摘要
以邻、间、对甲氧基苯甲酸(o MOBA,m MOBA,p MOBA)为第一配体,以1,10邻菲啰啉(phen)为第二配体,合成了三种甲氧基苯甲酸铽(Ⅲ)与1,10邻菲啰啉的三元配合物ü胤治觥⑴湮坏味ǚ治?确定了配合物的组成分别为Tb(o MOBA)3phen·H2O、Tb(m MOBA)3phen·H2O和Tb(p MOBA)3phen。通过红外光谱对配合物的结构进行了表征,结果表明在配合物中羧基氧原子和邻菲啰啉中的氮原子均参与了配位ü夤馄追治?探讨了第一配体取代基位置的变化,对三元配合物的发光性能的影响。结果表明,三种配合物均具有优良的光致发光性能,各配合物的相应跃迁发射峰位基本上没有变化,5D4→7F6、5D4→7F5两个较强发射峰的强度顺序为:Tb(o MOBA)3phenoH2O>Tb(m MOBA)3phenoH2O>Tb(p MOBA)3phen。
Many organic complexes of rare earth(Sm,Eu,Tb,Dy) have a fine luminescent properties. Because the homochromatism theirs fluorescence is good, the intensity of luminescent and their interior quantum efficiency are higher, that is benefit to the panchromatic display. In recent year it caused denseness interest in high-tech industry and the application foreground is very vast. For looking for the good photoluminescence and electroluminescence materials, in our work three ternary complexes of Tb were synthesized with o,m,p-methoxybenzoic acid (o-MOBA, m-MOBA, p-MOBA) as the first ligand and 1,10-phenanthroline(phen) as the second ligand.The content of Tb,C,H and N were measured by using EDTA titration method and a Flash-EA model 1112 elemental analyzer. The constitution of the three complexes was confirmed respectively as follows:(Tb(o-MOBA)_3phen·H_2O, ) Tb(m-MOBA)_3phen·H_2O and Tb(p-MOBA)_3phen.The IR spectra of free ligands and complexes were recorded by model 1730 Fourier transform infrared spectroscopy with KBr pellet in the range of 350~3 500 cm^(-1). The results show that two characteristic absorption peak(υ_(CO),δ_(O—H)) of methoxybenzoic acid disappeared and the anti-symmetric and symmetric (stretching) vibration absorption peak of carboxyl(υ_(as),υ_s) appeared in the complexes. These reveals that (methoxybenzoate) took part in the coordination. The characteristic absorption peak of phen(υ_(CN),δ_(C—H)) shifted to lower frequencies at different degree in the title complexes, which shows two nitrogen atoms in the phen also took part in the coordination.Excitation and luminescence spectra of the title complex were carried out and recorded by using a Hitachi F-4500 fluorescence spectrophotometer. Excitation spectra of the title complexes were obtained in a rang e of 200~450 nm. Fluorescence spectra was observed in a range of 400~700 nm. The fluorescence spectra data shows four characteristic emission peak centered at 489, 545, 582 and 621 nm, which originated from the (~5D_4→~ 7F_J(J=6~3)) transition of Tb^(3+) ion respectively. The intensity of the transition fluorescence centered at 545 nm is the highest. The intensity of the transition fluorescence of the three complexes at 489 and 545 nm decreases according to the order o,m,p-methoxybenzoic acid. In a conclusion, three complexes of the terbium, Tb(o-MOBA)_3phen·H_2O, Tb(m-MOBA)_3phen·H_2O and Tb(p-MOBA)_3phen were synthesized in C_2H_5OH solution. They result in strong emission with green color, among them the luminescent intensity of Tb(o-MOBA)_3phen·H_2O is the highest.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2005年第3期344-348,共5页
Chinese Journal of Luminescence
基金
河北省自然科学基金资助项目(203148
202140)
