Remarkable 980 nm circularly polarized luminescence from dinuclear Yb(iii) helicates with aD₄symmetry

Abstract

To develop the strong near-infrared circularly polarized luminescent (NIR-CPL) emitters, a pair of ytterbium helicates, [Yb2(R-BTHP)4]2‒ and [Yb2(S-BTHP)4]2‒ based on the binaphthol modified bis-β-diketones are synthesized. X-ray crystallography analysis confirms...

Augmentation of NIR Circularly Polarized Luminescence Activity in Shibasaki-Type Lanthanide Complexes Supported by the Spirane Sphenol

“…This implies that any meaningful direct comparisons between systems will require a detailed disclosure of the experimental setup. The comparison of values from other groups, akin to those made in our manuscripts and others, 15,29,35,36 can provide a general trend but must be interpreted with caution. To our knowledge, these data have not been published, and thus, these metrics are not available for comparison.…”

High Quantum Yields from Perfluorinated Binolate Erbium Complexes and Their Circularly Polarized Luminescence

“…When the CPL value is combined with the quantum yield and molar absorptivity, the CPL brightness ( B CPL ) is calculated to be 317 M –1 cm –1 . This is the brightest erbium complex reported to date and that value is reaching those from some of the brightest ytterbium luminescent compounds: ((Binol) 3 YbNa 3 with B CPL = 379 M –1 cm –1 ) and a D 4 -symmetry Yb­(III) helicate ( B CPL = 821 M –1 cm –1 ) . The alternate Ln B CPL (for lanthanides) was calculated to be 23.6 M –1 cm –1 .…”

“…This is the brightest erbium complex reported to date and that value is reaching those from some of the brightest ytterbium luminescent compounds: ((Binol) 3 YbNa 3 with B CPL = 379 M −1 cm −1 ) 4b and a D 4symmetry Yb(III) helicate (B CPL = 821 M −1 cm −1 ). 16 The alternate Ln B CPL (for lanthanides) 4c6 was calculated to be 23.6 M −1 cm −1 . We note that these complexes are stable in a dilute solution with very minimal decomposition (as revealed by 19 F NMR) even after 3 months.…”

Two pairs of chiral YbIII enantiomers presenting distinct NIR luminescence and circularly polarized luminescence performances with giant differences in second-harmonic generation responses

“…29 For example, the | g lum | value of a Tb III complex with transferrin (Tb III : transferrin = 2 : 1) reaches 0.23 at 540 nm, originating from the 5 D 4 → 7 F 5 transition of the Tb III ion. 30,31 Nevertheless, the majority of known Ln III complexes with CPL activities are Eu III , Tb III , Sm III and Dy III species emitting in the visible region, 32–40 while chiral Yb III , Nd III and Er III complexes with NIR-CPL properties are still very scarce, 41–51 implying that the synthesis of chiral Ln III NIR-emitting complexes and the measurement of their NIR-CPL properties are still enormously challenging. 44…”