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Doctoral thesis
Open access
English

Investigating photoinduced charge-Transfer products using ultrafast spectroscopy

ContributorsBeckwith, Joseph
DirectorsVauthey, Ericorcid
Defense date2019-10-23
Abstract

Charge-transfer products and their generation are at the heart of a huge amount of chemistry. Here, photoinduced charge-transfer products and charge-transfer reactions were studied. This thesis presents multiple investigations into this area. The radical ion excited states of di-, tri- and tetra-cyanoanthracene, were studied using transient absorption spectroscopy. Quinone derivatives were also investigated using the same technique. Highly exergonic bimolecular charge separation reactions were studied using broadband fluorescence upconversion techniques and, for the first time, fluorescence from radical ion products was observed at early reaction times. A new method to track excited-state symmetry breaking in molecules lacking IR marker modes is presented. An investigation into ion-pair dynamics reveals that the excited-state of the radical anion may be used as a probe into the average distance between it and its corresponding radical counterion. A variety of donor-acceptor complexes have been studied using multiple spectroscopies, with the investigations finding rich excited-state dynamics.

eng
Keywords
  • Ultrafast Spectroscopy
  • Electron Transfer
  • Charge-Transfer
  • Radical Ions
  • Symmetry-Breaking
  • Time-Resolved Fluorescence
  • Transient Absorption
  • Pump-Pump-Probe
Research group
Citation (ISO format)
BECKWITH, Joseph. Investigating photoinduced charge-Transfer products using ultrafast spectroscopy. 2019. doi: 10.13097/archive-ouverte/unige:126387
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Technical informations

Creation10/31/2019 9:41:00 AM
First validation10/31/2019 9:41:00 AM
Update time03/15/2023 6:23:27 PM
Status update03/15/2023 6:23:27 PM
Last indexation01/29/2024 10:03:36 PM
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