Jean-Claude Bunzli - Eu-III luminescence in a hygroscopic ionic liquid: Effect of water and evidence for a complexation process

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      Billard,I., Mekki,S., Gaillard,C., Hesemann,P., Moutiers,G.,   Mariet,C., Labet,A., Bunzli,J.C.G. European Journal of   Inorganic Chemistry 2004 (6) 1190-1197

      Abstract: The spectroscopic characteristics   (excitation, emission and lifetime) of Eu-III dissolved in   1-methyl-3-butyhmidazolium bis(trifluoromethanesulfon)imide   (BumimTf(2)N) are reported. In a first series of experiments, the   effect of the presence of water in BumimTf(2)N was 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 an He:Ne laser. In these   samples, the Eu emission spectrum is close to that observed in   slightly acidic aqueous solutions. In contrast, when the samples   were de-gassed the solution appeared homogeneous and water can be   considered as a competitive ligand for the first coordination   sphere of Eu. In a subsequent series of experiments,   tetrabutylammonium chloride (TBACl) was added to the solution and   the resultant species investigated. The ensuing enhancement in   the metal-centered luminescence has been interpreted in terms of   changes in the inner coordination sphere of the Eu-III ion and   possible structures are discussed. (C) Wiley-VCH Verlag GmbH   & Co. KGaA, 69451 Weinheim, Germany, 2004

      Address (URL): J INORG CHEM