Premium
Excited State Properties of Lanthanide(III) Complexes with a Nonadentate Bispidine Ligand
Author(s) -
AbadGalán Laura,
Cieslik Patrick,
Comba Peter,
Gast Michael,
Maury Olivier,
Neupert Lucca,
Roux Amandine,
Wadepohl Hubert
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005459
Subject(s) - excited state , lanthanide , nonane , chemistry , ligand (biochemistry) , solid state , kinetic energy , crystallography , emission spectrum , spectral line , atomic physics , stereochemistry , ion , physics , quantum mechanics , organic chemistry , biochemistry , receptor
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 C 4v 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 ] + , H 2 O, 298 K, τ=1.51 ms, ϕ=0.35; [Tb III L 2 ] + , H 2 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.