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Temperature-dependent NIR-CPL spectra of chiral Yb(III) complexes.
- Source :
- Physical Chemistry Chemical Physics (PCCP); 6/7/2024, Vol. 26 Issue 21, p15776-15783, 8p
- Publication Year :
- 2024
-
Abstract
- Chiral, enantiopure Yb(III) complexes exhibit circularly polarized luminescence (CPL) in the near infrared (NIR) wavelength region. This CPL is quantified by the dissymmetry factor (g<subscript>lum</subscript>). The excited state <superscript>2</superscript>F<subscript>5/2</subscript> consists of six m<subscript>J′</subscript> states degenerated in three Stark levels, due to the crystal-field splitting (CFS), which are populated in accordance with the Boltzmann distribution. Consequently, room temperature CPL spectra are the sum of various - either positive or negative – contributions, that are practically impossible to quantify. To address this issue, an advanced setup enabling CPL measurements over a broad temperature range (300 to 4 K) has been developed. The interrelation of CFS, g<subscript>lum</subscript> and temperature was explored using a pair of enantiopure Yb(III) complexes, highlighting the individual contribution of each crystal-field sublevel to the overall CPL spectrum, as anticipated by simulations performed in the framework of multireference wave-functions. Hence, the CPL spectra of chiral lanthanide complexes were found to be indeed strongly temperature-dependent, as is the g<subscript>lum</subscript> dissymmetry factor, as a consequence of the variation in thermal sublevel population. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639076
- Volume :
- 26
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Physical Chemistry Chemical Physics (PCCP)
- Publication Type :
- Academic Journal
- Accession number :
- 177581735
- Full Text :
- https://doi.org/10.1039/d4cp01286k