共查询到19条相似文献,搜索用时 78 毫秒
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以右旋联萘酚和稀土为原料,在无水无氧下合成了2个配合物[(THF)2Na]3[Sm(R-BINOLate)3](1)与[(THF)2Na]3[Gd(R-BINOLate)3](2)。以异丙醇作氢源,在常压下配合物(1)和配合物(2)用于苯乙酮不对称氢转移反应。考察了催化剂种类、催化剂用量、反应温度对底物转化率和产物对映选择性的影响规律。结果表明,在室温条件下反应24 h,5%的配合物(1)催化苯乙酮的不对称还原反应,反应产物S-苯乙醇的e.e.值可达94%;5%的配合物(2)催化苯乙酮的不对称还原反应,反应产物S-苯乙醇的e.e.值可达85%。 相似文献
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本文介绍了两支1,1′-联萘类荧光染料的合成方法,通过核磁和质谱等表征了染料化合物的结构,并测试了其在固体和溶液中的紫外吸收、荧光发射、荧光寿命以及荧光量子产率等性能。 相似文献
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合成了以草酸和邻菲啰啉为配体,铈为中心离子的三元固体配合物。通过元素分析、配位滴定分析,确定了配合物的组成为[Ce(OOC-COO)(phen)].H2O。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。通过热重分析(TGA)测定了配合物的热性能,结果表明,该配合物具有较好的热稳定性。在波长275 nm紫外光激发下,测定了配合物的荧光光谱,其结果表明,配合物吸收光能后将能量通过无辐射驰豫的方式传递给了稀土中心离子,发射570 nm特征荧光,且发射谱线很窄,主发射峰为Ce3+的2D5/24-F7/2跃迁,表明合成的新型稀土配合物可作为电致发光器件的发光材料。 相似文献
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1,10‐Phenanthroline‐functionalized polyaryletherketone (PPEK) was synthesized by the amidation reaction of 5‐amino‐1,10‐phenanthroline with polyaryletherketone containing pendant acyl chloride groups. Subsequently, a series of novel rare earth coordination polymers (with rare earths Eu3+, Tb3+, Sm3+ and Dy3+) were prepared, using PPEK as macromolecular ligand and the small 1,10‐phenanthroline (Phen) molecule as synergistic ligand. Their structures were characterized using Fourier transform infrared spectroscopy, elemental analysis and X‐ray diffraction, which confirmed that both PPEK and Phen participated in the coordination reaction with the rare earth ions, and that the rare earth ions could disperse homogeneously in the polymer matrix. The rare earth coordination polymers were soluble in polar solvents such as N,N‐dimethylformamide, N,N‐dimethylacetamide and N‐methylpyrrolidone, and could be easily cast into transparent tough thin films. Fluorescence measurements indicated that all the coordination polymers exhibited the intense characteristic fluorescence of the corresponding rare earth ions under ultraviolet excitation, showing their application potential in optical display devices. Copyright © 2010 Society of Chemical Industry 相似文献
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Poly acrylic acid (PAA) and its stoichiometric complexes with trivalent rare earth (RE) have been synthesized and well characterized by means of elemental analysis, IR, TG‐DTA, fluorescence spectra, etc. Chemical analysis indicated that the molar ratio of ? COO? and RE3+in the complex was closely dependent on the pH and the molar ratio of PAA and RE in the feed. The stoichiometric complexes in which the molar ratio of ? COO? and RE3+ is 3:1 can be formed under the conditions of pH 6.0 and PAA:RE = 3:1 (molar ratio in the feed). Spectroscopic studies suggested that the carboxylate bonded to the central metal ions was in the form of bidentate and these stoichiometric complexes possessed high‐temperature resistance. Due to efficient energy transfer from polymer to central metal ions, the emission intensity of Eu3+ and Tb3+complexes was stronger than that of simple compounds. Therefore, these complexes can be promising as potential fluorescent probes and photoluminous materials. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 351–357, 2007 相似文献
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稀土配合物及其共聚物的合成与性能研究 总被引:1,自引:1,他引:1
以丙烯酸(HAA)、甲基丙烯酸(HMA)及1,10-邻菲罗啉(Phen)为配体与氧化铕(Eu2O3)反应得到二元配合物Eu(AA)3、Eu(MA)3和三元配合物Eu(AA)3Phen、Eu(MA)3Phen。将生成的配合物与HMA和甲基丙烯酸甲酯(MMA)共聚,得到一系列三元共聚物。通过元素分析、红外光谱、荧光光谱和热分析对配合物进行了分析与表征,发现配合物具有良好的荧光强度和热稳定性。三元配合物的荧光强度相对于二元配合物有显著提高。共聚物可发射Eu3+的特征荧光,荧光强度随配合物含量的增加而增加,且未发生浓度猝灭现象。三元配合物在反应单体MMA和HMA中的溶解度低于二元配合物,从而使在最大溶解度下二元配合物与反应单体生成共聚物的荧光强度高于相应的三元配合物与反应单体生成的共聚物。 相似文献
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稀土-蛋氨酸-邻菲咯啉配合物的合成、表征及抗菌活性研究 总被引:2,自引:1,他引:2
采用冷凝回流法合成了4种新型稀土(镧、铕、钐和钕)-蛋氨酸-邻菲咯啉三元配合物,通过元素分析、EDTA-滴定、摩尔电导、红外光谱,确定了配合物的组成为RE(Met)_3phenCl_3·3H_2O(RE:La~(3+)、Eu~(3+)、Sm~(3+)、Nd~(3+);Met=L-蛋氨酸;phen=邻菲咯啉).抗菌活性的研究表明,与配体相比,稀土三元配合物对大肠杆菌(Escherichia coli)和金黄色葡萄球菌(Staphylococcus aureus)均具有更强的抑菌能力. 相似文献