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Superior Circularly Polarized Luminescence Brightness Achieved with Chiral Heteroleptic Nine-Coordinate Coumarin-Based Tb3+Complexes
- Source :
- Inorganic Chemistry; 20240101, Issue: Preprints
- Publication Year :
- 2024
-
Abstract
- In order to facilitate the practical application of circularly polarized luminescence (CPL) active molecules, the CPL brightness (BCPL) must be optimized. We have applied a binary modular strategy to synthesize two chiral organo-Tb3+complexes, [Tb(Coum)3(1R,2R-Ph-PyBox)] (2) and [Tb(Coum)3(1S,2S-Ph-PyBox)] (5), combining 3-acetyl-4-hydroxy-coumarin (Coum) and enantiopure 2,6-bis(4-phenyl-2-oxazolin-2-yl) pyridine (1R,2R/1S,2S-Ph-PyBox). The photophysical properties of these novel complexes have been fully characterized. The combined point-chiral induction capability of chiral bis(oxazoline) derivatives and the outstanding photophysical properties of the coumarin-derived ligand have resulted in an intense excited-state chiroptical activity (|glum| = 0.097–0.103) for both Tb3+enantiomers, with a bright Tb3+-centered high-purity green emission (ΦPL= 74%) and enhanced antenna-centered absorption behavior (ε320 nm= 47820–47940 M–1cm–1). A superior BCPL(1132.7–1205.8 M–1cm–1at 5D4→ 7F5) has been established for complexes 2and 5. The strategy adopted in this work provides a new route to chiroptical organo-Tb3+luminophores with outstanding comprehensive performance.
Details
- Language :
- English
- ISSN :
- 00201669 and 1520510X
- Issue :
- Preprints
- Database :
- Supplemental Index
- Journal :
- Inorganic Chemistry
- Publication Type :
- Periodical
- Accession number :
- ejs67382110
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.4c02007