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 Title: CHARACTERIZATION OF PHOTOINDUCED VALENCE TAUTOMERISM IN A COBALT DIOXOLENE COMPLEX BY FEMTOSECOND M-EDGE SPECTROSCOPY Author(s): Ash, Ryan T Contributor(s): Vura-Weis, Josh ; Zhang, Kaili Subject(s): Mini-symposium: High-Harmonic Generation and XUV Spectroscopy Abstract: Cobalt dioxolene complexes undergoing photoinduced valence tautomerism (VT) are potential candidates for molecular electronic devices. Thermal or photoinduced electron transfer between a dioxolene ligand and the metal center reversibly switch the complex between a paramagnetic or diamagnetic species. A low-spin Co$^{II}$ intermediate is believed to be involved in the photogeneration of the paramagnetic state from the diamagnetic state, but has not been spectroscopically observed yet. Our group has developed a tabletop M-edge XANES spectrometer which generates femtosecond extreme ultraviolet pulses via high-harmonic generation (HHG). M-edge spectroscopy has been shown to be sensitive to changes in oxidation state, spin state and/or ligand field changes at metal centers, and the spectra can be predicted using ligand field multiplet theory. In this work, we will present temperature dependent and time-resolved spectra of a cobalt dioxolene VT compound and highlight the ultrafast electron transfer and spin state changes. The theoretical tools developed to predict and interpret the M-edge spectra of metal-centered excited states will also be discussed. This work demonstrates that HHG-based XUV absorption spectroscopy is an accessible alternative to synchrotron-based X-ray absorption spectroscopy for elucidating the electronic structure and photoinduced dynamics of transition metal complexes. Issue Date: 2019-06-19 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/104279 DOI: 10.15278/isms.2019.WE02 Rights Information: Copyright 2019 Ryan T Ash Date Available in IDEALS: 2019-07-152020-01-25
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