排序方式: 共有11条查询结果,搜索用时 15 毫秒
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L—组氨酸和色氨酸三元体系中稀土(Ⅲ),钙(Ⅱ)的化学形态 总被引:1,自引:0,他引:1
在模拟生理条件下(37℃,I=0.15mol/LNaCl),用pH电位滴定与计算机模拟计算相结合的方法研究了镨(Ⅲ)、钆(Ⅲ)、铽(Ⅲ)、镱(Ⅲ)4tkh tqd ffffyb bb t qgh (Ⅱ)、锌(Ⅱ)离子在L-组氨酸、色氨酸三元体系中的化学形态。讨论了稀土(Ⅲ)、钙(Ⅱ)和锌(Ⅱ)的物种分布特点。 相似文献
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Preparation and Characterization of Ternary Europium ComplexDoped Thin SolGel Hybrid Film
by Fluorescence Spectroscopy* 总被引:1,自引:0,他引:1
IntroductionThelow-temperatureprocessingofthesol-gelmaterialmakesitpossibletoentraporganicspecieseasilywithinarigidglassmatri... 相似文献
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用pH电位法测定了生理条件(37℃,I=0.15mol/L)和25℃,I=0.10mol/L时甘氨酰L-亮氨酸的质子化常数及其稀土配合物稳定常数。结果表明稀土可与该配体形成1:1配合物,并且配合物稳定性呈现明显“四分组效应”。讨论了钇的位置以及肽键对配合物稳定性的影响。 相似文献
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Preparation and Luminescence Properties of the Ternary Europium Complex Incorporated into an Inorganic/Polymer Matrix by a Sol-Gel Method 总被引:2,自引:0,他引:2
Fu Lianshe Zhang Hongjie Wang Shubin Meng Qingguo Yang Kuiyue Ni Jianzuan 《Journal of Sol-Gel Science and Technology》1999,15(1):49-55
Ternary europium complexes with thenoyltrifluoroacetone (TTA) and phenanthroline (phen) were incorporated into SiO2/polymer matrix by a sol-gel method. The gels exhibit the characteristic emission bands of europium ion. In addition, Eu3+ presents a longer fluorescence lifetime in gel than in the corresponding pure complex powder. Concentration effects on the luminescence intensity were investigated. The reasons that are responsible for above results are also discussed in the context. 相似文献
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Huang S Li C Cheng Z Fan Y Yang P Zhang C Yang K Lin J 《Journal of colloid and interface science》2012,376(1):312-321
Magnetic Fe(3)O(4)@mesoporous silica (MS) composites were synthesized by generating Fe(3)O(4) nanoparticles in the mesoporous silica matrix using the sol-gel method in nitrogen atmosphere. The mesoporous silica hosts include SBA-15 particles owning highly ordered p6mm mesostructure, siliceous mesostructured cellular foams (MCFs), and fiber-like mesoporous silica (FMS) with unique pore structures. The X-ray diffraction (XRD), transmission electron microscopy (TEM), and N(2) adsorption/desorption results show that Fe(3)O(4) functionalized MCFs and FMS possess suitable mesoporous structure for the adsorption of both small-molecular drug and large biomolecules. The biocompatibility tests on L929 fibroblast cells using MTT assay reveal low cytotoxicity of these systems. These Fe(3)O(4)@mesoporous silica composites show sustained release properties for aspirin in vitro. The release of the aspirin molecules from the pores of the Fe(3)O(4)@mesoporous silica composites is basically a diffusive process. Fe(3)O(4)@MCFs and Fe(3)O(4)@FMS owning larger pore size are good candidates for the adsorption of bovine serum albumin (BSA). These magnetic composites can be potential vectors for drug delivery and bioadsorption. 相似文献
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Jinping Wang Ninghai Hu Kuiyue Yang Haiyuan Zhang Chunji Niu 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(2):m52-m54
The title complex, [Gd2(C3H7NO2)4(H2O)8](ClO4)6, contains centrosymmetric dimeric [Gd2(Ala)4(H2O)8]6+ cations (Ala is α‐alanine) and perchlorate anions. The four alanine molecules act as bridging ligands linking two Gd3+ ions through their carboxylate O atoms. Each Gd3+ ion is also coordinated by four water molecules, which complete an eightfold coordination in a square‐antiprism fashion. The perchlorate anions and the methyl groups of the alanine ligands are disordered. 相似文献
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