| Four series of twenty-five solid complexes of rare earth with biphenyl 4-carboxylic acid and phen have been synthesized and characterized in this article. Their elemental analysis, molar conductivities and TG-DTA studies indicate that the complexes have the composition of. Sm(?)3 . 3H2O, (SmRE)0.5 (?)3. 3H2O,Sm(phen)(?)3 . 1/2H2O, (SmRE)0.5(phen)(?)3.1/2H2O; Eu(?)3 .nH2O (EuRE)0.5(?)3 . 3H2O, Eu(phen)(?)3 . 1/2H2O, (EuRE)0.5(phen)(?)3 . 1/2H2O; Tb(?)3 . 3H2O, (TbRE)0.5(?)3 .3H2O,Tb(phen)(?)3.1/2H2O, TbRE)0.5(phen)(?)3 . 1/2H2O; Dy(?)3 . 3H2O (DyRE)0.5(?)3 . 3H2O, Dy(phen)(?)3 . 1/2H2O , (DyRE)o.5(phen)(?)3 . 1/2H2O. In these rare earth complexes, rare earth ion coordinate with two nitrogen atoms of phen molecules directly, Their IR spectra , UV, 1HNMR and molar conductivities be studied. The results indicate that biphenyl 4-carboxylic acid is bounded with RE(III) ion; The fluorescence spectra and fluorescence lifetimes of rare earth ions show that the fluorescent intensity and lifetime of a series of europium complexes are higher than the series of terbium' s when they have the same ligands. There are better fluorescent intensity and lifetime of heteronuclear rare earth complexes than homonuclear rare earth complexes for Europium's complexes. The fluorescence emission intensity of are Eu3+ raised by inert fluorescent rare earth(Y3+,La3+),but in Tb3+ heteronuclear rare earth complexes and the intensity of Tb3+ ion are quenched by inert fluorescent rare earth(Y3+,La3+,Gd3+). |
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