Improved Energy Transfer in the Sensitization of Americium Enables Observation of Circularly Polarized Luminescence.

Autor: Woods JJ; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States., Wacker JN; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States., Peterson A; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States., Abergel RJ; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.; Department of Nuclear Engineering and Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, United States., Ung G; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.; Department of Chemistry, University of Connecticut, Storrs, CT 06269, United States.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Aug 30, pp. e202412535. Date of Electronic Publication: 2024 Aug 30.
DOI: 10.1002/anie.202412535
Abstrakt: The first example of circularly polarized luminescence (CPL) from a molecular americium (Am) complex is reported. Coordination of Am(III) by a combination of thenoyltrifluoroacetonate and a chiral diphosphine oxide ligand yielded a complex with strong sensitized metal-centered luminescence. The energy transfer process for sensitization appears to occur via a unique resonant pathway, which results in the removal of the overlap between ligand phosphorescence and sensitized Am luminescence that has often been observed. Owing to this feature, and despite the limited amount of material that could be used due to the radioactivity of 241 Am, CPL could be measured. The collected luminescence and CPL spectra provide insight into the crystal field splitting of the 5 D 1 → 7 F 1 transition. These results pave the way for future studies of Am(III) luminescence to investigate electronic structure effects in this and other 5 f elements.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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