Synthesis, Characterization, and Electrochemical Studies of Ternary Complexes of Lanthanum(III) and Cerium(III) with Some Naphthylideneamino Acids and Imidazoles
摘要:
A new series of ternary lanthanium(III) and cerium(III) complexes containing Schiff bases derived from some amino acids, viz: glycine; alanine; phenylalanine; valine and leucine with 2-hydroxy-1-naphthaldehyde as primary ligands, and 1-methylimidazole & 1,2-dimethylimidazole as secondary ligands were synthesized. The complexes were characterized on the bases of microanalyses, electrical conductance, IR & H-1 NMR spectra, thermal analysis and cyclic voltammetric data. All complexes were found to be non-electrolytes with the general formula of [ML(NO3 )Im center dot nH(2)O] (where M = La(III) or Ce(III), L = naphthylideneamino acids, Im = 1-methylimidazole or 1,2-dimethylimidazole and n = 1 or 2). The redox properties of some of the ternary complexes of La(III) and Ce(III) were examined using cyclic voltammetry in 0.1 mol dm(-3) TBAP/DMSO solutions. The reduction potentials of the investigated complexes showed a dependence upon the nature of the amino acid of the ligand. The stability of the complexes is discussed on the basis of the thermal and electrochemical data.
Preparation, properties and thermal decomposition of rare earth element complexes with 3,5-dihydroxybenzoic acid
作者:Wanda Brzyska、Alina Kula
DOI:10.1016/0040-6031(95)02773-4
日期:1996.5
Abstract The conditions of the formation of rareearthelement 3,5-dihydroxybenzoates have been studied; their quantitative composition and solubilities in water at 293 K have been determined. The IR spectra of the hydrated complexes have been recorded and their thermaldecomposition in air determined. During heating, the hydrated complexes Ln(C 7 H 5 O 4 )O 3 · n H 2 O( n = 4 for LaPr, n = 7 for
摘要 研究了稀土元素3,5-二羟基苯甲酸酯的形成条件;它们的定量组成和在 293 K 水中的溶解度已经确定。记录了水合配合物的红外光谱并测定了它们在空气中的热分解。在加热过程中,水合配合物Ln(C 7 H 5 O 4 )O 3 · n H 2 O(LaPr n = 4,Y、NdLu n = 7)一步失去结晶水,然后无水配合物直接分解为氧化物(SmGd、DyLu、Y)或中间形成Ln 2 O 2 CO 3 (La、Nd)。比较了 2,4- 和 3,5- 二羟基苯甲酸酯的热分解条件。
[EN] PROCESS FOR FORMING A PRIMARY, A SECONDARY OR A TERTIARY AMINE VIA A DIRECT AMINATION REACTION<br/>[FR] PROCÉDÉ DE FORMATION D'AMINE PRIMAIRE, SECONDAIRE OU TERTIAIRE VIA UNE RÉACTION D'AMINATION DIRECTE
申请人:RHODIA OPERATIONS
公开号:WO2014094650A1
公开(公告)日:2014-06-26
The present invention concerns a process to obtain primary, secondary or tertiary amines, via a direct amination reaction of alcohols in presence of bis(perfluoroalkylsulfonimide) acid or salts thereof catalysts, and derivatives.
Luminescence and Energy Transfer Properties of Ca<sub>2</sub>Ba<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>Cl and Ca<sub>2</sub>Ba<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>Cl:A (A = Eu<sup>2+</sup>/Ce<sup>3+</sup>/Dy<sup>3+</sup>/Tb<sup>3+</sup>) under UV and Low-Voltage Electron Beam Excitation
作者:Mengmeng Shang、Dongling Geng、Dongmei Yang、Xiaojiao Kang、Yang Zhang、Jun Lin
DOI:10.1021/ic3025759
日期:2013.3.18
the undoped Ca2Ba3(PO4)3Cl sample shows broad band photoluminescence centered near 480 nm after being reduced due to the defect structure. Eu2+ and Ce3+ ion doped Ca2Ba3(PO4)3Cl samples also show broad 5d → 4f transitions with cyan and blue colors and higher quantum yields (72% for Ca2Ba3(PO4)3Cl:0.04Eu2+; 67% for Ca2Ba3(PO4)3Cl:0.016Ce3+). For Dy3+ and Tb3+ doped Ca2Ba3(PO4)3Cl samples, they give
已经制备了具有磷灰石结构的纯Ca 2 Ba 3(PO 4)3 Cl和稀土离子(Eu 2+ / Ce 3+ / Dy 3+ / Tb 3+)掺杂的Ca 2 Ba 3(PO 4)3 Cl磷光体。通过Pechini型溶胶-凝胶法制备。利用X射线衍射(XRD)和结构优化,光致发光(PL)光谱,阴极发光(CL)光谱,绝对量子产率以及寿命来表征样品。在紫外光激发下,未掺杂的Ca 2 Ba 3(PO 4)3Cl样品由于缺陷结构而被还原后,显示出以480nm附近为中心的宽带光致发光。Eu 2+和Ce 3+离子掺杂的Ca 2 Ba 3(PO 4)3 Cl样品还显示出宽的5d→4f跃迁,具有蓝绿色和蓝色,并且具有更高的量子产率(Ca 2 Ba 3(PO 4)3 Cl为72%:0.04Eu 2+;对于Ca 2 Ba 3(PO 4)3 Cl:0.016Ce 3+)为67%。对于Dy 3+和Tb 3+掺杂的Ca
Nanocrystalline Oxalate/Carbonate Precursors of Ce and Zr and Their Decompositions to CeO<sub>2</sub>and ZrO<sub>2</sub>Nanoparticles
作者:Sonalika Vaidya、Tokeer Ahmad、Suman Agarwal、Ashok K. Ganguli
DOI:10.1111/j.1551-2916.2007.01484.x
日期:2007.3
The oxalate and carbonate precursors of cerium and zirconium have been prepared using reverse micelles as nanoreactors. Cerium oxalate precursor on thermal decomposition leads to a mixture of nanorods and nanoparticles of cerium oxide (nano-particles of 10 nm and nanorods with 7 nm diameter and 30 nm length). Cerium oxide with crystallite size of 10 nm was obtained from cerium carbonate precursor.
Different hydrated forms of the ethylenediaminetetraacetato complexes of the light rare earths
作者:J.Linn Mackey、David E. Goodney、James R. Cast
DOI:10.1016/0022-1902(71)80276-2
日期:1971.11
The reaction between the carbonates of the light rareearths and ethylenediaminetetraacetic acid (EDTA) yields different forms of the protonated 1:1 rare earth-EDTA chelates depending on the temperature. Near room temperature, multihydrates are formed (H[Ln(EDTA)]·nH2O, where n = 7 or 5), while above 45°C H[Ln(EDTA)]·mH2O is formed where m = 1 or 0. These chelates have been characterized by i.r., TGA
轻稀土的碳酸盐与乙二胺四乙酸(EDTA)之间的反应会根据温度产生不同形式的质子化1:1稀土-EDTA螯合物。在室温附近,会形成多水合物(H [Ln(EDTA)]· n H 2 O,其中n = 7或5),而在45°CH以上,会形成多水合物CH [Ln(EDTA)]· m H 2 O,其中m = 1或0。这些螯合物的特征在于ir,TGA和X射线粉末衍射。La,Ce,Pr和Nd的多水合物螯合物H [Ln(EDTA)]·7H 2 O是同构的,而H [Sm(EDTA)]·5H 2 O和H [Eu(EDTA)]·5H 2O形成不同的同构系列。红外光谱和溶解度表明这两个系列的结构不同。根据稀土的配位数,讨论了各种质子化1:1螯合物的稳定性和结构。