Browsing by Author "Frontiera, Renee R"
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Item Evidence for superoxide-initiated oxidation of aniline in water by pulsed, atmospheric pressure plasma(2024-05-13) Clay, Collin D; Mueller, Chelsea M; Rich, Christopher; Schatz, George C; Bruggeman, Peter; Frontiera, Renee R; rrf@umn.edu; Frontiera, Renee RPlasma-driven solution electrochemistry (PDSE) uses plasma-generated reactive species to drive redox reactions in solution. Non-thermal, atmospheric pressure plasmas, when irradiating water, produce many redox species. While PDSE is a promising chemical tool, there is limited insight into the mechanisms of the reactions due to the variety of short-lived reagents produced. In this study, we use aniline as a model system for studying redox mechanisms of PDSE. We show that the plasma irradiation of aqueous aniline solutions drives the formation of polyaniline oligomer, which is suppressed under acidic starting conditions. The addition of (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO), a radical scavenger, decreases the formation of oligomer by 80%, and the addition of superoxide dismutase fully hinders oligomerization. These results lead us to conclude that the oligomerization of aniline by plasma irradiation is initiated by superoxide. This discovery provides novel insights into PDSE mechanisms and illustrates a potential method of harnessing superoxide for chemical reactions.Item Femtosecond stimulated Raman spectroscopy – guided library mining leads to efficient singlet fission in rubrene derivatives(2021-09-28) Bera, Kajari; Douglas, Christopher J; Frontiera, Renee R; rrf@umn.edu; Frontiera, Renee R; Frontiera labItem The FSRS data of crystalline halogen-substituted rubrene derivatives under different excitation conditions taken in the Frontiera lab at the University of Minnesota in 2022(2024-05-16) Clapham, Margaret L; Das, Aritra; Douglas, Christopher J; Frontiera, Renee R; rrf@umn.edu; Frontiera, Renee R; University of Minnesota Frontiera LabThese are the FSRS data files of crystalline halogen-substituted rubrene derivatives under different excitation conditions, taken in the Frontiera lab at the University of Minnesota in 2022. This data is released to support a publication submitted to the Journal of the American Chemical Society entitled "Killer Phonon Caught: Femtosecond Stimulated Raman Spectroscopy Identifies Phonon-Induced Control of Photophysics in Rubrene Derivatives".