Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2010 Jul 1;2010(21):3343-3347.
doi: 10.1002/ejic.201000309.

Strong Circularly Polarized Luminescence from Highly Emissive Terbium Complexes in Aqueous Solution

Amanda P S Samuel  1 , Jamie L Lunkley, Gilles Muller, Kenneth N Raymond
Affiliations

Strong Circularly Polarized Luminescence from Highly Emissive Terbium Complexes in Aqueous Solution

Amanda P S Samuel et al. Eur J Inorg Chem. .

Abstract

Two luminescent terbium(III) complexes have been prepared from chiral ligands containing 2-hydroxyisophthalamide (IAM) antenna chromophores and their non-polarized and circularly-polarized luminescence properties have been studied. These tetradentate ligands, which form 2:1 ligand/Tb(III) complexes, utilize diaminocyclohexane (cyLI) and diphenylethylenediamine (dpenLI) backbones, which we reasoned would impart conformational rigidity and result in Tb(III) complexes that display both large luminescence quantum yield (Φ) values and strong circularly polarized luminescence (CPL) activities. Both Tb(III) complexes are highly emissive, with Φ values of 0.32 (dpenLI-Tb) and 0.60 (cyLI-Tb). Luminescence lifetime measurements in H(2)O and D(2)O indicate that while cyLI-Tb exists as a single species in solution, dpenLI-Tb exists as two species: a monohydrate complex with one H(2)O molecule directly bound to the Tb(III) ion and a complex with no water molecules in the inner coordination sphere. Both cyLI-Tb and dpenLI-Tb display increased CPL activity compared to previously reported Tb(III) complexes made with chiral IAM ligands. The CPL measurements also provide additional confirmation of the presence of a single emissive species in solution in the case of cyLI-Tb, and multiple emissive species in the case of dpenLI-Tb.

PubMed Disclaimer

Figures

Figure 1
Figure 1
Chemical structures of cyLI- and dpenLI-IAM ligands.
Figure 2
Figure 2
Absorption spectra (2a) and CD spectra (2b) of cyLI-Tb (solid) and dpenLI-Tb (dashed) in aqueous solution [C = 10−5 m, 0.1 m Tris (pH = 7.4)] at 298 K.
Figure 3
Figure 3
Luminescence spectra of cyLI-Tb (solid) and dpenLI-Tb (dashed) in aqueous solution (0.1 m Tris, pH = 7.4) at 298 K normalized to the intensity of the J = 5 peak.
Figure 4
Figure 4
CPL (top) and total luminescence spectra (bottom) for the 5D4→7F5 transition for cyLI-Tb (solid) and dpenLI-Tb (dashed) in aqueous solution.
Scheme 1
Scheme 1
Syntheses of cyLI- and dpenLI-IAM ligands.
See this image and copyright information in PMC

References

    1. Brittain HG. In: Lanthanide Probes in Life, Chemical and Earth Sciences: Theory and Practice. 3rd ed. Bünzli J-CG, Choppin GR, editors. Amsterdam: Elsevier; 1989.
    1. Richardson FS, Riehl JP. Chem. Rev. 1977;77:772–792.
    1. Riehl JP, Richardson FS. Chem. Rev. 1986;86:1–16.
    1. Riehl JP, Richardson FS. Methods Enzymol. 1993;226:539–553. - PubMed
    1. Brittain HG. Appl. Spectrosc. Rev. 2007;35:175–201.