含萘环结构的Salen-稀土配合物与DNA的相互作用研究

参照文献以2-羟基-1-萘甲醛为基础合成了含萘环结构的4种Salen-稀土配合物,研究了这4种配合物与DNA的相互作用.实验结果表明,配合物是以插入方式与DNA结合,与DNA的作用强度呈一定规律变化,原子序数越大,与DNA结合常数Kb越小.同时发现,与Salen–过渡金属配合物不同,Salen-稀土配合物在固体及非水溶剂中具有荧光,在水溶液中荧光强度减弱,但随着DNA浓度的增加,配合物荧光呈增大的趋势.     

六齿双Schiff碱稀土配合物的结构及发光

稀土有机配合物作为重要的分子功能材料,由于具有光敏性强、发光效率高等特点,在生产生活的很多领域都具有广阔的应用前景.作为以分子发光材料和分子磁性材料为研究热点的Schiff碱稀土配合物,其合成、结构及其性能的研究吸引了大量国内外化学工作者的广泛关注.结合六齿Schiff碱稀土配合物结构及其性能的最新研究进展,对其新颖结...     

Syntheses,structure and photoluminescent properties of lanthanide oxalatosulfocarboxylate coordination polymers

Hydrothermal reactions of oxalic acid(H2ox) and 2-sulfobenzoic acid(H2L) with lanthanide oxide or hydroxide yielded five lanthanide oxalatosulfocarboxylates.They have a general formula [Ln2L2(ox)(H2O)6]n[Ln = La(1),Nd(2),Eu(3),Gd(4),Tb(5)].Their structures were characterized by single crystal X-ray diffraction,powder X-ray diffraction(PXRD),infrared(IR) spectroscopy,elemental analysis(EA),and thermogravimetric analysis(TGA).1-5 are isostructural coordination polymers and feature one-dimensional(1D) chains,which are extended into 3D supramolecular frameworks through inter-chain hydrogen bonds between coordinated H2O donors and oxygen acceptors from carboxylate,sulfonate and oxalate groups.In addition,the solid-state photoluminescence properties of the Nd(2),Eu(3) and Tb(5) derivatives have been measured at room temperature.The Eu and Tb-containing coordination polymers(CPs) exhibit intense red and green luminescence emissions,respectively,with lifetimes in the order of millisecond.     

新型多氟氮超酸镧系金属盐的Lewis 酸性研究

合成了若干新的多氟氮超酸的镧系金属盐，并用 IR，     

Efficient polymerization of acrylonitrile catalyzed by divalent lanthanide complex/ sodium phenolate systems

Four divalent lanthanide complexes Sm(ArO)₂ - (THF)₄, Yb(ArO)₂(THF)₃, Eu(ArO)₂(THF)₃ (ArO = 2,6-di- tert-butyl-4-methylphenolate) and (Bu^tCp)₂Sm(THF)₂ were synthesized. Their catalytic activities on the polymerization of acrylonitrile were studied. The catalytic activities were influenced by the central metal ions involved. The catalytic activities of these divalent lanthanide complexes can be greatly increased by adding NaOC₆H₂-2,6-Bu^t₂-4-Me, NaOC₆H₄-4-Bu^t, or NaOC₁₀H₆-2-Me. The amount of additive has apparent effect on the catalytic activity, but the additive has no effect on the tacticity of the resulting polyacrylonitrile.     

Synthesis and characterization of bifunctional terbium complex-based nanoparticles

Novel bifunctional terbium complex-based nanoparticles were developed using a modified Stber method and a layer-by-layer assembly process. A magnetic core of Fe3O4 nanoparticles was coated with a silica shell to form the first layer. Then a ternary Tb3+ complex (TESPPA-Tb), which acted as a luminescent marker, was covalently bound to the silica surface by stable Si-O-Si bonds. The TESPPA monomer was synthesized by binding pyridine 2,6-dicarboxylic acid to 3-aminopropyltriethoxysilane, which was used as a ligand for coordination with the Tb3+ ions. An outer shell of silica was applied to the nanoparticles to allow for versatility with surface functionalization. The nanoparticles were characterized by X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, ultravioletvisible spectroscopy, vibration sample magnetometer, and photoluminescence spectroscopy. The bifunctional nanoparticles exhibited favorable superparamagnetic behavior and photoluminescence properties of Tb3+. These nanoparticles have potential applications in biolabeling, bioseparation, immunoassays, and pathogenic diagnosis.     

镧系金属螯合物作为CEST磁共振造影剂的研究进展

化学交换饱和转移（CEST）成像是一种基于化学位移现象的新型磁共振成像（MRI）,通过检测水质子信号变化来间接测定可交换质子的信息,而镧系金属螯合物的顺磁化学位移大,质子共振位移更远离水的信号,可实现更多的选择性饱和,提高MRI的对比性,因此非常适合用作CEST造影剂.镧系金属螯合物CEST造影剂具有进一步扩展磁共振功能和分子成像的巨大潜力,文章主要介绍了此类物质的类型及应用.     

二甘双酰氮甲基苯胺(L)稀土高氯酸盐配合物的合成及表征

在非水介质中合成了5种轻稀土高氯酸盐与配体二甘双酰氮甲基苯胺形成的固体配合物,通式为[Ln(L)2(H2O)2](ClO4)3(Ln=La,Pr,Nd,Sm或Eu).用元素分析、摩尔电导、红外光谱、核磁共振和TG-DTA分析对这些配合物进行了表征.结果表明,在这些新配合物中,配体L表现为三齿配位行为.     

用于镧系元素理化性质相关性研究的新的键参数拓扑指数

根据镧系元素的原子序数Z、价电子数N、离子半径r提出了一个新的键参数拓扑指数HZ,并将HZ、镧系元素相对分子质量Mr共同与其11种理化性质进行关联,其结果显示了满意的线性相关性.