Interaction of Complex of Europium and Hbbimp with DNA

TheartificialnucleasesforcleavingDNAhavebecomemoreimportant.Theenzymesystemmimicing theenzymaticsiteisthedicopperenzymehemocyanin thathasattractedmoreinterest[1～5].Somestudiesre portedthatmanynaturalenzymeswiththegoodactivi tiesalwayscontaintwoorthreeint…     

Structure of Complexes of Lanthanides with N,N''-Dimethyl-3-Oxa-Glutaramic Acid

A new stripping agent N,N-dimethyl-3-oxa-glutaramic Acid (DOGA) was used in TRPO process to simplify the TRPO process. The structures of the complexes of the DOGA with Eu(Ⅲ), Nd(Ⅲ), La(Ⅲ) were characterized with extended X-ray absorption fine structure spectroscopy (EXAFS), infrared spectra (IR) and mass spectra (MS). The molecular formula of the complexes of Eu(Ⅲ) and Nd(Ⅲ) is deduced to be M(DOGA)3, and only La(Ⅲ) can form the complex HM(DOGA)4 under condition of high consistency of the DOGA. The coordination number of Ln(Ⅲ) in the complexes is 8, and all of coordinated donor atoms are O atoms. For Eu(Ⅲ), Nd(Ⅲ), the coordination numbers of O atom in the first coordination shell is 6 and the average coordination bond lengths of Ln-O are 0.240 nm, 0.244 nm respectively, while the numbers of the second O shell are 2.4, and the average coordination bond lengths of Ln-O are 0.260 nm, 0.262 nm. For La(Ⅲ), the coordination numbers of O atom in the first coordination shell is 6 and the average coordination bond lengths of La-O are 0.258 nm, while the number of O atom in the second coordination shell is 4.4, and the average coordination bond length of La-O is 0.28 nm. The results of IR and MS show that there is no water coordinating with Ln(Ⅲ) in the complexes.     

LSC-100螯合树脂对铕的吸附性能研究

采用静态吸附方法和动态吸附方法进行LSC-100螯合树脂吸附Eu(Ⅲ)的相关研究,并且运用动力学、热力学、吸附等温模型拟合实验结果,结合FT-IR、EDS、SEM对吸附前后树脂形态结构进行了表征,研究其吸附机理.结果表明,吸附符合准二级动力学模型和Langmuir吸附等温模型;吸附过程为吸热、熵增加的过程.动态吸附实验...     

Structure of Complexes of Lanthanides with N,N′-Dimethyl-3-Oxa-Glutaramic Acid

With the development of nuclear energy, how todispose of the nuclear wastes especially high level liq uid wastes (HLLW) is the world′s subject. One strat egy for reducing the main long term hazard of radioac tive waste is to separate actinides from high level liq uid waste (HLLW) and transmute them into short lived or stable nuclides by nuclear reactions in nuclearreactors or accelerator driven transmutation systems.For this subject, many countries have brought forwardmany p…     

手性Eu(Ⅲ)配合物的合成和作为ct-DNA荧光探针的研究

通过制备拆分剂氯化(8S,9R)-(-)-N-苄基辛可尼定,拆分了外消旋联萘酚得到其两种对映异构体,以手性联萘酚为原料分别合成了配体(R)-L和(S)-L及其相应的Eu(Ⅲ)配合物(R or S)-L-Eu(NO3)3,并测定了旋光度。分别研究了配合物(R or S)-L-Eu(NO3)3与ct-DNA的作用方式及键合常数,发现配合物与小牛胸腺DNA(ct-DNA)存在插入作用,且(R)-L-Eu3+配合物与ct-DNA的键合能力较强。由于ct-DNA对(R)-L-Eu3+配合物荧光的增敏作用,选择(R)-L-Eu3+配合物作为ct-DNA的手性荧光探针,在最佳实验条件下,其线性范围为0.11×10-5～0.55×10-5 mol·L-1,0.55×10-5～7.8×10-5 mol·L-1,检出限为5.85×10-7 mol·L-1。     

Electroanalytical tools to investigate the divalent state of Eu（III） and Nd（III） ions in non-aqueous medium

The divalent state of Ln(Ⅲ) ions has attracted much interest because of their ability to serve isomorphously in many biological sys-tem of divalent Ca(II) ion. Therefore, present paper deals with the study of divalent state of Eu(Ⅲ) and Nd(Ⅲ) ions in non-aqueous medium. In present study, cyclic voltammetry and chronopotentiometry were utilized to establish the divalent state of Eu(Ⅲ) and Nd(Ⅲ) ions. The cy-clic voltammetric technique showed two-step reduction process at cathode for both Ln(Ⅲ) ions under specified experimental conditions and chronopotentiometric method also showed two different transition times (). Looking to the shape of cyclic voltammogram we calculated het-erogeneous forward rate constant (K0fh, cm/s) and diffusion coefficient (D, cm2/s) for both ions, which suggested that sweep rate had great ef-fect on the shape of cyclic voltammogram of Eu(Ⅲ) and Nd(Ⅲ) ions. The result of chronopotentiometry also suggested that stable divalent states of Eu(Ⅲ) and Nd(III) ions existed with chronopotentiogram with two distinct transition times. The diffusion coefficients (D, cm2/s) were calculated from Sand equation. The diffusion coefficients of both techniques were compared and the results suggested that the system at electrode surface was changing from being reversible to irreversible.     

Characteristics of Rare Earth Elements of Zircons from Mesozoic Volcanic Rocks in Luanping Region, Hebei

Zircon,whichisrichinU,Thanddeficientincommonlead,andhashighstabilityandthehighest envelopedtemperatureofisotopicsystem[1,2],isan idealisotopicdatingobjectinmagmaticrocks.Inthe recentyears,theLA ICP MSmethod,asanewtest ingmethodwhichhassprangupsincetheendo…     

Synthesis, structure and photoluminescent properties of a new Eu(Ⅲ) complex with 5-bromoisophthalic acid

The self-assembly of 5-bromoisophthalic acid (H2BIPA) with Eu(NO3)3·6H2O under the hydrothermal conditions gave a 3D coordination polymer, Eu2(BIPA)3(CH3CH2OH) (1), which was characterized by elemental analysis, IR and single-crystal X-ray diffraction. Complex 1 displayed an unusual three-dimensional network of a rare (4,6)-connected (48.66.8)2(44.62)2(42.84) topology, which was different from Eu2(BDC)3(H2O)2 (BDC=isophthalate), because the -Br substituent of the isophthalate resulted in the different electronic effects and the steric hindrance to change the coordination modes of carboxylate groups in the assembled process. Moreover, the luminescent properties of 1 were also investigated in the solid state.     

CaO-La2O3-B2O3-Eu2O3转光玻璃的合成及荧光性质

X射线衍射研究表明CaO-La2O3-B2O3-Eu2O3体系的玻璃化温度在1025℃附近。荧光光谱和ESR谱研究表明,在CaO-La2O3-B2O3-Eu2O3玻璃体系中存在着Eu2 和Eu3 两种价态离子。316,360,379,394,413,462和532nm锐线激发峰和592,616和650红区发射峰分别对应Eu3 的f-f激发跃迁和5D0-7FJ(J=1,2,3)跃迁发射;351nm和427nm宽带激发峰和蓝区发射分别对应Eu2 的5d-4f激发跃迁和发射。     

CaO-La2O3-B2O3-Eu2O3转光玻璃的合成及荧光性质

X射线衍射研究表明CaO-La2O3-B2O3-Eu2O3体系的玻璃化温度在1025℃附近.荧光光谱和ESR谱研究表明,在CaO-La2O3-B2O3-Eu2O3玻璃体系中存在着Eu2+和Eu3+两种价态离子. 316, 360, 379, 394, 413, 462和532nm锐线激发峰和592,616和650红区发射峰分别对应Eu3+的f-f激发跃迁和5D0-7FJ (J=1,2,3)跃迁发射;351nm和427nm宽带激发峰和蓝区发射分别对应Eu2+的5d-4f激发跃迁和发射.     

Polystyrene microsphere-based lanthanide luminescent chemosensor for detection of organophosphate pesticides

Fluorescent microspheres of polystyrene-based Eu(Ⅲ) complexes were prepared from TentaGel resin,2,6-bisbenzimidazolylpyri-dine and europium nitrate. The microspheres were characterized by FTIR spectroscopy, elemental analysis, XPS measurements and fluores-cence spectroscopy. Characteristic red emission under irradiation of365nm light from a hand-held UV lamp was observed for the micro-spheres either in a solution or solid-state.Fluorescent quenching was observed when the microspheres were exposed to a trace amount of di-ethyl chlorophosphate (DCP)in the dispersion. The material and property can be potentially used to fabricate chemosensor in the detection of organophosphates.     

Direct Spectroscopic Determination of Europium(Ⅱ) Concentration During Europium(Ⅲ) Electro-Reduction in Hydrochloric Acid Medium

UV-Vis spectroscopy was used to directly determine the concentration of Eu(Ⅱ) during electroreduction of Eu(Ⅲ) in hydrochloric acid medium. Electroreduction was carried out in a flow type electrolyzer with glassy carbon cathode at the constant potential of -800 mV vs. Ag/AgCl. The effects of oxygen and concentration of hydrochloric acid on the system were investigated. For 0.01 mol·L-1 hydrochloric acid, calibration curves for Eu(Ⅱ) absorption bands at 248 and 320 nm were constructed. Molar absorption coefficients were estimated to be 2016 and 648 L·mol-1·cm-1, respectively. The absorbance strongly decreased with decrease in pH of the solution, whereas concentration of chloride had only a negligible effect.     

Improving Thermal Stability of BaMgAl10O17:Eu Phosphor

Heterogeneous precipitation method was used to prepared surface coating on self-made BaMgAl10O17:Eu phosphor. Results illustrate that the coating film can be silicon dioxide in amorphous state with 50 nm in thickness. Photoluminescence results indicate that the coating layer presents an observable improved effect on the enhancement of thermal stability. When baked at 600 ℃ for 1 h, the luminance of coated BAM keeps at 92% higher than that of uncoated BAM by 23%. This protective effect can be attributed to the high compact degree and uniformity of this amorphous SiO2 coating film which is served as a diffusion block layer to inbreak oxygen atom, thus releases the oxidation extent of Eu2 effectively.     

Preparation,Structural Analysis and Luminescence Properties of Nanocrystalline Phosphor Gd2O3∶Eu

Nanocrystalline monoclinic and cubic Gd2O3∶Eu with different Eu3 concentration were prepared using glycine-nitrate combustion synthesis. By changing the ratio of glycine to nitrate and proper heat treatment, pure monoclinic and cubic Gd2O3∶Eu with particle size less than 40 nm can be easily formed. Under ultraviolet excitation, main emission of Eu3 (5D0→7F2) locates at 624 nm in monoclinic Gd2O3∶Eu and 611 nm in cubic sample. In excitation spectrum two broad bands corresponding to the host absorption and charge transfer state(CTS) and f-f transitions of Gd3 and Eu3 were observed and discussed. The quenching concentration of monoclinic and cubic Gd2O3∶Eu is 10% and 15%, respectively, both of which are much higher than that of bulk Gd2O3∶Eu.     

Effect of Organic Solvent and Resin on Luminescent Capability of SrAl2O4:Eu2+, Dy3+ Phosphor

Organic substance such as solvent and resin's effect on luminescent capability of SrAl2O4:Eu2 , Dy3 phosphor was studied. Some organic solvents and resins were selected for experimentation. The results indicate that those organic solvents will not have negative effect on the applied capability of SrAl2O4:Eu2 , Dy3 phosphor. Adopting the organic resins and covering method, the afterglow luminance of SrAl2O4:Eu2 , Dy3 phosphor was increased by 85.01% and 82.51%.     

Eu3+掺杂萤石矿物的发光与其晶体结构关系

对萤石矿物进行掺杂灼烧.制备了一种新型矿物发光材料萤石:Eu³⁺.根据Eu³⁺的荧光光谱与局域对称性的关系,结合空间群中等效点系的对称性分析,可以推断该体系中主要存在2类发光中心,其格位对称性分别为C_4V,和C_3V.Eu³⁺离子进入CaF₂晶格,与Ca²⁺离子不等价置换,由于电荷补偿,Eu³⁺周围常常存在间隙F_i^-的缺陷机制,间隙的存在,降低了局域对称性(由O_h降低为C_4V。或C_3V),打破了宇称选择定则,促进了Eu³⁺离子的发光.     

CaS∶Eu绿转红功能的农用研究

研究了 Ca S∶ Eu中试产品的光谱性质以及与粒度之间的关系。发现掺入 Ca S∶ Eu的塑料薄膜能调控棚内温度、提早作物成熟期和增加单产量。结果表明 :Ca S∶ Eu的绿转红功能可用于利用太阳能发展高效生态农业。     

稀土蓝绿色荧光粉的研制

用某种碱土金属离子部分置换铝酸锶中的Sr2 ,合成了发光峰值为487nm的蓝绿色荧光体Sr4-x1-x2AlxO25(M=Ca,Mg,Ba)。为提高发光体的亮度,考察了助熔剂对荧光体发光亮度的影响。Eux2Mx1