酞菁铕镨钕配合物的合成及表征

研究了铕酞菁、钕酞菁和镨酞菁配合物的合成、提纯与表征的方法。合成及表征结果表明，合成所得酞菁化合物通过元素分析可知，具有纯度高、红外光谱表征推测结构可靠。紫外分析表明铕酞菁、钕酞菁和镨酞菁配合物特征吸收峰有相似之处。     

酞菁钕配合物的合成与元素分析及紫外分析

研究了酞菁钕配合物的合成方法及溶解性试验，并将合成所得酞菁钕配合物通过元素分析可知其纯度高；紫外分析表明酞菁钕配合物有二聚体及单体两种形式，特征吸收峰在671nm和633nm处。     

苯磺酸钕的合成及结构表征

以苯磺酸与氧化钕为原料合成苯磺酸钕[Nd(C_6H_5SO_3)_3·2H_2O],通过热重分析、红外光谱、核磁共振光谱、扫描电镜分析对其进行了结构表征,确定了分子结构和表面形貌。苯磺酸钕含2个结晶水,热稳定性良好,表面呈分散的纤维棒状。     

烷氧基酞菁化合物的合成及性能表征

利用氰尿酸为催化剂,在温和的条件下合成出了具有烷氧基的酞菁化合物。采用红外光谱(FTIR)、核磁共振谱(~1H NMR和~(13)C NMR)、X射线衍射(XRD)、差示扫描量热法(DSC)和热重分析法(TGA)多种测试手段进行了表征。表征结果证实了在不添加催化剂下,目标化合物符合预期的分子结构。通过对其反应机理研究得到此反应不需要特殊的条件,只需在少量氰尿酸存在和适当的温度下反应即可进行。     

邻氨基苯甲酸-2,2'-联吡啶铕镧配合物的合成及表征

用氯化稀土与邻氨基苯甲酸铵和2,2′-联吡啶在水溶液中反应,合成了邻苯甲酸-2,2′-联吡啶-Eu-La固体稀土配合物,经元素分析,其化学组成式为（Eu0.5La0.5）L3L′（其中L=邻氨基苯甲酸,L′=2,2′-联吡啶）,测定了配合物的红外光谱和荧光光谱,实验结果表明,两配体与稀土离子形成了配位键;用不发光的 La∧3 离子取代EuL3L′配合物中部分Eu∧3 离子可以提高Eu∧3 离子的特征荧光发射强度。     

苯磺酸镨的合成及晶体结构表征

以苯磺酸和氧化镨为原料合成并培养得到苯磺酸镨晶体{[Pr(H₂O)₉](C₆H₅SO₃)₃}_n,通过热重分析、红外吸收光谱和X-射线单晶衍射对其进行了表征。晶体结构表明:该配合物属于正交晶系,Pnma空间群,晶胞参数为a=29.940(4),b=7.269 8(9),c=13.866 1(17),α=90o,β=90o,γ=90o,V=3 018.1(7),Z=4,F(000)=1 580,R₁=0.051 2,wR₂=0.084 2。中心金属离子以水合离子[Pr(H₂O)₉]³⁺的形式存在,苯磺酸基团仅作为抗衡阴离子,并未发生配位。     

铕-香豆素-3-羧酸配合物的合成、表征及其荧光性质研究

以香豆素-3-羧酸为配体,在超声波辅助下,合成了两个铕-香豆素-3-羧酸配合物EuL3 NO3和EuL、C1、(L=香豆素-3-羧酸根阴离子),通过IR、1HNMR、13CNMR、MS和元素分析等表征手段,对配合物的结构和组成进行了表征,并对其荧光光谱性质进行了研究.结果表明,配体的羧酸、羰基基团均与铕离子配位;配合物...     

四叔丁氧基酞菁锌的合成、表征和光谱性质

以4-硝基邻苯二甲腈为原料合成了四叔丁氧基酞菁锌,通过IR、UV-Vis和荧光光谱进行了表征,并研究合成产物的溶解性.结果表明取代酞菁锌的具有好的溶解性,不发生二聚,紫外可见光谱发生红移.     

酞菁配合物的合成、分离与表征

文章在溶液中温和的条件下合成了四硝基酞菁钴和四氨基酞菁钴配合物,该方法具有反应温度低、毒性小、产率高等特点,两种产物产率分别为60.0%和89.6%。并探索出柱层析法分离提纯四硝基酞菁钴的方法。通过紫外可见分光光度计和核磁共振仪对产物进行了表征。     

溶胶凝胶法合成镨、钕硅酸锆色料的研究

采用溶胶 -凝胶法成功地制备了镨黄、钕紫色料 ,对不同的矿化剂 ,在不同的温度合成的色料进行了XRD、XPS、分光反射率和颗粒度的测试。结果表明 :和固相合成法相比 ,采用溶胶 -凝胶法合成的试样 ,其呈色更好 ,粒度分布更窄。     

长链羧酸铕四元配合物的合成及其发光性质

合成了铕与长链羧酸、二苯甲酰甲烷、邻菲啰啉形成的四元配合物,用元素分析、红外光谱、核磁共振氢谱和紫外光谱对所合成的铕四元配合物进行了表征。由于长链羧酸的引入,铕配合物在氯仿等挥发性有机溶剂中具有良好的溶解性,这为今后与高分子基体复合创造了条件。铕配合物在342nm光波激发下,发出以铕的特征发射谱线612nm左右为主的强荧光。     

SrAl2O4:Eu2+,Dy3+,Pr3+纳米长余辉发光材料的制备与表征

以硝酸盐和尿素为基质,采用燃烧法在650℃合成了SrAl2O4:Eu2+,Dy3+,Pr3+长余辉发光粉体.研究了样品的晶体结构、晶粒大小及发光性能.结果表明:Eu2+,Dy3+,Pr3+共掺杂的磷光体没有改变铝酸锶的晶体结构,平均晶粒尺寸为41.5nm;激发和发射光谱分别为360nm和515nm的宽带谱,与SrAl2...     

Catalytic conversion of methane to synthesis gas over europium iridate,Eu2Ir2O7: Anin situ study by x-ray diffraction and mass spectrometry

The selective partial oxidation of methane over the europium iridium pyrochlore, Eu₂Ir₂O₇, has been studiedin situ by using powder X-ray diffraction and mass spectrometry. At a temperature of 873 K and 1 atmosphere pressure, with a CH₄O₂ ratio of 21 under argon dilution, high yields of synthesis gas are obtained. The pyrochlore structure of the iridate is modified during the initiation of the catalyst, giving an active solid that is shown to comprise particles of iridium metal, 30 Å in diameter, supported on europium oxide, Eu₂O₃. The modification of the pyrochlore structure was monitored by X-ray diffraction, and the product gases were continuously analysed by mass spectrometry.     

表面活性剂与钕离子对金属表面化学镀镍磷的影响

采用紫外-可见分光光度计,研究了固定工艺条件下十二烷基二甲基甜菜碱(BS-12)与琥珀酸二(2-乙基己基)酯磺酸钠(SDOS)两种表面活性剂及钕离子对金属表面化学镀镍磷的影响,得到较佳的工艺条件:SDOS与BS-12摩尔比为1:1,Ni~(2+)与H_2PO_2-摩尔比为0.3,pH=8,70℃施镀并添加适量的硫酸钕.探讨了表面活性剂的作用机制.结果表明,在固定的基础镀液中加入SDOS与BS-12混合表面活性剂,镀液会产生明显的温度效应和很强的协同效应,其镀速的增加比相应的单一表面活性剂所产生的增幅要大;加入稀土金属钕离子后,镀速下降,但镀层质量得到改善.     

Thermal, Dielectric, and Optical Properties of Neodymium Borosilicate Glasses for Thick Films

Because of their thermal, dielectric, and optical properties, new glass compositions and thick-filmed transparent dielectrics containing neodymium oxide (Nd₂O₃) were studied as a source of purer images in plasma display panels. In the present study, PbO–B₂O₃–SiO₂ and PbO–B₂O₃–SiO₂–ZnO–Al₂O₃ were used as starting glass compositions, to which up to 25 wt% of Nd₂O₃ then was added. Increased amounts of Nd₂O₃ increased the glass transition temperature and dielectric constant of the bulk glasses and decreased the coefficient of thermal expansion. The fired thick films (around 30 μm) allowed selectively visible light to penetrate and showed deep absorption properties at 585 nm that were related to an extraneous gas from neon discharge.     

一种新的铕配合物Eu(BTI)3DPPZ的合成及光致发光

合成并表征了可溶性双(硫代磷酰基)亚胺铕配合物Eu(BTI)3DPPZ,在挥发性溶剂中具有好的溶解性,TG表明它具有较高的热稳定性。在345nm的激发波长下,Eu(BTI)3DPPZ的最强发射波长在612nm,这是铕离子的特征发射谱线,归属于5D0→7F2。从发光强度来看,Eu(BTI)3DPPZ的光致发光产生了较强的红光。     

The separation of europium from a middle rare earth concentrate by combined chemical reduction,precipitation and solvent-extraction methods

The chemical reduction of pure europium(III) chloride solutions was investigated using reagents comprising reactive metals (Zn and Mg), metal amalgams (Zn-Hg, Na-Hg and Eu-Hg), metal hydride (NaBH₄) and nitrogenous reductants (N₂H₄ and NH₂OH). Using 100% excess of reducing agent and of ammonium sulphate, efficient precipitation of europium(II) sulphate was obtained with the metal amalgams (99·7–99·9%) and with zinc metal (99·8%), whereas only partial precipitation was obtained with magnesium metal (69%), and no precipitation was observed with the other reagents. Application of the method to synthetic rare earth chloride solutions containing europium 7·5, neodymium 5, samarium 35 and gadolinium 20 g dm⁻³ gave efficient precipitation of europium(II) sulphate with zinc and europium amalgams, but no selective precipitation with sodium amalgam. Reduction of an authentic middle rare earth chloride solution with zinc amalgam gave 97·5% recovery of europium(II) sulphate containing (as a percentage of the total rare earths) europium 92, samarium 3·5, neodymium 2, cerium 1, praseodymium 0·6 and gadolinium 0·5%. Conversion of the europium(II) sulphate to europium(II) chloride, followed by re-precipitation of the sulphate increased the europium content only to 96·5%, whereas replacement of the re-precipitation by solvent extraction of the trivalent rare earth impurities into solutions of commercial organophosphorus or carboxylic acids in xylene increased the europium content to > 99·98%. The zinc ions introduced into the middle rare earth mother liquor during the reduction procedure can be removed by solvent extraction into a commercial phosphine oxide (Cyanex 925), without loss of rare earth values.