金属铕配合物的合成及其晶体结构

合成了席夫碱N-亚水杨基-2-氨基吡啶,并以此为有机配体与过渡金属铕反应,得到了相应的配合物,且在一定的条件下培养得到配合物的单晶,解析出其晶体结构,并对其进行了荧光性质研究。     

Characteristics of functionalized nano-hydroxyapatite and internalization by human epithelial cell

Hydroxyapatite is the main inorganic component of biological bone and tooth enamel, and synthetic hydroxyapatite has been widely used as biomaterials. In this study, a facile method has been developed for the fabrication of arginine-functionalized and europium-doped hydroxyapatite nanoparticles (Arg-Eu-HAP). The synthesized nanoparticles characterized by transmission electron microscopy, X-ray diffractometry, Fourier transform infrared, and Zeta potential analyzer. Its biological properties with DNA binding, cell toxicity, cell binding and intracellular distribution were tested by agarose gel electrophoresis assay, flow cytometry, and fluorescence microscope and laser scanning confocal microscope. The synthesized Arg-Eu-HAP could effectively bind DNA without any cytotoxicity and be internalized into the cytoplasm and perinuclear of human lung epithelial cells.     

Effect of an electric field on the transport of Th(IV) in the presence of Eu(III) and U(VI) through supported liquid membrane containing di‐2‐ethylhexylphosphoric acid

This paper investigates the transport of Th(IV) ions in nitric acid media through a supported liquid membrane (SLM) impregnated with di‐2‐ethylhexylphosphoric acid (HDEHP) in kerosene using an electric field. The transport was carried out in a three compartment cell fitted with microporous cellulose nitrate (SLM) and cation exchange membrane (Nafion). The effect of different parameters including nitric acid concentration in the feed solution, HDEHP concentration in the membrane, and HCl concentration were studied. The optimal conditions for Th(IV) transport were 0.1 mol dm^?3 HDEHP, 10^?3 mol dm^?3 HNO₃ in the feed solution, 1 mol dm^?3 HCl in compartment 2 and 1 mol dm^?3 HCl in compartment 3 at 25 °C. Under the optimal conditions of Th(IV) transport the recovery factor after 90 min was 0.25 without applying an electrostatic field, compared with 0.9 when the electric field was applied. The effect of electric current on the flux of Th(IV) through the membrane was also studied. The flux increased as the current density increased from 10 to 30 mA cm^?2 to reach a maximum value at 30 mA cm^?2 (8 × 10^?9 g eq cm^?2 s^?1). The transport percentages of 0.3 g dm^?3 Th(IV) in the presence of 0.1 g dm^?3 Eu(III) and 1 g dm^?3 U(VI) were 66, 84 and 15%, respectively. The determined selectivities of U(VI)–Th(IV) and Th(IV)–Eu(III) were 0.12 and 0.3, respectively, after 90 min. Therefore, the order of selectivity of this system is Eu(III) > Th(IV) > U(VI). © 2001 Society of Chemical Industry     

A study on fluorescence properties of Eu3+ ions in alkali lead tellurofluoroborate glasses

Glasses with chemical composition of (in mol.%): 26 RF-20 PbO-10 TeO2-43 H3BO3-1 EuO3 (RLTB) were prepared by conventional melt quenching method. The Judd-Ofelt intensity parameters Ω2 and Ω6 were obtained from the absorption intensities of 7F0→5D2 and 7F0→5L6 transitions, respectively. In order to overcome the problem of applicability of Judd-Ofelt analysis at room temperature due to the overlapping of the transitions originating from 7F0 and 7F1 levels of Eu3+ ion, the effect of the thermalization on the population of energy levels was taken into account. The photoluminescence spectra contained five emission bands originating from the 5D0 metastable state to 7FJ (J=0, 1, 2, 3, 4) lower lying states. The decay profiles were found to be single exponential in all the three glasses. The measured lifetimes (τmes) were in good agreement with the calculated lifetimes (τcal) obtained by using the thermally corrected Judd-Ofelt intensity parameters.     

New complexes of heteroaromatic N-oxides with europium, uranyl and zinc ions

New solid complexes of europium,uranyl and zinc ions with N-oxides of 4-chloro-2,6-dimethylpyridine,quinoline and 4-meth-oxyquinaldinic acid in presence different anions were obtained and characterized by elemental and TG analyses,IR and luminescence spectra. The compounds are crystalline,hydrated or anhydrous salts with colours typical of metal ions.Thermal studies showed that in hydrated salts lattice or coordination water molecules are present.A role of different anions in the formation of various types of the complexes is presented.     

Synthesis and luminescent properties of novel Ba2−xEuxZr2−yHfySi3O12 phosphor

A series of Eu²⁺ activated luminescent materials according to the composition of Ba_2−xEu_xZr_2−yHf_ySi₃O₁₂ were synthesized using a high temperature solid-state reaction method starting from metal oxides and carbonates. Single phase powders were obtained using two annealing steps and boric acid as a flux. Firstly, starting materials were sintered at 1450 °C for 5 h under CO atmosphere and subsequently annealed at 1200 °C for 5 h under N₂/H₂ (95%/5%) gas flow. All samples were characterized by powder X-ray diffraction (XRD) analysis, thermal quenching (TQ), fluorescence lifetime measurements and photoluminescence (PL) techniques. Moreover, emission colour points, luminous efficacies and quantum efficiencies (QE) were calculated and discussed as a function of Eu²⁺ concentration and Zr/Hf ratio of the host lattice.     

BSPDA-Eu配合物的合成及其时间分辨荧光性质

制备了一种含巯基的时间分辨荧光配体BSPDA（4，7-二巯基苯基1，10-菲罗啉-2,9-二羧酸）及其铕（Ⅲ）配合物，研究了铕配合物的荧光性质．结果表明，该巯基配体可与铕（Ⅲ）形成1：1和2：1具有时间分辨荧光特性的配合物，能发射出铕的特征谱线，其1：1与2：1的配合物具有数百微秒以上的荧光寿命，在相关的发射特征峰位处后者的寿命稍长于前者．这表明，在后者铕配合物中存在更强的配位作用和更有效配体对中心离子（即BSPDA到Eu^3＋）能量传递．     

Synthesis and Properties of Ternary Europium Complexes with Aromatic Carboxylic Acid and ,Nitrogen-Containing Heterocyclic Ligand

Synthesis and Properties of Ternary Europium Complexes with Aromatic Carboxylic Acid and Nitrogen-Containing Heterocyclic Ligand     

对苯基苯甲酸铕、铽配合物的合成、表征及荧光性能研究

分别合成了以对苯基苯甲酸为配体,铕、铽及掺杂铕、铽为中心的固态配合物。经元素分析、摩尔电导及差热-热重分析,推测其组成分别为:铕配合物:EuL3.3H2O、Eu0.5La0.5L3.3H2O、Eu0.5Y0.5L3.3H2O;铽配合物:TbL3.2H2O、Tb0.5La0.5L3.2H2O、Tb0.5Y0.5L3.3H2O(L=■-■-COO-。红外光谱、紫外光谱及核磁共振氢谱分析表明,对苯基苯甲酸的羧基氧原子与稀土离子配位。配合物的荧光光谱测定表明,铕系列和铽系列配合物都可发出其特征荧光,铕异核稀土配合物的荧光强度与相同配体的铕配合物相比,均有不同程度提高。