Preparation And Properties Of Fluorescence Complexes Of Europium Adulterated By Lanthanum And Gadolinium

The research of the rare earth luminescent complexes is belong to the cross field of inorganic, organic and biological luminescence research. This kind of luminnescent material has widely been applied to many high-tech areas. In this dissertation, one hundred and eight new red fluorescence complexes of europium adulterated by cheap non- fluorescence lanthanum or gadolinium with the first ligands of the cheap and popular aromatic carboxylic acid (m-chlorobenzoic acid, p-methylbenzoic acid, methoxybenzoic acid, p-hydroxylbenzoic acid, benzoic acid) and 1,10-phenanthroline, and the second ligands of oleic acid and undecenoic acid have been synthesized under the best optimisation synthesis conditions. Their molecular compositions and structures were characterized by means of elemental analysis, EDTA titrimetric method, FT-IR and UV spectroscopies; their thermal properties were studied by thermal analysis instrument; Their luminescent properties were investigated by means of fluorescence instrument. The main results are as follows:1. The fluorescence intensity of the complexes of europium adulterated by lanthanum or gadolinium has relationships with the structure of ligands and complexes. The ability order of the first ligand transferring light energy to the central europium ion was that of p-methylbenzoic acid > m-chlorobenzoic acid > benzoic acid > methoxybenzoic acid > 1,10-phenanthroline > p-hydroxylbenzoic acid in the Eu_kLa_1-k(X)₂(UA)·3H₂O. The ability order of the first ligand transferring light energy to the central europium ion was that of m-chlorobenzoic acid > 1,10-phenanthroline > methoxybenzoic acid > p-methylbenzoic acid > benzoic acid > p-hydroxylbenzoic acid in the EukGd1-k(X)2(UA)·3H2O. The ability order of the first ligand transferring light energy to the central europium ion was that of p-methylbenzoic acid > 1,10-phenanthroline > benzoic acid > methoxybenzoic acid > m-chlorobenzoic acid > p-hydroxylbenzoic acid in the EukLa1-k(X)2(OA)·3H2O. The ability order of the first ligand transferring light energy to the central europium ion was that of 1,10-phenanthroline > p-methylbenzoic acid > methoxybenzoic acid > m-chlorobenzoic acid > benzoic acid > p-hydroxylbenzoic acid in the EukGd1-k(X)2(OA)·3H2O.2. The adulteration of the non- fluorescence lanthanum or gadolinium ions can enhance the fluorescence intensity of the complexes of europium,but only have little influence on the locations of the fluorescence characteristic peaks. The fluorescence intensity of the complexes of europium increased with the increment of adulteration...