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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Simultaneous detection of two triplets: a time-resolved resonance Raman study
Rishikesh Pandey1, Siva Umapathy
1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
The Journal of Physical Chemistry. A
|July 19, 2012
Summary
Solvent effects on thioxanthone
Area of Science:
- Photochemistry
- Spectroscopy
- Computational Chemistry
Background:
- Solvents significantly influence molecular excited states.
- Understanding solvent effects on triplet states is crucial for reactivity studies.
Purpose of the Study:
- Investigate solvent-induced structural modifications in thioxanthone's lowest excited triplet state.
- Explore the coexistence of multiple triplet states in solution.
Main Methods:
- Employed time-resolved resonance Raman (TR3) spectroscopy.
- Utilized Density Functional Theory (DFT) with Self-Consistent Reaction Field (SCRF) for vibrational frequency calculations.
- Conducted probe wavelength-dependent Raman and photoreduction experiments at various temperatures.
Main Results:
- Observed a unique coexistence of two distinct triplet states in thioxanthone.
- Spectroscopic and photochemical data confirmed the presence of these coexisting triplets.
- Demonstrated solvent-induced subtle structural changes impacting triplet state dynamics.
Conclusions:
- The study provides evidence for the coexistence of two triplet states in thioxanthone.
- Solvent interactions play a critical role in modulating triplet state structure and reactivity.
- TR3 spectroscopy is a powerful tool for elucidating excited-state dynamics in solution.
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