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Exploring Differences in Lanthanide Excited State Reactivity Using a Simple Example: The Photophysics of La and Ce
Maksim Y Livshits1, Nikki J Wolford1, Jenny K Banh1
1Los Alamos National Laboratory (LANL), P.O. Box 1663, Los Alamos, New Mexico 87545, United States.
Researchers studied lanthanide thenoyltrifluoroacetone (TTA) complexes using spectroscopy. They discovered simultaneous competing charge transfer (CT) and ligand-localized (LL) excited states, offering insights into photochemical separation.
Area of Science:
- Coordination Chemistry
- Photophysics
- Spectroscopy
Background:
- Lanthanide complexes with thenoyltrifluoroacetone (TTA) are crucial in various applications.
- Understanding their excited-state dynamics is key to optimizing their function.
Purpose of the Study:
- To investigate the excited-state nature and reactivity of f0 and f1 lanthanide TTA complexes.
- To elucidate the presence and interplay of different excited states.
Main Methods:
- Steady-state and time-resolved spectroscopic techniques were employed.
- Computational frameworks were utilized to support spectroscopic assignments.
Main Results:
- The study identified simultaneous, competing, non-interacting charge transfer (CT) and ligand-localized (LL) excited states.
- A Jablonski diagram was constructed to detail excited-state reactivity.
- Direct verification of competing excited states was achieved through wavelength and excitation power dependence studies.
Conclusions:
- The findings provide the first direct evidence for simultaneous CT and LL excited states in these lanthanide complexes.
- The photophysical properties correlate with potential photochemical separation mechanisms.
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