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Polyanionic Polydentate Europium Complexes as Ultrabright One‐ or Two‐photon Bioprobes
Author(s) -
Sund Henri,
Liao YuanYuan,
Andraud Chantal,
Duperray Alain,
Grichine Alexei,
Le Guennic Boris,
Riobé François,
Takalo Harri,
Maury Olivier
Publication year - 2018
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201800557
Subject(s) - europium , lanthanide , denticity , ligand (biochemistry) , brightness , materials science , chemistry , photon , ion , photochemistry , crystallography , optics , crystal structure , physics , organic chemistry , biochemistry , receptor
A family of europium (III) complexes based on a polydentate ligand functionalized by charge‐transfer antennae presents remarkable one‐ and two‐photon photophysical proper‐ties in water or buffer. A detailed analysis of their emission properties suggests that the wrapping of the ligand around the central rare‐earth ion results in an overall Cs symmetry in agreement with the theoretical simulation and that about 65–70 % of the emission intensity is concentrated in the hypersensitive 5 D 0 → 7 F 2 transition at 615 nm. Their brightness is excellent, in the range of the best lanthanide bioprobes making them very attractive for bio‐imaging experiments.