Efficient Luminescence from Fluorene‐ and Spirobifluorene‐Based Lanthanide Complexes upon Near‐Visible Irradiation |
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| Authors: | Dr. Gregorio Bottaro Dr. Fabio Rizzo Dr. Marco Cavazzini Dr. Lidia Armelao Dr. Silvio Quici |
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| Affiliation: | 1. IENI‐CNR and INSTM, Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova (Italy);2. ISTM‐CNR, Via Golgi 19, 20133 Milano (Italy);3. ISTM‐CNR and Polo Scientifico Tecnologico, Via Fantoli 15/16, 20138 Milano (Italy) |
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| Abstract: | 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 Ln3+ (Gd3+, Eu3+, Sm3+, Tb3+, Dy3+) 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 (?se>0.1) upon sensitization in the near‐visible region, that is, with an excitation wavelength above 350 nm. The luminescence of the Eu3+complexes is clearly detectable at concentrations as low as 10 pM . Furthermore, the structural organization of these bipartite ligands makes the complexes highly soluble in aqueous solutions and chemically stable over time. |
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| Keywords: | antennas fluorenes lanthanides luminescence photophysics |
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