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Efficient Luminescence from Fluorene‐ and Spirobifluorene‐Based Lanthanide Complexes upon Near‐Visible Irradiation
Author(s) -
Bottaro Gregorio,
Rizzo Fabio,
Cavazzini Marco,
Armelao Lidia,
Quici Silvio
Publication year - 2014
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.201305029
Subject(s) - lanthanide , luminescence , europium , photochemistry , aqueous solution , fluorene , antenna effect , chemistry , covalent bond , excitation wavelength , phosphor , materials science , polymer , organic chemistry , wavelength , optoelectronics , ion
We describe herein the synthesis and photophysical characterization of new lanthanide complexes that consist of a (9,9‐dimethylfluoren‐2‐yl)‐2‐oxoethyl or a (9,9′‐spirobifluoren‐2‐yl)‐2‐oxoethyl unit as the antenna, covalently linked to a 1,4,7,10‐tetraazacyclododecane‐1,4,7‐triacetic acid (DO3A) unit as the Ln 3+ (Gd 3+ , Eu 3+ , Sm 3+ , Tb 3+ , Dy 3+ ) coordination site. We were able to translate the spectroscopic properties of the innovative bipartite ligands into the formation of highly luminescent europium complexes that exhibit efficient emission ( ϕ se >0.1) upon sensitization in the near‐visible region, that is, with an excitation wavelength above 350 nm. The luminescence of the Eu 3+ complexes is clearly detectable at concentrations as low as 10 p M . Furthermore, the structural organization of these bipartite ligands makes the complexes highly soluble in aqueous solutions and chemically stable over time.