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Eu(III) Luminescence in an Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

Abstract : The spectroscopic characteristics (excitation, emission and lifetime) of Eu(III) dissolved in 1-methyl-3-butylimidazolium bistrifluoromethanesulfonimide (BumimTf 2 N) are reported. In a first series of experiments, the effect of the presence of water in BumimTf 2 N is examined. It appears that non-degassed solutions are most probably inhomogeneous, displaying large water clusters leading to an intense diffusion of the red light of a He:Ne laser. In these samples, the Eu emission spectrum is close to the one observed in slightly acidic aqueous solutions. When the samples are degassed, by contrast, the solution appears homogeneous and water is to be considered as a competitive ligand for the first coordination sphere of Eu. In a subsequent series of experiments, tetrabutylammonium chloride (TBACl) is added to the solution and the resulting species investigated. The ensuing enhancement in the metal-centred luminescence is interpreted in terms of changes in the inner-coordination sphere of the Eu(III) ion and possible structures are discussed.
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Submitted on : Tuesday, August 27, 2019 - 6:51:19 PM
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Isabelle Billard, Soufiane Mekki, Clotilde Gaillard, Peter Hesemann, Gilles Moutiers, et al.. Eu(III) Luminescence in an Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2004, 2004 (6), pp.1190-1197. ⟨hal-02272559⟩

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