名称:
                                Synthesis, crystal structures and fluorescence properties of dinuclear Tb(III) and Sm(III) complexes with 2,4,6-tri(2-pyridyl)-1,3,5-triazine and halogenated benzoic acid
                             
                            
                                摘要:
                                Three ternary lanthanide complexes with o-bromobenzoic (o-BrBA), o-chlorobenzoic acid (o-ClBA) and 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ) have been synthesized. These complexes were characterized by elementary analysis, UV absorption spectroscopy and IR spectroscopy. The crystal structures of [Tb-2(TPTZ)(2)(o-BrBA)(4)(NO3)(2)(H2O)(2)] (1), [Tb-2(TPTZ)(2)(o-ClBA)(3)(NO3)(2)(H2O)(3)]center dot o-ClBA center dot C2H5OH center dot 2H(2)O (2) and [Sm-2(TPTZ)(2)(o-ClBA)(4)(NO3)(2)(H2O)(2)] (3) were determined by single-crystal X-ray diffraction, and they were all dinuclear complexes with the characteristic of triclinic and P-1 space group. The crystals 1 and 3 were isostructural, whose center ions were bridged by mu(2)-o-BrBA /mu(2)-o-ClBA ions and the coordinate number of the central metal ions were nine, composed by a eta(3)-TPTZ, two bridging bidentates and one monodentate o-BrBA (o-ClBA) ligand, a bidentate NO3 and a coordinated water molecule. But the structure of complex 2 was asymmetric and the two Tb(III) ions have different coordination surroundings. Furthermore, the luminescence spectra and luminescence lifetimes of three crystals were then measured. Besides, the two Tb(III) complexes exhibit high emission quantum efficiencies. (C) 2014 Elsevier B. V. All rights reserved.