THE CRYSTAL STRUCTURE OF RARE EARTH COMPLEX WITH AMINO ACIDS Ⅱ The Crystal Structure of Gtutamate Comptex of Erbium Perchtorate

The crystat structure of {[Er;（L—Glu）;（H;O）;]（ClO;）;·3H;O);has been studied by X-ray diffraction. The crystal is monoctinic with space group P2;and cell parameters a=19.987（3） , b=16.505（3） , c=11.040（2） , β=104.69（1）;, V=3538（1） , Z=2, Dc=2.29 g. cm;, μ=53.2 cm;, F（000）=2384. The asymmetric unit contains two complex motecules and four centre ions. Each erbium （Ⅲ） is coordinated by five oxygen donors from four different glutamates and four oxygen donors from the aqua ligand to form a nine coordination potyhedron. The mean distances of Er—0 （carboxylate） and Er—Ow are 2.439 and 2.41 respectivety. The finat R and Rw are 0.043 and 0. 058, respectivety.

Synthesis and Characterization of Rare Earth Solid Complexes with Sodium 5-Aminosalicylate

Ten new rare earth solid complexes were synthesized by the reaction of sodium 5-aminosalicyliate with rare earth chloride. The structure character, physical and chemical properties of these complexes were studied by IR, UV, ()~1H NMR spectra, TG-DTA, fluorescence, elemental analyses, molar conductance and magnetic susceptibility. The ten rare earth complexes exist in dimeric form probably and the coordination number is seven. The antibacterial activity of the ligand and six complexes was also tested against Staphylococcus aureus, Escherichia coli and Bacillus subtilis, and the effect of Yb complex at 20 mg·ml^(-1) against Staphylococcus aureus is most significant.

Study of Complexes of Lanthanum with Amino Acids by Titration Calorimeter

The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1∶1 and 1∶2 in proportion have been determined by titration calorimeter at 298.15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1∶2) is much less than that of the complexes (1∶1).

Synthesis and Characterization of Lanthanum Complexes with Amino Acid Schiff Base

Six new complexes of lanthanum with amino acid Schiff base ligands, A-F, were prepared in methanol-aqueous solution. The composition and properties of the title complexes were characterized by elemental analysis, molar conductance, infrared, electronic spectra, H-1 NMR, thermogravimetric and differential thermal analysis.

Crystal Structure of Praseodymium Complex with L－proline，Pr_2（L－Pro）_6（H_2O）_4·6ClO_4

Pr2(L-Pro)6(H2O)4]·6ClO4(Pro= proline), Mr=1641.4, monoclinic, P21,α=9. 879(3),b=21. 883(4),c=13. 393(2) A, β=91. 23(2) A, V=2895(1) A3, Z=2,Dc=1. 88g/cm3,μ( MoKα)=20. 5cm￣(-1) . F(000)=1648, R =0. 035 for 5032 observed reflections. The coordination polyhedron of Pr( Ⅲ) ion comprises six oxygen atoms from the L-Pro molecules and two from the water molecules, Each L-Pro molecule coordinates to two Pr(Ⅲ) ions through the carboxyl oxygens in a bidentate bridging mode, thus creating one-dimensional chain structure.

Crystal Structure of Praseodymium Complex with L－proline，Pr2（L－Pro）6（H2O）4·6ClO4

Pr2(L-Pro)6(H2O)4]·6ClO4(Pro= proline), Mr=1641.4, monoclinic, P21,α=9. 879(3),b=21. 883(4),c=13. 393(2) A, β=91. 23(2) A, V=2895(1) A3, Z=2,Dc=1. 88g/cm3,μ( MoKα)=20. 5cm￣(-1) . F(000)=1648, R =0. 035 for 5032 observed reflections. The coordination polyhedron of Pr( Ⅲ) ion comprises six oxygen atoms from the L-Pro molecules and two from the water molecules, Each L-Pro molecule coordinates to two Pr(Ⅲ) ions through the carboxyl oxygens in a bidentate bridging mode, thus creating one-dimensional chain structure.

Synthesis，Crystal Structure and Infrared Spectrum of Lanthanum Dinuclear Coordination Compound with Alanine：〔La2（ala）4（H2O）8〕·（ClO4）6

Lanthanum coordination compound with l-alanine[La2（ala）4（H2O）8]·（ClO4）6（ala=l-alanine） was synthesized by reaction of lanthanum perchlorate with l-alanine in aqueous solution and obtained in the form of single crystals.The X-ray crystal structure has been determined and the IR spectrum has been studied.The title compound Cl6La2C12H44O40N4,Mr=1375.2,crystallizes in the triclinic,space group P1 , with parameters: a= 11.227（3）,b=11.445（2）,c=11.014（3）,α=114.46（2）,β=114.51（2）,γ=78.62（2）°,V=1171.73,Z=1,Dc=1.95 g/cm￣3,F（000）=680,μ=22.9 cm￣-1（MoKα）.The final R=0.050,Rω=0.051.In the crystal,two lanthanum ions are coordinated by four alanine molecules via four carboxylate bridges to form a dinuclear coordination compound.Four water molecules are coordinated to each lanthanum ion. There is a symmetric centre between the two lanthanum ions.The IR spectrum of the coordination compound and the relationship between the IR spectrum and the structure have been studied.The mechanism of the configuration inversion of alanine has been proposed.

Synthesis and luminescent properties of terbium complex with 2-amino-4-chlorobenzoic acid

A novel complex [Tb（L）_2（H_2O）_3·H_2O]（where L=2-amino-4-chlorobenzoic acid） was synthesized and characterized by a series of analysis. The molecular formula of complex was confirmed by Fourier transform infrared（FT-IR） spectroscopy and thermogravimetric/differential thermogravimetric（TG-DTG） measurements. The optical properties of complex was measured by ultraviolet spectroscopy（UV） and fluorescence spectroscopy（FS）. The results indicated that Tb^（3＋） in the complex was coordinated by ligand, and the complex emitted bright yellow-green luminescence with main peak at 548.8 nm with excitation at 369.4 nm.

稀土氨基酸配合物的研究情况分析

系统分析了 1991～ 2 0 0 1年间发表的近百篇有关稀土与氨基酸配合物的文献 ,主要讨论作者国籍、刊物、机构、内容和方向等方面的问题。中国的科研人员对稀土氨基酸二元配合物的合成、性质、结构进行了系统的研究。从 90年代末开始 ,研究朝着稀土 氨基酸 过渡金属异核配合物和以氨基酸为配体的高pH值下镧系

稀土氨基酸固体络合物的合成及结构分析进展

本文综述了稀土氨基酸络合物的合成,以及应用红外、核磁、X-射线衍射、热分析等方法进行结构分析研究的进展情况。

Pr^(3+)、Eu^(3+)、Tb^(3+)与L-酪氨酸甘氨酸三元固态配合物的合成及其发光性能

在乙醇溶液中合成了三种稀土与Ｌ－酪氨酸、甘氨酸的三元固态配合物ＲＥ（Ｔｙｒ）１．５（Ｇｌｙ）４（ＣｌＯ４）３（ＲＥ＝Ｐｒ、Ｅｕ、Ｔｂ）．并通过摩尔电导、红外光谱、热谱和荧光光谱等进行了表征。铽（Ⅲ）配合物的荧光强度（Ｔｂ：５Ｄ４→７Ｆ６、７Ｆ５、７Ｆ４）比铽（Ⅲ）水合高氯酸盐增大了一个数量级．

氨基酸配合物的性质及应用

本文概述了近年来国内外对稀土与过渡金属的氨基酸配合物的研究 ,主要介绍了它们的性质及其应用等。

Eu^(3+)、Tb^(3+)、Dy^(3+)与L-脯氨酸、甘氨酸、L-丙氨酸四元固态配合物的荧光光谱研究

对在水中合成的稀土元素(Eu、T b、D y)与L-脯氨酸(L-P ro)、甘氨酸(G ly)、L-丙氨酸(L-A la)四元固态配合物的荧光光谱进行了研究。结果表明:铕、铽配合物的荧光强度均较其相应的盐高(铕高出4.5倍,铽高出9倍);四元配合物的荧光强度较三元配合物有不同程度的提高;四元配合物中,铽的荧光强度较铕的荧光强度高出近11倍。同时对上述实验结果进行了解释。

Nd^(3+)、Dy^(3+)、Yb^(3+)与L-酪氨酸甘氨酸三元固态配合物的合成与表征

在乙醇溶液中合成了三种稀土与Ｌ－酪氨酸、甘氨酸的三元固态配合物ＲＥ（Ｔｙｒ）１．５（Ｇｌｙ）４（ＣｌＯ４）３（ＲＥ＝Ｎｄ３＋、Ｄｙ３＋、Ｙｂ３＋）。并通过摩尔电导、红外光谱、热谱等进行了表征。

稀土氨基酸配合物的研究

详细总结了近年来在国家自然科学基金资助下,对稀土氮基酸配合物的研究。包括稀土盐与α-氨基酸在水中的相化学、固态配合物的表征和热化学性质研究,探讨了稀土盐与氨基酸形成配合物的某些规律。

Tb^(3+)与氨基酸混配型配合物的合成与表征

在乙醇溶液中合成了ＴｂＣｌ３，Ｔｂ（ＣｌＯ４）３与Ｌ－脯氨酸、甘氨酸形成的二种三元固态配合物Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．５Ｃｌ３·５Ｈ２Ｏ和Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．５（ＣｌＯ４）３，并通过摩尔电导、红外光谱、热分析及粉晶荧光光谱等进行了表征．荧光光谱表明，Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．５Ｃｌ３·５Ｈ２Ｏ配合物中Ｔｂ３＋的５Ｄ４→７Ｆ５跃迁谱带强度较Ｔｂ（Ｐｒｏ）０．５（Ｇｌｙ）２．

氨基酸类Schiff碱稀土配合物的合成及其抗肿瘤活性Ⅰ

以邻香兰醛和甘氨酸、Ｌ甲硫氨酸在氢氧化钾的乙醇溶液中合成Ｓｃｈｉｆ碱配体Ｌ１Ｋ，Ｌ２Ｋ（Ｌ１＝Ｃ１０Ｈ１０Ｏ４ＮＫ·Ｈ２Ｏ，Ｌ２＝Ｃ１３Ｈ１６ＮＯ４ＳＫ），将其分别作用于稀土Ｌｎ３＋，配位后生成１１个新配合物：Ｌｎ（Ｌ１）３·ｎＨ２Ｏ（Ｌｎ＝Ｌａ，ｎ＝０；Ｌｎ＝Ｐｒ，Ｎｄ，ｎ＝１；Ｌｎ＝Ｓｍ，Ｅｕ，Ｄｙ，ｎ＝２），Ｌｎ（Ｌ２）３·ｎＨ２Ｏ（Ｌｎ＝Ｌａ，ｎ＝１；Ｌｎ＝Ｐｒ，Ｓｍ，Ｅｕ，Ｄｙ，ｎ＝２），对其进行红外光谱、紫外光谱、摩尔电导、氢核磁共振谱及元素分析，推测Ｓｃｈｉｆ碱配体是以Ｏ—Ｎ—Ｏ的三齿形式与中心金属离子配位的，中心金属离子的配位数为９～１１．

稀土、2,2’-联吡啶、邻氨基苯基苯甲酸配合物合成、光谱表征及荧光性质

2,2’-联吡啶(bipy)、邻氨基苯基苯甲酸(HL)与稀土离子(RE=Tb,Eu,Sm,Nd)合成了固体稀土配合物。用元素分析、摩尔电导、紫外光谱、红外光谱、差热-热重分析和荧光光谱,对配合物的组成进行了确定和表征,并对TbL3和TbL3·bipy·3H2O的荧光性能进行了测试和讨论。TbL3·bipy·3H2O的荧光强度比TbL3的荧光强度强。

稀土氨基酸配合物应用研究综述

近几十年来,稀土氨基酸配合物及其应用研究越来越受到关注。该文对国内已报道的稀土氨基酸用途的文献进行归纳整理,进而对目前国内稀土氨基酸配合物在生物医药(抑菌)、动物饲料、微肥和荧光性能四方面的研究进展作了概括综述,为深入研究稀土氨基酸配合物用途提供参考。

稀土氨基酸配合物的合成及其应用

通过比较目前已有的一百多种稀土氨基酸配合物的合成实验,归纳了其合成方法,并初步总结了稀土氨基酸配合物在农药、肥料、茶菌剂、荧光等方面的应用。