Jean-Claude Bunzli - Synthetic, Structural, and Spectroscopic Studies on Solids Containing Tris(Dipicolinato) Rare-Earth Anions and Transition Or Main-Group Metal-Cations

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      Publication Details (including relevant citation   information):

      Brayshaw,P.A., Bunzli,J.C.G., Froidevaux,P., Harrowfield,J.M.,   Kim,Y., Sobolev,A.N. Inorganic Chemistry  1995 34 (8) 2068-2076

      Abstract: The synthesis and basic   characterisation are reported for 85 new solids of the general   formula [ML(x)][Ln-(dipic)(3)] . nH(2)O (M = Cr or Co; L = urea,   ammonia, and various amines; Ln = La-Lu, plus Y; dipic =   pyridine-2,6-dicarboxylate). Syntheses of some seven   Cs-3[Ln(dipic)(3)] and [N(C2H5)(4)](3)[Ln(dipic)(3)] species are   also given. Low-temperature luminescence measurements on a   variety of these compounds and full X-ray crystallographic   structure determinations for Cs-3[Eu(dipic)(3)]. 9H(2)O   (orthorhombic, space group C222(1); a = 10.165(2), b = 18.164(4),   c = 18.724(4) Angstrom; Z = 4; R(1) = 0.041 for 1573 ''observed''   reflections) and [Co(sar)]p[Eu(dipic)(3)]. 13H(2)O (monoclinic,   space group P2(1)/n; n = 10.611(4), b = 26.500(10), c = 17.583(7)   Angstrom; beta = 91.97(3)degrees; Z = 4; R(1) = 0.037 for 7695   ''observed'' reflections) are described to illustrate the range   and complexity of the physical properties of these new materials.   Both Cr(IlI) and Co(III) act as very efficient quenchers of the   normally strong [Eu/Tb(dipic)(3)](3-) luminescence, though in at   least one system it appears that Cr(III) may act to transfer   excitation energy to Ln excited states from its own higher levels   while simultaneously deactivating the Ln ion through its lower   (doublet) states

      Address (URL): WOS:A1995QT60300019