Excited State Properties of Lanthanide(III) Complexes with a Nonadentate Bispidine Ligand |
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Authors: | Dr Laura Abad-Galán Dr Patrick Cieslik Prof Dr Peter Comba Dr Michael Gast Dr Olivier Maury Lucca Neupert Dr Amandine Roux Prof Dr Hubert Wadepohl |
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Institution: | 1. Université de Lyon, ENS de Lyon, Laboratoire de Chimie, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France;2. Universität Heidelberg, Anorganisch-Chemisches Institut, INF 270, 69120 Heidelberg, Germany |
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Abstract: | EuIII, TbIII, GdIII and YbIII complexes of the nonadentate bispidine derivative L2 (bispidine=3,7-diazabicyclo3.3.1]nonane) were successfully synthesized and their emission properties studied. The X-ray crystallography reveals full encapsulation by the nonadentate ligand L2 that enforces to all LnIII cations a common highly symmetrical capped square antiprismatic (CSAPR) coordination geometry (pseudo C4v symmetry). The well-resolved identical emission spectra in solid state and in solution confirm equal structures in both media. As therefore expected, this results in long-lived excited states and high emission quantum yields (EuIIIL2]+, H2O, 298 K, τ=1.51 ms, ϕ=0.35; TbIIIL2]+, H2O, 298 K, τ=1.95 ms, ϕ=0.68). Together with the very high kinetic and thermodynamic stabilities, these complexes are a possible basis for interesting biological probes. |
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Keywords: | Lanthanides Luminescence Nonadentate ligand Photophysics Quantum Yield |
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