摘要
分别以苯甲酸、苯乙酸、β-苯丙酸、苯丙烯酸为第一配体,1,10-邻菲口罗啉或2,2′-联吡啶为第二配体,合成了7种铕(Ⅲ)的三元配合物。通过元素分析、配位滴定分析,确定了各配合物的组成。通过红外光谱对配合物的结构进行了初步表征,在配合物中羧基氧原子和邻菲口罗啉及联吡啶中的氮原子均参与了配位。采用TG-DTG技术对7种配合物的热分解过程进行了研究,以phen为第二配体的4种铕(Ⅲ)的三元配合物具有良好的热稳定性。室温下测定了各配合物粉末的激发和发射光谱。结果表明:羧酸配体相同,以邻菲口罗啉为第二配体的配合物的荧光强度要大于以联吡啶为第二配体的配合物的相应荧光强度。7种铕(Ⅲ)的三元配合物中,最强发射峰强度顺序为:Eu(-βPPA)3phen>Eu(BA)3phen>Eu(PLA)3phen>Eu(BA)3bipy>Eu(PLA)3bipy>Eu(CA)3phen.H2O>Eu(CA)3bipy(其中BA为苯甲酸根、PLA为苯乙酸根、β-PPA为β-苯丙酸根、CA为苯丙烯酸根、phen为1,10-邻菲口罗啉、bipy为2,2′-联吡啶)。
Seven ternary Eu （Ⅲ） complexes were synthesized with aromatic carboxylic acid （benzoic acid, phenylacetic acid, phenylpropionic acid and cinnamic acid） as the first ligand and 1, 10-phenanthroline or 2,2＇-dipyridyl as the second ligand. The ternary Eu（Ⅲ） complexes were characterized by elemental analysis, IR and TG-DTG methods. In these complexes, the Eu（Ⅲ） ions are bonded to the oxygen atoms of carboxylate and the nitrogen atoms of neutral ligands. Four complexes whose second ligand is 1,10-phenanthrolin have fine thermal stability. Excitation and luminescence spectra of the title complexes reveal that the fluorescences of the complexes in which 1,10-phenanthrolin as the second ligand are more intensive than those complexes in which 2,2＇-dipyridyl as the second ligand. The order of the strongest emission peak of seven ternary complexes is： Eu （β-PPA）3phen 〉 Eu （BA）3phen 〉 Eu （PLA）3phen 〉 Eu （BA）3bipy 〉 Eu （PLA）3bipy 〉 Eu （ CA ）3phen · H2O 〉 Eu （ CA ）3bipy （BA： benzoate; PLA： phenylacetate; β-PPA： phenylpropionate; CA： cinnamate; phen： 1,10-phenanthroline and bipy： 2,2＇-dipyridyl）.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2006年第3期274-278,共5页
Journal of the Chinese Society of Rare Earths
基金
河北省自然科学基金资助项目(203148)
关键词
芳香羧酸
铕
三元配合物
热重
荧光光谱
稀土
aromatic carboxylic acid
europium
ternary complex
thermal decomposition
fluorescence spectra
rare earths
