| Thirteen binary complexes of Eu(Ⅲ) and thirteen binary complexes of Tb(Ⅲ) have been synthesized.In these complexes,thirteen aromatic carboxylic acids were used as the first ligand.The compositions of these complexes were comfirmed by elemental analysis(C,N,H) and EDTA titration for rare earth.The complexes were characterized by means of IR,UV,TG-DTG methods.In these complexes,the Eu(Ⅲ) and Tb(Ⅲ) ions were bonded to the oxygen atoms of carboxylate.Using 4-(Trifluoromethyl) benzoic acid as the first ligand,and 2,2'-bipyridine as the second neutral ligand,we synthesized the ternary terbium te complex and obtained the crystal.The structure of the Tb2(p-TFBA)3(2,2'-bipy)2 has been determined by using X-ray diffraction.The composition exists as binuclear molecule,and crystallize in monoclinic,space group C2/c.The crystallographic parameters are as follows:a=16.2875(6) (?),b=24.9867(9)(?),c=18.8442(6)(?);α=90°,β=114.9490(10)°,γ=90°.The luminescence spectra of the Eu(Ⅲ) and the Tb(Ⅲ) complexes show that the positions of emission peaks remain unchanged.However,the emission intensity of the complex changes due to the different ligands.The major works in this paper are focused on:(ⅰ) the chosing of the best luminescent complex in each series;(ⅱ) the influence of different substituents on the luminescent intensity.These results will provide valuable information for the synthesis of new effective rare earth luminescence materials. |
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