Jean-Claude Bunzli - 2,2 '-Bipyrimidine as Efficient Sensitizer of the Solid-State Luminescence of Lanthanide and Uranyl Ions from Visible to Near-Infrared

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  Zucchi,G., Maury,O., Thuery,P., Gumy,F., Bunzli,J.C.G.,   Ephritikhine,M. Chemistry-A European Journal  2009 15 (38) 9686-9696

  Abstract: Treatment of Ln(NO(3))(3)center dot   nH(2)O with 1 or 2 equiv 2,2'-bipyrimidine (BPM) in dry THF   readily afforded the monometallic complexes   [Ln(NO(3))(3)(bpm)(2)] (Ln = Eu, Gd, Dy, Tm) or   [Ln(NO(3))(3)(bpm)(2)]center dot THF (Ln=Eu, Tb, Er, Yb) after   recrystallization from MeOH or THF, respectively. Reactions with   nitrate salts of the larger lanthanide ions (Ln = Ce, Nd. Sm)   yielded one of two distinct monometallic complexes, depending on   the recrystallization solvent: (Ln(NO(3))(3)(bPM)(2)]center dot   THF (Ln=Nd, Sm) from THF, or [Ln(NO(3))(3)(bpm)(MeOH)(2)]center   dot MeOH (Ln=Ce, Nd, Sm) from MeOH. Treatment of   UO(2)(NO(3))(2)center dot 6H(2)O with 1 equiv BPM in THF afforded   the monoadduct [UO(2)(NO(3))(2)(bpm)] after recrystallization   from MeOH. The complexes were characterized by their crystal   structure. Solid-state luminescence measurements on these   nionometallic complexes showed that BPM is ail efficient   sensitizer of the luminescence of both the lanthanide and the   uranyl ions emitting visible light, as well as of the Yb(III) ion   emitting in the near-IR. For Tb, Dv, Eu, and Yb complexes, energy   transfer was quite efficient, resulting in quantum yields of   80.0, 5.1, 70.0, and 0.8%, respectively. All these complexes in   the solid state were stable in air

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