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Abstract: The two dinuclear rare earth complexes Eu2(PBa)6(Phen)2 and Tb2(PBa)6(Phen)2, (where PBa=4-pentylbenzoate group and Phen=1, 10-phenanthroline), were synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffraction. Both of them crystallize in space group P-1 with similar cell parameters. Each Eu or Tb ion is nine-coordinated with one 1, 10-phenanthroline molecule, one bidentate chelating carboxylate group, two bidentate bridging carboxylate groups, and two tridentate bridging carboxylate groups. The fluorescent properties of the europium and terbium complexes were also investigated. Under the UV excitation, the two complexes exhibit extensive characteristic emissions of europium and terbium ions, respectively. [Copyright &y& Elsevier]

Abstract: The OA-modified CaF2: Eu nanocrystals that can be well dispersed in chloroform to form a clear solution were synthesized and characterized. The nanocrystals have a roughly spherical shape with particle diameter of about 10nm. Possible mechanism was proposed to explain the growth process. Upon the excitation at 395nm, the room-temperature emission spectrum of the nanocrystals in chloroform presents the characteristic transitions 5D0→7F J of Eu3+ ions, with 5D0→7F2 (610nm) transition as the most prominent group. The luminescence decay of Eu3+ ions in CaF2 nanocrystals was also investigated and two luminescence lifetimes of 737μs (11.2%) and 2.08ms (88.8%) were obtained. [Copyright &y& Elsevier]