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将稀土铕配合物—Eu(BA)3(TPPO)2分别组装到未修饰和修饰的介孔分子筛(SBA-15)中,详细地表征了样品的形貌和结构,系统地研究了其光致发光性质和稳定性,并与纯的稀土配合物进行比较研究。研究结果表明,SBA-15为组装的稀土配合物提供了良好的刚性环境,组装后的稀土铕离子配合物的光致发光稳定性比纯的配合物的光致发光稳定性有很大的提高。这将使稀土配合物在分子光学、电子器件等诸多领域具有重要的应用前景。 相似文献
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二苯甲酰甲烷2,2′—联吡啶混合稀土配合物中钆、钇对铕发光的影响 总被引:6,自引:3,他引:3
在乙醇溶液中合成了以二苯甲酰基甲烷(DBM)和2,2′联吡啶(Dipy)为配体,三价铕、等摩尔三价铕-钆及等摩尔三价铕-钇混合稀土为中心体的配合物。测定了配合物的组成,研究了其红外光谱和荧光光谱。结果表明:配合物的最佳激发波长为425nm;在425nm波长光激发下,配合物发出较强的荧光;不发光的Gd^3 和Y^3 离子对Eu^3 离子的发光有一定增强作用,其中钇使铕的荧光发射增强大于钆;这两个不发光稀土离子对铕的发射峰位影响不大。 相似文献
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合成了一个新的铕(III)配合物EuL3(phen)(L为去质子的1-(7-(叔丁基)-9-乙基-9H-咔唑-2-位)-4,4,4-三氟代-1,3-二氧代丁烷,phen为邻菲啰啉). 用元素分析、红外、核磁、紫外可见吸收光谱、热重分析、光致发光对该铕配合物进行了表征. 热重分析表明配合物的稳定性达到325 oC. 光致发光研究表明:该配合物发出强烈红光,其激发光谱延伸到可见光区域. 该配合物和460 nm发射的InGaN芯片组合得到了一个具有红光的发射的发光二极管. 该铕(III)配合物是蓝光激发的红色发 相似文献
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镧和铕与邻菲罗啉谷氨酸配合物的NMR和IR研究 总被引:1,自引:0,他引:1
合成了稀土镧和铕与谷氨酸,邻菲罗啉形成的二元及三元配合物,经元素分析确定该配合物的组成为Ln(phen)(Glu)3.7H2O(Ln=La,Eu);Eu(Glu)3;12H2O。用核磁共振和红外光谱研究与配体与稀土离子的配位方式,讨论了稀土离子的顺磁性及屏蔽效应对配合物的NMR谱图的影响。 相似文献
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铕-铽-柠檬酸-1,10-菲咯啉配合物的合成及荧光性质研究 总被引:2,自引:0,他引:2
分别合成了稀土(Eu^3 和Tb^3+)与柠檬酸、1-10非洛啉配位的稀土配合物,通过元素分析和红外分析确定了配合物的组成,通过荧光光谱与荧光寿命的测试,研究了它们的荧光性质,结果表明当铽掺入配合物,铽能极大地增强铕的特征荧光,而铽的荧光被严重猝灭,其荧光强度以指数形式衰减,铕的荧光在铽荧光猝灭最严重时,被增强的效果最好,铕的荧光强度是荧光增强效果和铕的含量共同作用的结果,当铕与铽的浓度比为6:4时能得到相应的铕的荧光最强的配合物。 相似文献
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铕与对甲基苯甲酸及2,2‘—联吡啶三元配合物的谱学研究 总被引:2,自引:0,他引:2
元素分析表明稀土铕(Eu^3+)与对甲基苯甲酸(P-MBA)及2,2’-联吡啶(dipy)形成的三元配合物组成为Eu2(P-MBA)6(dipy)2对甲基苯甲酸,2,2’-联吡啶均以双齿配位,中心铕离子的配位数为8,两个铕离子通过四个对甲基苯甲酸基桥联,形成双核配合物,对该配合物的结构作了核磁共振氢谱,碳谱及红外光谱的研究。 相似文献
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Rh基催化剂上氢甲酰化反应过程的原位高压NMR研究 总被引:1,自引:1,他引:0
制备了用于丙烯氢甲酰化反应的Rh/SBA-15 和PPh3修饰的PPh3-Rh/SBA-15催化剂. 应用原位变温高压核磁共振技术,对比研究了丙烯在Rh/SBA-15 和PPh3修饰的多相催化剂PPh3 Rh/SBA-15上的氢甲酰化反应,实现了高压条件下催化反应的原位固体核磁共振表征. 13C MAS NMR研究结果表明:在1.0 MPa的反应压力下,随着反应温度升高丙烯与合成气在Rh/SBA-15催化剂上可转化生成丁醛,而PPh3配体修饰的PPh3-Rh/SBA-15催化剂上丁醛产物的正异比显著提高. 相似文献
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Adsorption of pure CO2 on SBA-15 impregnated with branched polyethyleneimine (PEI) has been studied. Materials were prepared by impregnating the pore surface of SBA-15 mesoporous silica with different amounts of branched PEI (10, 30, 50 and 70 wt%). Textural properties, elemental analysis and low angle XRD measurements of the prepared samples showed a progressive pore filling of SBA-15 as PEI loading was increased. Pure CO2 adsorption isotherms on these modified SBA-15 materials were obtained at 45 °C, showing high adsorption efficiency for CO2 removal at 1 bar. Chemisorption of CO2 on amino sites of the modified SBA-15 seems to be the main adsorption mechanism. PEI content of impregnated SBA-15 influences the adsorption capacity of the material, being a relevant variable for CO2 removal by adsorption. Temperature effect on adsorption was also studied in the range 25-75 °C, showing that temperature strongly influences CO2 adsorption capacity. Adsorption capacity was also tested after regeneration of the PEI-impregnated SBA-15 materials. Our results show that these branched PEI-impregnated materials are very efficient even at low pressure and after several adsorption-regeneration cycles. 相似文献
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Tao Tang Yanling Zhao Yao Xu Dong WuJun Xu Feng Deng 《Applied Surface Science》2011,257(14):6004-6009
To investigate the driving force for bilirubin adsorption on mesoporous materials, a comparative study was carried out between pure siliceous SBA-15 and three functionalized SBA-15 mesoporous materials: CH3-SBA-15 (MS), NH2-SBA-15 (AS), and CH3/NH2-SBA-15 (AMS) that were synthesized by one-pot method. The obtained materials exhibited large surface areas (553-810 m2/g) and pore size (6.6-7.1 nm) demonstrated by XRD and N2-ad/desorption analysis. The SEM images showed that the materials had similar fiberlike morphology. The functionalization extent was calculated according to 29Si MAS NMR spectra and it was close to the designed value (10%). The synthesized mesoporous materials were used as bilirubin adsorbents and showed higher bilirubin adsorption capacities than the commercial active carbon. The adsorption capacities of amine functionalized samples AMS and AS were larger than those of pure siliceous SBA-15 and MS, indicating that electrostatic interaction was the dominant driving force for bilirubin adsorption on mesoporous materials. Increasing the ionic strength of bilirubin solution by adding NaCl would decrease the bilirubin adsorption capacity of mesoporous material, which further demonstrated that the electrostatic interaction was the dominant driving force for bilirubin adsorption. In addition, the hydrophobic interaction provided by methyl groups could promote the bilirubin adsorption. 相似文献
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本文首先制备并表征了介孔二氧化硅SBA-15、 填充导电聚合物的复合材料PANI/SBA-15和复合材料PPy/SBA-15, 并建立双流计实验台开展了材料压片情况下的热导率研究. 在测量得到复合材料热导率的基础上, 引入当量孔径, 结合测量孔径对 PANI/SBA-15和PPy/SBA-15复合材料热导率随填充量的变化进行了定性分析. 分析表明: PANI/SBA-15和PPy/SBA-15复合材料的热导率比基材SBA-15的热导率大得多; 在相同的测量孔径和当量孔径情况下, PANI/SBA-15复合材料的热导率比PPy/SBA-15复合材料的热导率大; 导电聚合物填充到复合材料孔道内和孔道外都有助于热导率的提高, 填充到孔道内比填充到孔道外对热导率提高的贡献更大. 相似文献
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A new dirhenium(I) complex fac-[{Re(CO)3(4,7-dinonadecyl-1,10-phenanthro -line)}2 (4,4′-bipyridyl)] (trifluoromethanesulfonate)2 (denoted as D-Re(I) ) is assembled in MCM-41 and SBA-15 type mesoporous silica support. The emission peaks of D-Re(I) in D-Re(I)/MCM-41 and D-Re(I)/SBA-15 are observed at 522 and 517 nm, respectively. Their long excited lifetimes, which are of the order of microseconds, indicate the presence of phosphorescence emission arising from the metal to ligand charge-transfer (MLCT) transition. The luminescence intensities of D-Re(I)/MCM-41 and D-Re(I)/SBA-15 decrease remarkably with increase in the oxygen concentration, meaning that they can be used as optical oxygen sensing materials based on luminescence quenching. The ratios I0/I100 of D-Re(I)/MCM-41 and D-Re(I)/SBA-15 are estimated to be 5.6 and 20.1, respectively. The obtained Stern-Volmer oxygen quenching plots of the mesoporous sensing materials could be fitted well to the two-site Demas model and Lehrer model. 相似文献
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以1S,2S-环己二胺和乙酰丙酮进行缩合得到N,N′-双(乙酰丙酮)-1S,2S-环己二胺的Schiff碱配体L,再将配体L与MnCl2.4H2O进行配位反应,得到了配合物[MnL2Cl2.L]n(1),并用元素分析和X射线单晶衍射进行了表征。结果表明,配合物1属于正交晶系,空间群是P212121,晶体参数:a=1.56630(15)nm,b=1.59373(16)nm,c=2.1963(2)nm,V=5.4827(9)nm3,Z=4,Dc=1.164g.cm-3,R1=0.0548,wR2=0.1368。在配合物1中,每个Mn()的配位环境都是三角双锥。配合物中双齿配体通过其两臂乙酰丙酮亚胺单元的端基氧原子同2个金属离子配位桥联形成一维螺旋链结构。 相似文献
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《Solid State Ionics》2006,177(15-16):1287-1291
Silane-functionalized mesoporous silica SBA-15 particles with ultra-high specific surface area and large pore size were used as fillers in PEO-based solid electrolytes. FT-IR results confirmed the silane functionalization of SBA-15. Ionic conductivity and lithium ion transference number of the composite polymer electrolytes were found to simultaneously reach a high value of 5 wt.% silane-functionalized SBA-15 introduced in the matrix. It may be due to the combination effects of the unique structure of SBA-15 (i.e., ultra-high specific surface area and large pore size), the particularly functionalized surface of SBA-15 to promote fast ion transfer, and the good dispersion and compatibility of silane-functionalized SBA-15 in the composite polymer electrolytes. The results suggest an alternative way to improve the performance of solid polymer electrolytes. 相似文献
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An experimental study on the effect of mesoporous silica addition on ion conductivity of poly(ethylene oxide) electrolytes 总被引:1,自引:0,他引:1
Solid polymer electrolyte (SPE) composites, which are composed of poly(ethylene oxide) (PEO), mesoporous silica (SBA-15), and lithium salt were prepared in order to investigate the influence of SBA-15 content on the ionic conductivity of the composites. The ionic conductivity of the SPE composites was monitored by frequency response analyzer (FRA), and the crystallinity of the SPE composites was evaluated by using XRD. As a result, the addition of SBA-15 to the polymer mixture inhibited the growth of PEO crystalline domain, due to the mesoporous structure of the SBA-15. Also, the PEO16LiClO4/SBA-15 composite electrolytes show an increased ion conductivity as a function of SBA-15 content up to 15 wt.%. These ion conductivity characteristics are dependent on crystallinity with SBA-15 content. 相似文献
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合成了Eu(Ⅲ)与偏苯三甲酸(TLA)、2-噻酚甲酰三氟丙酮(HTTA)和邻菲罗啉(Phen)形成的两个新的四元配合物。运用元素分析、红外光谱、扫描电镜、热重与荧光光谱等手段对它们进行了系统的表征。研究结果表明,偏苯三甲酸与2-噻酚甲酰三氟丙酮Eu(Ⅲ)和邻菲罗啉形成的四元配合物,具有比偏苯三甲酸Eu(Ⅲ)和邻菲罗啉形成的三元配合物更强的荧光强度与更宽的紫外激发,比配合物Eu(TTA)3Phen更好的热稳定性。得到了两种热稳定性较好的鲜艳红色荧光材料。 相似文献