Jean-Claude Bunzli - Fluorinated beta-diketones for the extraction of lanthanide ions: Photophysical properties and hydration numbers of their Eu-III complexes

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  Chauvin,A.S., Gumy,F., Matsubayashi,I., Hasegawa,Y.,   Bunzli,J.C.G. European Journal of Inorganic Chemistry  2006 (2) 473-480

  Abstract: Tris(beta-diketonato) europium (III)   with a series of variably fluorinated ligands derived from   3,5-heptanedione were synthesised with the aim of determining   their hydration state under extraction conditions. The number of   coordinated water molecules was determined by measuring the   lifetime of the Eu(D-5(0)) excited level in water and deuterated   water, The hydration gain (Delta q = q - q(0)) after shaking   chloroform solutions during 10 min with 0.1 M NaClO4 aqueous   solutions depends on the fluorination extent of the diketonates:   fluorination of one methyl group leads to a decrease in Delta q   of ca. 0.5 unit, while fluorination of one ethyl group results in   a decrease of ca. 1.3 units. Highly fluorinated complexes (i.e   with hexafluoroacetylacetonate and related ligands) display a   hydration number close to one while poorly fluorinated compounds   (or nonfluorinated ones, such as the acetylacetonate complex)   have a hydration state close to two. Photophysical properties of   the Eu-III beta-diketonates are also described and the synthesis   of the fluorinated beta-diketones is re-investigated and   discussed in details. ((c) Wiley-VCH Verlag GmbH & Co. KGaA,   69451 Weinheim, Germany, 2006)

  Address (URL): J INORG CHEM