Formation of Mono- and Polynuclear Luminescent Lanthanide Complexes based on the Coordination of Preorganized Phosphonated Pyridines.
Fiche publication
Date publication
mai 2018
Journal
Inorganic chemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Dr CHARBONNIERE Loïc, Dr CIANFERANI Sarah
Tous les auteurs :
Salaam J, Tabti L, Bahamyirou S, Lecointre A, Hernandez Alba O, Jeannin O, Camerel F, Cianférani S, Bentouhami E, Nonat AM, Charbonnière LJ
Lien Pubmed
Résumé
A series of polynuclear assemblies based on ligand L (1,4,7-tris[hydrogen (6-methylpyridin-2-yl)phosphonate]-1,4,7-triazacyclononane) has been developed. The coordination properties of ligand L with Ln (Ln = La, Eu, Tb, Yb, Lu) have been studied in water (pH = 7.0) and in DO (pD = 7.0) by UV-absorption spectrometry, spectrofluorimetry, H and P NMR, DOSY, ESI-mass spectrometry, and X-ray diffraction. This nonadentate ligand forms highly stable mononuclear complexes in water and provides a very efficient shielding of the Ln cations, as emphasized by the very good luminescence properties of the Yb complex in DO, especially regarding its lifetime (τ = 10.2 μs) and quantum yield (ϕ = 0.42%). In the presence of excess Ln cation, polynuclar complexes of [(LnL)Ln ] stoichiometry (x = 1 and x = 2) are observed in solution. In the solid state, a dinuclear complex of La could be isolated and structurally characterized by X-ray diffraction, unraveling the presence of strong hydrogen bonding interactions between a La(HO) cation and the [LaL] complex.
Référence
Inorg Chem. 2018 May 10;: