Study on Synthesis and Fluorescent Properties of Ternary and Quaternary Rare Earth Europium Complexes

Abstract

Synthesis and fluorescent properties of rare earth Rare earth complexes ultraviolet photochromic materials such as ternary and quaternary europium complexes were synthesized in this,we selected the high luminescent β-diketones such as α-thenoyltrifluoroacetone(HTTA),fine fragrant carboxylic acid and o-phenanthroline as ligands. The structure of the ternary and quaternary europium complexes were studied by IR spectrum, indicated that these complexes have bonded with the ligands. The fluorescent properties were studied systematically by fluorescence spectrophotometer, relative fluorescence intensity of the ternary and quaternary europium complexes were quantitative determinated ,these europium complexes showed invisible in the visible light and showed obvious red fluorescence under ultraviolet light. This study of the rare earth europium photochromic materials have theoretical and practical application guidance to security printing ink and packing. Experiment shows, The fluorescence properties of Eu(BA)3Phen and Eu(BA)(TTA)2Phen indicated that two excitation spectrum are banded spectrum, the energy which the ligands have absorbed transmitted effectively to europium ion. The fluorescence emission bands of Eu(BA)3Phen and Eu(BA)(TTA)2Phen are similar, but the relative fluorescence intensity of5D0→7F2of Eu(BA)(TTA)2Phen is far bigger than Eu(BA)3Phen. The two complexes have the low symmetry, have the good monochromaticity.