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| 三价铕荧光络合物与聚乙烯吡咯烷酮复合物研究 | |
| 引用本文： | 郝超伟,赵莹,徐怡庄,王笃金,徐端夫.三价铕荧光络合物与聚乙烯吡咯烷酮复合物研究[J].光谱学与光谱分析,2008,28(9):2115-2118. |
| 作者姓名： | 郝超伟 赵莹 徐怡庄 王笃金 徐端夫 |
| 作者单位： | 1. 中国科学院化学研究所，北京分子科学国家实验室，高分子科学与材料联合实验室，高分子物理与化学国家重点实验室，北京 100190 2. 北京大学化学与分子工程学院，稀土材料化学及应用国家重点实验室，北京 100871 3. 杭州师范大学，有机硅化学及材料技术教育部重点实验室，浙江 杭州 310012 4. 中国科学院研究生院，北京 100039 |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| 摘 要： | 为研究稀土荧光络合物与高分子形成的复合物的结构与发光性能间的关系，利用α-噻吩甲酰三氟丙酮（TTA）和三苯基氧化膦（TPPO）与氯化铕（EuCl3）分别制备了Eu(TTA)3·2H2O和Eu(TTA)3·(TPPO)2络合物，及其与聚乙烯吡咯烷酮（PVP）的复合物。采用荧光光谱，红外光谱和透射电镜等方法对复合物进行了表征。荧光光谱测定结果表明Eu(TTA)3·2H2O与PVP K30结构单元摩尔比为1∶35的PVP/Eu(TTA)3·2H2O复合物的612 nm发射峰的荧光强度较Eu(TTA)3·2H2O络合物有显著提高。红外光谱研究表明络合物的Eu3+与PVP分子的羰基之间存在着明显的配位作用，并且存在多种配位方式。透射电镜观察结果表明复合物具有微相分离结构，其中的稀土络合物为无定形结构，这进一步表明PVP与络合物分子间存在相互作用。 |
| 关 键 词： | 稀土荧光络合物 聚乙烯吡咯烷酮 红外光谱 荧光光谱 透射电镜 |
| 收稿时间： | 2007-03-06 |
Investigation on Composites of Europium Fluorescent Complexes and Polyvinylpyrrolidone |
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| HAO Chao-wei,ZHAO Ying,XU Yi-zhuang,WANG Du-jin,XU Duan-fu.Investigation on Composites of Europium Fluorescent Complexes and Polyvinylpyrrolidone[J].Spectroscopy and Spectral Analysis,2008,28(9):2115-2118. | |
| Authors: | HAO Chao-wei ZHAO Ying XU Yi-zhuang WANG Du-jin XU Duan-fu |
| Abstract: | In order to investigate the relationship between the aggregation structure and fluorescence properties of composites of rare earth fluorescent complexes and polymers, the fluorescent complexes of Eu(TTA)3·2H2O and Eu(TTA)3·(TPPO)2 were synthesized by the reaction of TTA(2-thenoyltrifluoroacetone), TPPO(triphenylphosphine oxide) and EuCl3, and their composites with polyvinylpyrrolidone (PVP K30) were prepared. The fluorescence spectroscopy, FTIR spectroscopy and TEM were used to characterize these composites. Fluorescence spectroscopy results indicated that the fluorescence intensity of the PVP/Eu(TTA)3·2H2O composites is obviously improved compared with that of the Eu(TTA)3·2H2O complexes. For the composites with the molar ratio of the complexes to the repeat unit of PVP being 1∶35, the intensity of 612nm emission peak of the composites is 5.5 times for PVP/Eu(TTA)3·2H2O and 0.3 times for PVP/Eu(TTA)3·(TPPO)2 higher than that of the corresponding pure rare earth fluorescent complexes. And the emission intensity ratio of 612 to 590 nm peak is 14.7 in PVP/Eu(TTA)3·2H2O composite, larger than that of Eu(TTA)3·2H2O complexes. These results suggested that the luminescent properties of the europium fluorescent complexes were obviously enhanced in the presence of PVP matrix and there are interactions between the fluorescence complexes and PVP molecules. In the presence of PVPK30, the FTIR spectra of the Eu(TTA)3·2H2O complexes were obviously influenced as well. Based on the curve-fitting results of IR spectra of PVP/Eu(TTA)3·2H2O composites with the molar ratio of repeat unit of PVP to Eu(TTA)3·2H2O being 7∶1 and 2∶1, multiple absorption peaks of νCO are observed. The IR spectral variations indicated that there are coordination interactions between Eu3+ ions and the carbonyl groups of PVP, and multiple coordination fashion exists. TEM results showed that there are microphase separation structures in PVP/Eu(TTA)3·2H2O and PVP/Eu(TTA)3·(TPPO)2 composites. The microphase separation phenomenon in composite of PVP/Eu(TTA)3·(TPPO)2 is more obvious than that of the PVP/Eu(TTA)3·2H2O. And the Europium complexes are in amorphous state, which further proved the interactions between PVP molecules and the rare earth fluorescence complexes Eu(TTA)3·2H2O and Eu(TTA)3·(TPPO)2. |
| Keywords: | Rare earth fluorescence complexes Polyvinylpyrrolidone IR spectroscopy Fluorescence spectroscopy TEM |
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