Excited State Properties of Lanthanide(III) Complexes with a Nonadentate Bispidine Ligand. Issue 40 (2nd May 2021)

• Record Type: Journal Article
• Authors: Abad‐Galán, Laura; Cieslik, Patrick; Comba, Peter; Gast, Michael; Maury, Olivier; Neupert, Lucca; Roux, Amandine; Wadepohl, Hubert
• Is Part Of: Chemistry. Volume 27:Issue 40(2021)
• Page Start: 10303
• Page End: 10312
• Publication Date: 2021-05-02
• Subjects: Lanthanides -- Luminescence -- Nonadentate ligand -- Photophysics; Quantum Yield; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202005459
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Eu III, Tb III, Gd III and Yb III complexes of the nonadentate bispidine derivative L 2 (bispidine=3, 7‐diazabicyclo[3.3.1]nonane) were successfully synthesized and their emission properties studied. The X‐ray crystallography reveals full encapsulation by the nonadentate ligand L 2 that enforces to all Ln III 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 ([Eu III L 2 ] +, H2 O, 298 K, τ=1.51 ms, ϕ=0.35; [Tb III L 2 ] +, H2 O, 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. Abstract : Eu III, Tb III, Gd III and Yb III complexes of a nonadentate bispidine derivative were successfully synthesized and their emission properties studied. The X‐ray crystallography reveals full encapsulation by the nonadentate ligand, and the identical emission spectra in the 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, making these complexes a possible basis for interesting biological probes.