铕与苯甲酸及其衍生物配合物的光谱分析

合成了铕与苯甲酸及其衍生物(苯甲酸、邻苯二甲酸、间苯二甲酸、水杨酸、邻氨基苯甲酸、磺基水杨酸)的二元配合物.经元素分析确定其组成式.研究了它们的红外吸收光谱、紫外吸收光谱及荧光光谱.紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收.红外光谱的研究表明,配合物的红外光谱不同于自由配体的红外光谱,证明了稀土与有机物形成了配合物.荧光光谱的研究表明,其中铕与苯甲酸、邻苯二甲酸及间苯二甲酸形成的配合物表现出铕的特征荧光.其中以苯甲酸铕的发射峰最强,最强发射峰位于λ=618nm处,显示铕的红光特征;而铕与磺基水杨酸、邻氨基苯甲酸、水杨酸的配合物却主要表现出配体的宽带发射,其中邻氨基苯甲酸铕分别在λ=399,452,547nm处有三个弱的发射峰,磺基水杨酸铕也只在λ=407nm处有一宽发射峰,未显示出铕的红光特征.

Spectra Analyses of Europium Complexes with Benzoic Acid and Its Derivatives

In order to study regularity of fluorescence of complexes about rare earth with different benzoic acid,we have prepared much of BA-compiexes,RC₆H₄COOH(R=o-NH₂,H,p-NH₂,o-OH,m-Cl,o-COOH,m-COOH,p-COOH,p-OH,m-NO₂,3,5-Dinitro,p-Br,o-I,2-OH-5-SO₃H.They can be synthesized complexes with Sm³⁺,Eu³⁺,Tb³⁺,Gd³⁺.Under UV-excitation the complexes with Eu³⁺,Tb³⁺ have higher emitting intensity than complexes with Sm³⁺,Gd³⁺.There are some science bases about study a new luminophor.Spectra analyses of the complexes of europium with benzoic acid and its derivatives are discussed.The binary complexes of europium with benzoic acid and its derivatives benzene carbonic acid,phthalic acid,isophthahc acid,salicylic acid,o-aminobenzoic acid sulfosalicylic acid have been synthesized.They were characterized by elemental analysis,UV-Vis,IR,H NMR,fluorescence spectra and molar conductance.The UV spectra showed that the complexes' ultraviolet absorption were from the ligands(220-350 nm),so that it could transfer energy to rare earth.The measurement results of the emission spectra of the complexes indicated as follows the emission of Eu(BA)₃,Eu(m-Phth)₃·3H₂O and Eu(o-Phth)₃·3H₂O consisted of three peaks at 582,596,and 618 nm which were caused from ⁵D₀→⁷F_J(J=0,1,2)transition of Eu³⁺ respectively.Among these peaks the emission from ⁵D₀→⁷F₂ is the shrongest.But the emission of Eu o-aminobenzoic acid consisted(of three)peaks at 399,452,547 nm,and that of sulfosalicylic acid-Eu only one peak at 407 nm,which(were caused)from ligands.Fluorescence spectra show that there aren't red-characteristic emission of Eu in Eu(o-Amino)₃ and Eu(Ssal)₃.