chemie and Institut für Nanotechnologie, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76128 Karlsruhe, GermanyMore by Tatjana Archipov
- Justin K. KirklandJustin K. KirklandDepartment of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United StatesMore by Justin K. Kirkland
- Konstantinos D. VogiatzisKonstantinos D. VogiatzisInstitut für Physikalische Chemie and Institut für Nanotechnologie, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76128 Karlsruhe, GermanyDepartment of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United StatesMore by Konstantinos D. Vogiatzis
- Annika SteinerAnnika SteinerFachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, GermanyMore by Annika Steiner
- Gereon Niedner-SchatteburgGereon Niedner-SchatteburgFachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, GermanyMore by Gereon Niedner-Schatteburg
- Patrick WeisPatrick WeisInstitut für Physikalische Chemie and Institut für Nanotechnologie, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76128 Karlsruhe, GermanyMore by Patrick Weis
- Karin FinkKarin FinkInstitut für Physikalische Chemie and Institut für Nanotechnologie, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76128 Karlsruhe, GermanyMore by Karin Fink
- Oliver HampeOliver HampeInstitut für Physikalische Chemie and Institut für Nanotechnologie, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76128 Karlsruhe, GermanyMore by Oliver Hampe
- Manfred M. Kappes*Manfred M. Kappes*E-mail: [email protected]Institut für Physikalische Chemie and Institut für Nanotechnologie, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76128 Karlsruhe, GermanyMore by Manfred M. Kappes
Abstract
We performed a comprehensive gas-phase experimental and quantum-chemical study of the binding properties of molecular oxygen to iron and manganese porphyrin anions. Temperature-dependent ion–molecule reaction kinetics as probed in a Fourier-transform ion-cyclotron resonance mass spectrometer reveal that molecular oxygen is bound by, respectively, 40.8 ± 1.4 and 67.4 ± 2.2 kJ mol–1 to the FeII or MnII centers of isolated tetra(4-sulfonatophenyl)metalloporphyrin tetraanions. In contrast, FeIII and MnIII trianion homologues were found to be much less reactive—indicating an upper bound to their dioxygen binding energies of 34 kJ mol–1. We modeled the corresponding O2 adsorbates at the density functional theory and CASPT2 levels. These quantum-chemical calculations verified the stronger O2 binding on the FeII or MnII centers and suggested that O2 binds as a superoxide anion.
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