【摘要】 合成了顺丁烯二酸单苯酯,并制备了它的一系列稀土配合物REL3·4H2O(RE=La3+、Ce3+、Sm3+、Eu3+、Gd3+、Tb3+、Y3+)。利用元素分析、TGDTA分析、IR光谱、1HNMR和13CNMR测试技术对配合物进行了表征,确定了其组成。结果显示,在配合物中,配体HL的羧基Δν均远远小于NaL的Δν(196cm-1),表明羧基以双齿配位的形式与稀土离子结合;酯羰基(νC=O)向高波数移动,出现在1740～1743cm-1范围内,可以推测醚氧键上的氧原子参与了配位,而酯羰基上的氧不参与配位,核磁研究也证实了以上结论;在配合物所含的4个分子水中,仅有1个水分子上的氧参与了配位。研究了固态稀土配合物的荧光性质,分别在617和545nm处观察到了Eu3+和Tb3+配合物的强荧光发射峰,表明配体最低激发三重态能级与Eu3+,Tb3+激发态能级之间存在着有效的能量传递。更多还原

【Abstract】 2-Butenedioic acid (z)-monophenyl ester and its solid rare earth complexes REL_ 3·4H_ 2O(RE=La 3+,Ce 3+,Sm 3+,Eu 3+,Gd 3+,Tb 3+,Y 3+) were synthesized and characterized by means of elemental analysis, TG-DTA, IR and NMR. The results show that the frequency differences(Δν)( 100~124 cm -1) of the carboxylic stretching in the complexes were much smaller than that in the corresponding sodium salt NaL(about 196 cm -1), which indicates that the carboxylic groups in the complexes coordinate to the rare earth ions in the form of a bidentate ligand. The ν_ C=O of the ester groups in the complexes shifted to higher wave numbers in the 1 740~1 743 cm -1 region, which suggests that the ethereal oxygen in the complexes coordinates to RE 3+, but the carbonyl oxygen of the ester does not take part in the coordination. The NMR study has proved this conclusion. In the four water molecules, just one coordinates to the cation. The fluorescence spectra of the complexes in solid state were also studied. The strong fluorescence emitting peaks at 617 nm for Eu 3+ and 545 nm for Tb 3+ observed could be attributed to the effective energy transfer between the ligand triplet levels and the emitting levels of the Eu 3+ and Tb 3+.更多还原